ColumnFamilyOptionsInterface

All Known Implementing Classes:

ColumnFamilyOptions, Options
```
public interface ColumnFamilyOptionsInterface
```

Field Summary

Fields
Modifier and Type	Field and Description
`static long`	`DEFAULT_COMPACTION_MEMTABLE_MEMORY_BUDGET` Default memtable memory budget used with the following methods: `optimizeLevelStyleCompaction()` `optimizeUniversalStyleCompaction()`

Method Summary

Methods
Modifier and Type	Method and Description
`long`	`arenaBlockSize()` The size of one block in arena memory allocation.
`int`	`bloomLocality()` Control locality of bloom filter probes to improve cache miss rate.
`CompactionStyle`	`compactionStyle()` Compaction style for DB.
`java.util.List<CompressionType>`	`compressionPerLevel()` Return the currently set `CompressionType` per instances.
`CompressionType`	`compressionType()` Compress blocks using the specified compression algorithm.
`boolean`	`disableAutoCompactions()` Disable automatic compactions.
`int`	`expandedCompactionFactor()` Maximum number of bytes in all compacted files.
`boolean`	`filterDeletes()` Use KeyMayExist API to filter deletes when this is true.
`double`	`hardRateLimit()` Puts are delayed 1ms at a time when any level has a compaction score that exceeds hard_rate_limit.
`long`	`inplaceUpdateNumLocks()` Number of locks used for inplace update Default: 10000, if inplace_update_support = true, else 0.
`boolean`	`inplaceUpdateSupport()` Allows thread-safe inplace updates.
`boolean`	`levelCompactionDynamicLevelBytes()` Return if `LevelCompactionDynamicLevelBytes` is enabled.
`int`	`levelZeroFileNumCompactionTrigger()` The number of files in level 0 to trigger compaction from level-0 to level-1.
`int`	`levelZeroSlowdownWritesTrigger()` Soft limit on the number of level-0 files.
`int`	`levelZeroStopWritesTrigger()` Maximum number of level-0 files.
`long`	`maxBytesForLevelBase()` The upper-bound of the total size of level-1 files in bytes.
`int`	`maxBytesForLevelMultiplier()` The ratio between the total size of level-(L+1) files and the total size of level-L files for all L.
`int`	`maxGrandparentOverlapFactor()` Control maximum bytes of overlaps in grandparent (i.e., level+2) before we stop building a single file in a level->level+1 compaction.
`int`	`maxMemCompactionLevel()` Deprecated.
`long`	`maxSequentialSkipInIterations()` An iteration->Next() sequentially skips over keys with the same user-key unless this option is set.
`long`	`maxSuccessiveMerges()` Maximum number of successive merge operations on a key in the memtable.
`long`	`maxTableFilesSizeFIFO()` FIFO compaction option.
`int`	`maxWriteBufferNumber()` Returns maximum number of write buffers.
`java.lang.String`	`memTableFactoryName()` Returns the name of the current mem table representation.
`int`	`memtablePrefixBloomBits()` Returns the number of bits used in the prefix bloom filter.
`int`	`memtablePrefixBloomProbes()` The number of hash probes per key used in the mem-table.
`int`	`minPartialMergeOperands()` The number of partial merge operands to accumulate before partial merge will be performed.
`int`	`minWriteBufferNumberToMerge()` The minimum number of write buffers that will be merged together before writing to storage.
`int`	`numLevels()` If level-styled compaction is used, then this number determines the total number of levels.
`boolean`	`optimizeFiltersForHits()` Returns the current state of the `optimize_filters_for_hits` setting.
`java.lang.Object`	`optimizeForPointLookup(long blockCacheSizeMb)` Use this if you don't need to keep the data sorted, i.e.
`java.lang.Object`	`optimizeLevelStyleCompaction()` Default values for some parameters in ColumnFamilyOptions are not optimized for heavy workloads and big datasets, which means you might observe write stalls under some conditions.
`java.lang.Object`	`optimizeLevelStyleCompaction(long memtableMemoryBudget)` Default values for some parameters in ColumnFamilyOptions are not optimized for heavy workloads and big datasets, which means you might observe write stalls under some conditions.
`java.lang.Object`	`optimizeUniversalStyleCompaction()` Default values for some parameters in ColumnFamilyOptions are not optimized for heavy workloads and big datasets, which means you might observe write stalls under some conditions.
`java.lang.Object`	`optimizeUniversalStyleCompaction(long memtableMemoryBudget)` Default values for some parameters in ColumnFamilyOptions are not optimized for heavy workloads and big datasets, which means you might observe write stalls under some conditions.
`boolean`	`purgeRedundantKvsWhileFlush()` Purge duplicate/deleted keys when a memtable is flushed to storage.
`int`	`rateLimitDelayMaxMilliseconds()` The maximum time interval a put will be stalled when hard_rate_limit is enforced.
`java.lang.Object`	`setArenaBlockSize(long arenaBlockSize)` The size of one block in arena memory allocation.
`java.lang.Object`	`setBloomLocality(int bloomLocality)` Control locality of bloom filter probes to improve cache miss rate.
`java.lang.Object`	`setCompactionStyle(CompactionStyle compactionStyle)` Set compaction style for DB.
`java.lang.Object`	`setComparator(AbstractComparator<? extends org.rocksdb.AbstractSlice<?>> comparator)` Use the specified comparator for key ordering.
`java.lang.Object`	`setComparator(BuiltinComparator builtinComparator)` Set `BuiltinComparator` to be used with RocksDB.
`java.lang.Object`	`setCompressionPerLevel(java.util.List<CompressionType> compressionLevels)` Different levels can have different compression policies.
`java.lang.Object`	`setCompressionType(CompressionType compressionType)` Compress blocks using the specified compression algorithm.
`java.lang.Object`	`setDisableAutoCompactions(boolean disableAutoCompactions)` Disable automatic compactions.
`java.lang.Object`	`setExpandedCompactionFactor(int expandedCompactionFactor)` Maximum number of bytes in all compacted files.
`java.lang.Object`	`setFilterDeletes(boolean filterDeletes)` Use KeyMayExist API to filter deletes when this is true.
`java.lang.Object`	`setHardRateLimit(double hardRateLimit)` Puts are delayed 1ms at a time when any level has a compaction score that exceeds hard_rate_limit.
`java.lang.Object`	`setInplaceUpdateNumLocks(long inplaceUpdateNumLocks)` Number of locks used for inplace update Default: 10000, if inplace_update_support = true, else 0.
`java.lang.Object`	`setInplaceUpdateSupport(boolean inplaceUpdateSupport)` Allows thread-safe inplace updates.
`java.lang.Object`	`setLevelCompactionDynamicLevelBytes(boolean enableLevelCompactionDynamicLevelBytes)` If `true`, RocksDB will pick target size of each level dynamically.
`java.lang.Object`	`setLevelZeroFileNumCompactionTrigger(int numFiles)` Number of files to trigger level-0 compaction.
`java.lang.Object`	`setLevelZeroSlowdownWritesTrigger(int numFiles)` Soft limit on number of level-0 files.
`java.lang.Object`	`setLevelZeroStopWritesTrigger(int numFiles)` Maximum number of level-0 files.
`java.lang.Object`	`setMaxBytesForLevelBase(long maxBytesForLevelBase)` The upper-bound of the total size of level-1 files in bytes.
`java.lang.Object`	`setMaxBytesForLevelMultiplier(int multiplier)` The ratio between the total size of level-(L+1) files and the total size of level-L files for all L.
`java.lang.Object`	`setMaxGrandparentOverlapFactor(int maxGrandparentOverlapFactor)` Control maximum bytes of overlaps in grandparent (i.e., level+2) before we stop building a single file in a level->level+1 compaction.
`java.lang.Object`	`setMaxMemCompactionLevel(int maxMemCompactionLevel)` Deprecated.
`java.lang.Object`	`setMaxSequentialSkipInIterations(long maxSequentialSkipInIterations)` An iteration->Next() sequentially skips over keys with the same user-key unless this option is set.
`java.lang.Object`	`setMaxSuccessiveMerges(long maxSuccessiveMerges)` Maximum number of successive merge operations on a key in the memtable.
`java.lang.Object`	`setMaxTableFilesSizeFIFO(long maxTableFilesSize)` FIFO compaction option.
`java.lang.Object`	`setMaxWriteBufferNumber(int maxWriteBufferNumber)` The maximum number of write buffers that are built up in memory.
`java.lang.Object`	`setMemTableConfig(MemTableConfig config)` Set the config for mem-table.
`java.lang.Object`	`setMemtablePrefixBloomBits(int memtablePrefixBloomBits)` Sets the number of bits used in the prefix bloom filter.
`java.lang.Object`	`setMemtablePrefixBloomProbes(int memtablePrefixBloomProbes)` The number of hash probes per key used in the mem-table.
`java.lang.Object`	`setMergeOperator(MergeOperator mergeOperator)` Set the merge operator to be used for merging two different key/value pairs that share the same key.
`java.lang.Object`	`setMergeOperatorName(java.lang.String name)` Set the merge operator to be used for merging two merge operands of the same key.
`java.lang.Object`	`setMinPartialMergeOperands(int minPartialMergeOperands)` The number of partial merge operands to accumulate before partial merge will be performed.
`java.lang.Object`	`setMinWriteBufferNumberToMerge(int minWriteBufferNumberToMerge)` The minimum number of write buffers that will be merged together before writing to storage.
`java.lang.Object`	`setNumLevels(int numLevels)` Set the number of levels for this database If level-styled compaction is used, then this number determines the total number of levels.
`java.lang.Object`	`setOptimizeFiltersForHits(boolean optimizeFiltersForHits)` This flag specifies that the implementation should optimize the filters mainly for cases where keys are found rather than also optimize for keys missed.
`java.lang.Object`	`setPurgeRedundantKvsWhileFlush(boolean purgeRedundantKvsWhileFlush)` Purge duplicate/deleted keys when a memtable is flushed to storage.
`java.lang.Object`	`setRateLimitDelayMaxMilliseconds(int rateLimitDelayMaxMilliseconds)` The maximum time interval a put will be stalled when hard_rate_limit is enforced.
`java.lang.Object`	`setSoftRateLimit(double softRateLimit)` Puts are delayed 0-1 ms when any level has a compaction score that exceeds soft_rate_limit.
`java.lang.Object`	`setSourceCompactionFactor(int sourceCompactionFactor)` Maximum number of bytes in all source files to be compacted in a single compaction run.
`java.lang.Object`	`setTableFormatConfig(TableFormatConfig config)` Set the config for table format.
`java.lang.Object`	`setTargetFileSizeBase(long targetFileSizeBase)` The target file size for compaction.
`java.lang.Object`	`setTargetFileSizeMultiplier(int multiplier)` targetFileSizeMultiplier defines the size ratio between a level-L file and level-(L+1) file.
`java.lang.Object`	`setVerifyChecksumsInCompaction(boolean verifyChecksumsInCompaction)` If true, compaction will verify checksum on every read that happens as part of compaction Default: true
`java.lang.Object`	`setWriteBufferSize(long writeBufferSize)` Amount of data to build up in memory (backed by an unsorted log on disk) before converting to a sorted on-disk file.
`double`	`softRateLimit()` Puts are delayed 0-1 ms when any level has a compaction score that exceeds soft_rate_limit.
`int`	`sourceCompactionFactor()` Maximum number of bytes in all source files to be compacted in a single compaction run.
`java.lang.String`	`tableFactoryName()`
`long`	`targetFileSizeBase()` The target file size for compaction.
`int`	`targetFileSizeMultiplier()` targetFileSizeMultiplier defines the size ratio between a level-(L+1) file and level-L file.
`java.lang.Object`	`useCappedPrefixExtractor(int n)` Same as fixed length prefix extractor, except that when slice is shorter than the fixed length, it will use the full key.
`java.lang.Object`	`useFixedLengthPrefixExtractor(int n)` This prefix-extractor uses the first n bytes of a key as its prefix.
`boolean`	`verifyChecksumsInCompaction()` If true, compaction will verify checksum on every read that happens as part of compaction Default: true
`long`	`writeBufferSize()` Return size of write buffer size.

- Field Detail
  - DEFAULT_COMPACTION_MEMTABLE_MEMORY_BUDGET
```
static final long DEFAULT_COMPACTION_MEMTABLE_MEMORY_BUDGET
```
    Default memtable memory budget used with the following methods:
    1. optimizeLevelStyleCompaction()
    2. optimizeUniversalStyleCompaction()
    See Also:
    Constant Field Values
- Method Detail
  - optimizeForPointLookup
```
java.lang.Object optimizeForPointLookup(long blockCacheSizeMb)
```
    Use this if you don't need to keep the data sorted, i.e. you'll never use an iterator, only Put() and Get() API calls
    
    Parameters:
    blockCacheSizeMb - Block cache size in MB
    
    Returns:
    the instance of the current Object.
  - optimizeLevelStyleCompaction
```
java.lang.Object optimizeLevelStyleCompaction()
```
    Default values for some parameters in ColumnFamilyOptions are not optimized for heavy workloads and big datasets, which means you might observe write stalls under some conditions. As a starting point for tuning RocksDB options, use the following for level style compaction.
    
    Make sure to also call IncreaseParallelism(), which will provide the biggest performance gains.
    
    Note: we might use more memory than memtable_memory_budget during high write rate period
    
    Returns:
    the instance of the current Object.
  - optimizeLevelStyleCompaction
```
java.lang.Object optimizeLevelStyleCompaction(long memtableMemoryBudget)
```
    Default values for some parameters in ColumnFamilyOptions are not optimized for heavy workloads and big datasets, which means you might observe write stalls under some conditions. As a starting point for tuning RocksDB options, use the following for level style compaction.
    
    Make sure to also call IncreaseParallelism(), which will provide the biggest performance gains.
    
    Note: we might use more memory than memtable_memory_budget during high write rate period
    
    Parameters:
    memtableMemoryBudget - memory budget in bytes
    
    Returns:
    the instance of the current Object.
  - optimizeUniversalStyleCompaction
```
java.lang.Object optimizeUniversalStyleCompaction()
```
    Default values for some parameters in ColumnFamilyOptions are not optimized for heavy workloads and big datasets, which means you might observe write stalls under some conditions. As a starting point for tuning RocksDB options, use the following for universal style compaction.
    
    Universal style compaction is focused on reducing Write Amplification Factor for big data sets, but increases Space Amplification.
    
    Make sure to also call IncreaseParallelism(), which will provide the biggest performance gains.
    
    Note: we might use more memory than memtable_memory_budget during high write rate period
    
    Returns:
    the instance of the current Object.
  - optimizeUniversalStyleCompaction
```
java.lang.Object optimizeUniversalStyleCompaction(long memtableMemoryBudget)
```
    Default values for some parameters in ColumnFamilyOptions are not optimized for heavy workloads and big datasets, which means you might observe write stalls under some conditions. As a starting point for tuning RocksDB options, use the following for universal style compaction.
    
    Universal style compaction is focused on reducing Write Amplification Factor for big data sets, but increases Space Amplification.
    
    Make sure to also call IncreaseParallelism(), which will provide the biggest performance gains.
    
    Note: we might use more memory than memtable_memory_budget during high write rate period
    
    Parameters:
    memtableMemoryBudget - memory budget in bytes
    
    Returns:
    the instance of the current Object.
  - setComparator
```
java.lang.Object setComparator(BuiltinComparator builtinComparator)
```
    Set BuiltinComparator to be used with RocksDB. Note: Comparator can be set once upon database creation. Default: BytewiseComparator.
    
    Parameters:
    builtinComparator - a BuiltinComparator type.
    
    Returns:
    the instance of the current Object.
  - setComparator
```
java.lang.Object setComparator(AbstractComparator<? extends org.rocksdb.AbstractSlice<?>> comparator)
```
    Use the specified comparator for key ordering. Comparator should not be disposed before options instances using this comparator is disposed. If dispose() function is not called, then comparator object will be GC'd automatically. Comparator instance can be re-used in multiple options instances.
    
    Parameters:
    comparator - java instance.
    
    Returns:
    the instance of the current Object.
  - setMergeOperatorName
```
java.lang.Object setMergeOperatorName(java.lang.String name)
```
    Set the merge operator to be used for merging two merge operands of the same key. The merge function is invoked during compaction and at lookup time, if multiple key/value pairs belonging to the same key are found in the database.
    
    Parameters:
    name - the name of the merge function, as defined by the MergeOperators factory (see utilities/MergeOperators.h) The merge function is specified by name and must be one of the standard merge operators provided by RocksDB. The available operators are "put", "uint64add", "stringappend" and "stringappendtest".
    
    Returns:
    the instance of the current Object.
  - setMergeOperator
```
java.lang.Object setMergeOperator(MergeOperator mergeOperator)
```
    Set the merge operator to be used for merging two different key/value pairs that share the same key. The merge function is invoked during compaction and at lookup time, if multiple key/value pairs belonging to the same key are found in the database.
    
    Parameters:
    mergeOperator - MergeOperator instance.
    
    Returns:
    the instance of the current Object.
  - setWriteBufferSize
```
java.lang.Object setWriteBufferSize(long writeBufferSize)
```
    Amount of data to build up in memory (backed by an unsorted log on disk) before converting to a sorted on-disk file. Larger values increase performance, especially during bulk loads. Up to max_write_buffer_number write buffers may be held in memory at the same time, so you may wish to adjust this parameter to control memory usage. Also, a larger write buffer will result in a longer recovery time the next time the database is opened. Default: 4MB
    
    Parameters:
    writeBufferSize - the size of write buffer.
    
    Returns:
    the instance of the current Object.
    
    Throws:
    
    java.lang.IllegalArgumentException - thrown on 32-Bit platforms while overflowing the underlying platform specific value.
  - writeBufferSize
```
long writeBufferSize()
```
    Return size of write buffer size.
    
    Returns:
    size of write buffer.
    See Also:
    setWriteBufferSize(long)
  - setMaxWriteBufferNumber
```
java.lang.Object setMaxWriteBufferNumber(int maxWriteBufferNumber)
```
    The maximum number of write buffers that are built up in memory. The default is 2, so that when 1 write buffer is being flushed to storage, new writes can continue to the other write buffer. Default: 2
    
    Parameters:
    maxWriteBufferNumber - maximum number of write buffers.
    
    Returns:
    the instance of the current Object.
  - maxWriteBufferNumber
```
int maxWriteBufferNumber()
```
    Returns maximum number of write buffers.
    
    Returns:
    maximum number of write buffers.
    See Also:
    setMaxWriteBufferNumber(int)
  - setMinWriteBufferNumberToMerge
```
java.lang.Object setMinWriteBufferNumberToMerge(int minWriteBufferNumberToMerge)
```
    The minimum number of write buffers that will be merged together before writing to storage. If set to 1, then all write buffers are flushed to L0 as individual files and this increases read amplification because a get request has to check in all of these files. Also, an in-memory merge may result in writing lesser data to storage if there are duplicate records in each of these individual write buffers. Default: 1
    
    Parameters:
    minWriteBufferNumberToMerge - the minimum number of write buffers that will be merged together.
    
    Returns:
    the reference to the current option.
  - minWriteBufferNumberToMerge
```
int minWriteBufferNumberToMerge()
```
    The minimum number of write buffers that will be merged together before writing to storage. If set to 1, then all write buffers are flushed to L0 as individual files and this increases read amplification because a get request has to check in all of these files. Also, an in-memory merge may result in writing lesser data to storage if there are duplicate records in each of these individual write buffers. Default: 1
    
    Returns:
    the minimum number of write buffers that will be merged together.
  - useFixedLengthPrefixExtractor
```
java.lang.Object useFixedLengthPrefixExtractor(int n)
```
    This prefix-extractor uses the first n bytes of a key as its prefix. In some hash-based memtable representation such as HashLinkedList and HashSkipList, prefixes are used to partition the keys into several buckets. Prefix extractor is used to specify how to extract the prefix given a key.
    
    Parameters:
    n - use the first n bytes of a key as its prefix.
    
    Returns:
    the reference to the current option.
  - useCappedPrefixExtractor
```
java.lang.Object useCappedPrefixExtractor(int n)
```
    Same as fixed length prefix extractor, except that when slice is shorter than the fixed length, it will use the full key.
    
    Parameters:
    n - use the first n bytes of a key as its prefix.
    
    Returns:
    the reference to the current option.
  - setCompressionType
```
java.lang.Object setCompressionType(CompressionType compressionType)
```
    Compress blocks using the specified compression algorithm. This parameter can be changed dynamically. Default: SNAPPY_COMPRESSION, which gives lightweight but fast compression.
    
    Parameters:
    compressionType - Compression Type.
    
    Returns:
    the reference to the current option.
  - compressionType
```
CompressionType compressionType()
```
    Compress blocks using the specified compression algorithm. This parameter can be changed dynamically. Default: SNAPPY_COMPRESSION, which gives lightweight but fast compression.
    
    Returns:
    Compression type.
  - setCompressionPerLevel
```
java.lang.Object setCompressionPerLevel(java.util.List<CompressionType> compressionLevels)
```
    Different levels can have different compression policies. There are cases where most lower levels would like to use quick compression algorithms while the higher levels (which have more data) use compression algorithms that have better compression but could be slower. This array, if non-empty, should have an entry for each level of the database; these override the value specified in the previous field 'compression'.
    NOTICE
    If level_compaction_dynamic_level_bytes=true, compression_per_level[0] still determines L0, but other elements of the array are based on base level (the level L0 files are merged to), and may not match the level users see from info log for metadata.
    
    If L0 files are merged to level - n, then, for i>0, compression_per_level[i] determines compaction type for level n+i-1.
    Example
    For example, if we have 5 levels, and we determine to merge L0 data to L4 (which means L1..L3 will be empty), then the new files go to L4 uses compression type compression_per_level[1].
    
    If now L0 is merged to L2. Data goes to L2 will be compressed according to compression_per_level[1], L3 using compression_per_level[2]and L4 using compression_per_level[3]. Compaction for each level can change when data grows.
    
    Default: empty
    
    Parameters:
    compressionLevels - list of CompressionType instances.
    
    Returns:
    the reference to the current option.
  - compressionPerLevel
```
java.util.List<CompressionType> compressionPerLevel()
```
    Return the currently set CompressionType per instances.
    
    See: setCompressionPerLevel(java.util.List)
    
    Returns:
    list of CompressionType instances.
  - setNumLevels
```
java.lang.Object setNumLevels(int numLevels)
```
    Set the number of levels for this database If level-styled compaction is used, then this number determines the total number of levels.
    
    Parameters:
    numLevels - the number of levels.
    
    Returns:
    the reference to the current option.
  - numLevels
```
int numLevels()
```
    If level-styled compaction is used, then this number determines the total number of levels.
    
    Returns:
    the number of levels.
  - setLevelZeroFileNumCompactionTrigger
```
java.lang.Object setLevelZeroFileNumCompactionTrigger(int numFiles)
```
    Number of files to trigger level-0 compaction. A value < 0 means that level-0 compaction will not be triggered by number of files at all. Default: 4
    
    Parameters:
    numFiles - the number of files in level-0 to trigger compaction.
    
    Returns:
    the reference to the current option.
  - levelZeroFileNumCompactionTrigger
```
int levelZeroFileNumCompactionTrigger()
```
    The number of files in level 0 to trigger compaction from level-0 to level-1. A value < 0 means that level-0 compaction will not be triggered by number of files at all. Default: 4
    
    Returns:
    the number of files in level 0 to trigger compaction.
  - setLevelZeroSlowdownWritesTrigger
```
java.lang.Object setLevelZeroSlowdownWritesTrigger(int numFiles)
```
    Soft limit on number of level-0 files. We start slowing down writes at this point. A value < 0 means that no writing slow down will be triggered by number of files in level-0.
    
    Parameters:
    numFiles - soft limit on number of level-0 files.
    
    Returns:
    the reference to the current option.
  - levelZeroSlowdownWritesTrigger
```
int levelZeroSlowdownWritesTrigger()
```
    Soft limit on the number of level-0 files. We start slowing down writes at this point. A value < 0 means that no writing slow down will be triggered by number of files in level-0.
    
    Returns:
    the soft limit on the number of level-0 files.
  - setLevelZeroStopWritesTrigger
```
java.lang.Object setLevelZeroStopWritesTrigger(int numFiles)
```
    Maximum number of level-0 files. We stop writes at this point.
    
    Parameters:
    numFiles - the hard limit of the number of level-0 files.
    
    Returns:
    the reference to the current option.
  - levelZeroStopWritesTrigger
```
int levelZeroStopWritesTrigger()
```
    Maximum number of level-0 files. We stop writes at this point.
    
    Returns:
    the hard limit of the number of level-0 file.
  - setMaxMemCompactionLevel
```
@Deprecated
java.lang.Object setMaxMemCompactionLevel(int maxMemCompactionLevel)
```
    Deprecated.
    
    This does nothing anymore. Deprecated.
    
    Parameters:
    maxMemCompactionLevel - Unused.
    
    Returns:
    the reference to the current option.
  - maxMemCompactionLevel
```
@Deprecated
int maxMemCompactionLevel()
```
    Deprecated.
    
    This does nothing anymore. Deprecated.
    
    Returns:
    Always returns 0.
  - setTargetFileSizeBase
```
java.lang.Object setTargetFileSizeBase(long targetFileSizeBase)
```
    The target file size for compaction. This targetFileSizeBase determines a level-1 file size. Target file size for level L can be calculated by targetFileSizeBase * (targetFileSizeMultiplier ^ (L-1)) For example, if targetFileSizeBase is 2MB and target_file_size_multiplier is 10, then each file on level-1 will be 2MB, and each file on level 2 will be 20MB, and each file on level-3 will be 200MB. by default targetFileSizeBase is 2MB.
    
    Parameters:
    targetFileSizeBase - the target size of a level-0 file.
    
    Returns:
    the reference to the current option.
    See Also:
    setTargetFileSizeMultiplier(int)
  - targetFileSizeBase
```
long targetFileSizeBase()
```
    The target file size for compaction. This targetFileSizeBase determines a level-1 file size. Target file size for level L can be calculated by targetFileSizeBase * (targetFileSizeMultiplier ^ (L-1)) For example, if targetFileSizeBase is 2MB and target_file_size_multiplier is 10, then each file on level-1 will be 2MB, and each file on level 2 will be 20MB, and each file on level-3 will be 200MB. by default targetFileSizeBase is 2MB.
    
    Returns:
    the target size of a level-0 file.
    See Also:
    targetFileSizeMultiplier()
  - setTargetFileSizeMultiplier
```
java.lang.Object setTargetFileSizeMultiplier(int multiplier)
```
    targetFileSizeMultiplier defines the size ratio between a level-L file and level-(L+1) file. By default target_file_size_multiplier is 1, meaning files in different levels have the same target.
    
    Parameters:
    multiplier - the size ratio between a level-(L+1) file and level-L file.
    
    Returns:
    the reference to the current option.
  - targetFileSizeMultiplier
```
int targetFileSizeMultiplier()
```
    targetFileSizeMultiplier defines the size ratio between a level-(L+1) file and level-L file. By default targetFileSizeMultiplier is 1, meaning files in different levels have the same target.
    
    Returns:
    the size ratio between a level-(L+1) file and level-L file.
  - setMaxBytesForLevelBase
```
java.lang.Object setMaxBytesForLevelBase(long maxBytesForLevelBase)
```
    The upper-bound of the total size of level-1 files in bytes. Maximum number of bytes for level L can be calculated as (maxBytesForLevelBase) * (maxBytesForLevelMultiplier ^ (L-1)) For example, if maxBytesForLevelBase is 20MB, and if max_bytes_for_level_multiplier is 10, total data size for level-1 will be 20MB, total file size for level-2 will be 200MB, and total file size for level-3 will be 2GB. by default 'maxBytesForLevelBase' is 10MB.
    
    Parameters:
    maxBytesForLevelBase - maximum bytes for level base.
    
    Returns:
    the reference to the current option.
    See Also:
    setMaxBytesForLevelMultiplier(int)
  - maxBytesForLevelBase
```
long maxBytesForLevelBase()
```
    The upper-bound of the total size of level-1 files in bytes. Maximum number of bytes for level L can be calculated as (maxBytesForLevelBase) * (maxBytesForLevelMultiplier ^ (L-1)) For example, if maxBytesForLevelBase is 20MB, and if max_bytes_for_level_multiplier is 10, total data size for level-1 will be 20MB, total file size for level-2 will be 200MB, and total file size for level-3 will be 2GB. by default 'maxBytesForLevelBase' is 10MB.
    
    Returns:
    the upper-bound of the total size of level-1 files in bytes.
    See Also:
    maxBytesForLevelMultiplier()
  - setLevelCompactionDynamicLevelBytes
```
java.lang.Object setLevelCompactionDynamicLevelBytes(boolean enableLevelCompactionDynamicLevelBytes)
```
    If true, RocksDB will pick target size of each level dynamically. We will pick a base level b >= 1. L0 will be directly merged into level b, instead of always into level 1. Level 1 to b-1 need to be empty. We try to pick b and its target size so that
    1. target size is in the range of (max_bytes_for_level_base / max_bytes_for_level_multiplier, max_bytes_for_level_base]
    2. target size of the last level (level num_levels-1) equals to extra size of the level.
    At the same time max_bytes_for_level_multiplier and max_bytes_for_level_multiplier_additional are still satisfied.
    
    With this option on, from an empty DB, we make last level the base level, which means merging L0 data into the last level, until it exceeds max_bytes_for_level_base. And then we make the second last level to be base level, to start to merge L0 data to second last level, with its target size to be 1/max_bytes_for_level_multiplier of the last levels extra size. After the data accumulates more so that we need to move the base level to the third last one, and so on.
    
    Example
    
    For example, assume max_bytes_for_level_multiplier=10, num_levels=6, and max_bytes_for_level_base=10MB.
    
    Target sizes of level 1 to 5 starts with:
    [- - - - 10MB]
    with base level is level. Target sizes of level 1 to 4 are not applicable because they will not be used. Until the size of Level 5 grows to more than 10MB, say 11MB, we make base target to level 4 and now the targets looks like:
    [- - - 1.1MB 11MB]
    While data are accumulated, size targets are tuned based on actual data of level 5. When level 5 has 50MB of data, the target is like:
    [- - - 5MB 50MB]
    Until level 5's actual size is more than 100MB, say 101MB. Now if we keep level 4 to be the base level, its target size needs to be 10.1MB, which doesn't satisfy the target size range. So now we make level 3 the target size and the target sizes of the levels look like:
    [- - 1.01MB 10.1MB 101MB]
    In the same way, while level 5 further grows, all levels' targets grow, like
    [- - 5MB 50MB 500MB]
    Until level 5 exceeds 1000MB and becomes 1001MB, we make level 2 the base level and make levels' target sizes like this:
    [- 1.001MB 10.01MB 100.1MB 1001MB]
    and go on...
    
    By doing it, we give max_bytes_for_level_multiplier a priority against max_bytes_for_level_base, for a more predictable LSM tree shape. It is useful to limit worse case space amplification.
    
    max_bytes_for_level_multiplier_additional is ignored with this flag on.
    
    Turning this feature on or off for an existing DB can cause unexpected LSM tree structure so it's not recommended.
    
    Caution: this option is experimental
    
    Default: false
    Parameters:
    enableLevelCompactionDynamicLevelBytes - boolean value indicating if LevelCompactionDynamicLevelBytes shall be enabled.
    
    Returns:
    the reference to the current option.
  - levelCompactionDynamicLevelBytes
```
boolean levelCompactionDynamicLevelBytes()
```
    Return if LevelCompactionDynamicLevelBytes is enabled.
    
    For further information see setLevelCompactionDynamicLevelBytes(boolean)
    
    Returns:
    boolean value indicating if levelCompactionDynamicLevelBytes is enabled.
  - setMaxBytesForLevelMultiplier
```
java.lang.Object setMaxBytesForLevelMultiplier(int multiplier)
```
    The ratio between the total size of level-(L+1) files and the total size of level-L files for all L. DEFAULT: 10
    
    Parameters:
    multiplier - the ratio between the total size of level-(L+1) files and the total size of level-L files for all L.
    
    Returns:
    the reference to the current option.
    See Also:
    setMaxBytesForLevelBase(long)
  - maxBytesForLevelMultiplier
```
int maxBytesForLevelMultiplier()
```
    The ratio between the total size of level-(L+1) files and the total size of level-L files for all L. DEFAULT: 10
    
    Returns:
    the ratio between the total size of level-(L+1) files and the total size of level-L files for all L.
    See Also:
    maxBytesForLevelBase()
  - setExpandedCompactionFactor
```
java.lang.Object setExpandedCompactionFactor(int expandedCompactionFactor)
```
    Maximum number of bytes in all compacted files. We avoid expanding the lower level file set of a compaction if it would make the total compaction cover more than (expanded_compaction_factor * targetFileSizeLevel()) many bytes.
    
    Parameters:
    expandedCompactionFactor - the maximum number of bytes in all compacted files.
    
    Returns:
    the reference to the current option.
    See Also:
    setSourceCompactionFactor(int)
  - expandedCompactionFactor
```
int expandedCompactionFactor()
```
    Maximum number of bytes in all compacted files. We avoid expanding the lower level file set of a compaction if it would make the total compaction cover more than (expanded_compaction_factor * targetFileSizeLevel()) many bytes.
    
    Returns:
    the maximum number of bytes in all compacted files.
    See Also:
    sourceCompactionFactor()
  - setSourceCompactionFactor
```
java.lang.Object setSourceCompactionFactor(int sourceCompactionFactor)
```
    Maximum number of bytes in all source files to be compacted in a single compaction run. We avoid picking too many files in the source level so that we do not exceed the total source bytes for compaction to exceed (source_compaction_factor * targetFileSizeLevel()) many bytes. Default:1, i.e. pick maxfilesize amount of data as the source of a compaction.
    
    Parameters:
    sourceCompactionFactor - the maximum number of bytes in all source files to be compacted in a single compaction run.
    
    Returns:
    the reference to the current option.
    See Also:
    setExpandedCompactionFactor(int)
  - sourceCompactionFactor
```
int sourceCompactionFactor()
```
    Maximum number of bytes in all source files to be compacted in a single compaction run. We avoid picking too many files in the source level so that we do not exceed the total source bytes for compaction to exceed (source_compaction_factor * targetFileSizeLevel()) many bytes. Default:1, i.e. pick maxfilesize amount of data as the source of a compaction.
    
    Returns:
    the maximum number of bytes in all source files to be compactedo.
    See Also:
    expandedCompactionFactor()
  - setMaxGrandparentOverlapFactor
```
java.lang.Object setMaxGrandparentOverlapFactor(int maxGrandparentOverlapFactor)
```
    Control maximum bytes of overlaps in grandparent (i.e., level+2) before we stop building a single file in a level->level+1 compaction.
    
    Parameters:
    maxGrandparentOverlapFactor - maximum bytes of overlaps in "grandparent" level.
    
    Returns:
    the reference to the current option.
  - maxGrandparentOverlapFactor
```
int maxGrandparentOverlapFactor()
```
    Control maximum bytes of overlaps in grandparent (i.e., level+2) before we stop building a single file in a level->level+1 compaction.
    
    Returns:
    maximum bytes of overlaps in "grandparent" level.
  - setSoftRateLimit
```
java.lang.Object setSoftRateLimit(double softRateLimit)
```
    Puts are delayed 0-1 ms when any level has a compaction score that exceeds soft_rate_limit. This is ignored when == 0.0. CONSTRAINT: soft_rate_limit ≤ hard_rate_limit. If this constraint does not hold, RocksDB will set soft_rate_limit = hard_rate_limit Default: 0 (disabled)
    
    Parameters:
    softRateLimit - the soft-rate-limit of a compaction score for put delay.
    
    Returns:
    the reference to the current option.
  - softRateLimit
```
double softRateLimit()
```
    Puts are delayed 0-1 ms when any level has a compaction score that exceeds soft_rate_limit. This is ignored when == 0.0. CONSTRAINT: soft_rate_limit ≤ hard_rate_limit. If this constraint does not hold, RocksDB will set soft_rate_limit = hard_rate_limit Default: 0 (disabled)
    
    Returns:
    soft-rate-limit for put delay.
  - setHardRateLimit
```
java.lang.Object setHardRateLimit(double hardRateLimit)
```
    Puts are delayed 1ms at a time when any level has a compaction score that exceeds hard_rate_limit. This is ignored when ≤ 1.0. Default: 0 (disabled)
    
    Parameters:
    hardRateLimit - the hard-rate-limit of a compaction score for put delay.
    
    Returns:
    the reference to the current option.
  - hardRateLimit
```
double hardRateLimit()
```
    Puts are delayed 1ms at a time when any level has a compaction score that exceeds hard_rate_limit. This is ignored when ≤ 1.0. Default: 0 (disabled)
    
    Returns:
    the hard-rate-limit of a compaction score for put delay.
  - setRateLimitDelayMaxMilliseconds
```
java.lang.Object setRateLimitDelayMaxMilliseconds(int rateLimitDelayMaxMilliseconds)
```
    The maximum time interval a put will be stalled when hard_rate_limit is enforced. If 0, then there is no limit. Default: 1000
    
    Parameters:
    rateLimitDelayMaxMilliseconds - the maximum time interval a put will be stalled.
    
    Returns:
    the reference to the current option.
  - rateLimitDelayMaxMilliseconds
```
int rateLimitDelayMaxMilliseconds()
```
    The maximum time interval a put will be stalled when hard_rate_limit is enforced. If 0, then there is no limit. Default: 1000
    
    Returns:
    the maximum time interval a put will be stalled when hard_rate_limit is enforced.
  - setArenaBlockSize
```
java.lang.Object setArenaBlockSize(long arenaBlockSize)
```
    The size of one block in arena memory allocation. If ≤ 0, a proper value is automatically calculated (usually 1/10 of writer_buffer_size). There are two additional restriction of the The specified size: (1) size should be in the range of [4096, 2 << 30] and (2) be the multiple of the CPU word (which helps with the memory alignment). We'll automatically check and adjust the size number to make sure it conforms to the restrictions. Default: 0
    
    Parameters:
    arenaBlockSize - the size of an arena block
    
    Returns:
    the reference to the current option.
    
    Throws:
    
    java.lang.IllegalArgumentException - thrown on 32-Bit platforms while overflowing the underlying platform specific value.
  - arenaBlockSize
```
long arenaBlockSize()
```
    The size of one block in arena memory allocation. If ≤ 0, a proper value is automatically calculated (usually 1/10 of writer_buffer_size). There are two additional restriction of the The specified size: (1) size should be in the range of [4096, 2 << 30] and (2) be the multiple of the CPU word (which helps with the memory alignment). We'll automatically check and adjust the size number to make sure it conforms to the restrictions. Default: 0
    
    Returns:
    the size of an arena block
  - setDisableAutoCompactions
```
java.lang.Object setDisableAutoCompactions(boolean disableAutoCompactions)
```
    Disable automatic compactions. Manual compactions can still be issued on this column family
    
    Parameters:
    disableAutoCompactions - true if auto-compactions are disabled.
    
    Returns:
    the reference to the current option.
  - disableAutoCompactions
```
boolean disableAutoCompactions()
```
    Disable automatic compactions. Manual compactions can still be issued on this column family
    
    Returns:
    true if auto-compactions are disabled.
  - setPurgeRedundantKvsWhileFlush
```
java.lang.Object setPurgeRedundantKvsWhileFlush(boolean purgeRedundantKvsWhileFlush)
```
    Purge duplicate/deleted keys when a memtable is flushed to storage. Default: true
    
    Parameters:
    purgeRedundantKvsWhileFlush - true if purging keys is disabled.
    
    Returns:
    the reference to the current option.
  - purgeRedundantKvsWhileFlush
```
boolean purgeRedundantKvsWhileFlush()
```
    Purge duplicate/deleted keys when a memtable is flushed to storage. Default: true
    
    Returns:
    true if purging keys is disabled.
  - setCompactionStyle
```
java.lang.Object setCompactionStyle(CompactionStyle compactionStyle)
```
    Set compaction style for DB. Default: LEVEL.
    
    Parameters:
    compactionStyle - Compaction style.
    
    Returns:
    the reference to the current option.
  - compactionStyle
```
CompactionStyle compactionStyle()
```
    Compaction style for DB.
    
    Returns:
    Compaction style.
  - setMaxTableFilesSizeFIFO
```
java.lang.Object setMaxTableFilesSizeFIFO(long maxTableFilesSize)
```
    FIFO compaction option. The oldest table file will be deleted once the sum of table files reaches this size. The default value is 1GB (1 * 1024 * 1024 * 1024).
    
    Parameters:
    maxTableFilesSize - the size limit of the total sum of table files.
    
    Returns:
    the instance of the current Object.
  - maxTableFilesSizeFIFO
```
long maxTableFilesSizeFIFO()
```
    FIFO compaction option. The oldest table file will be deleted once the sum of table files reaches this size. The default value is 1GB (1 * 1024 * 1024 * 1024).
    
    Returns:
    the size limit of the total sum of table files.
  - setVerifyChecksumsInCompaction
```
java.lang.Object setVerifyChecksumsInCompaction(boolean verifyChecksumsInCompaction)
```
    If true, compaction will verify checksum on every read that happens as part of compaction Default: true
    
    Parameters:
    verifyChecksumsInCompaction - true if compaction verifies checksum on every read.
    
    Returns:
    the reference to the current option.
  - verifyChecksumsInCompaction
```
boolean verifyChecksumsInCompaction()
```
    If true, compaction will verify checksum on every read that happens as part of compaction Default: true
    
    Returns:
    true if compaction verifies checksum on every read.
  - setFilterDeletes
```
java.lang.Object setFilterDeletes(boolean filterDeletes)
```
    Use KeyMayExist API to filter deletes when this is true. If KeyMayExist returns false, i.e. the key definitely does not exist, then the delete is a noop. KeyMayExist only incurs in-memory look up. This optimization avoids writing the delete to storage when appropriate. Default: false
    
    Parameters:
    filterDeletes - true if filter-deletes behavior is on.
    
    Returns:
    the reference to the current option.
  - filterDeletes
```
boolean filterDeletes()
```
    Use KeyMayExist API to filter deletes when this is true. If KeyMayExist returns false, i.e. the key definitely does not exist, then the delete is a noop. KeyMayExist only incurs in-memory look up. This optimization avoids writing the delete to storage when appropriate. Default: false
    
    Returns:
    true if filter-deletes behavior is on.
  - setMaxSequentialSkipInIterations
```
java.lang.Object setMaxSequentialSkipInIterations(long maxSequentialSkipInIterations)
```
    An iteration->Next() sequentially skips over keys with the same user-key unless this option is set. This number specifies the number of keys (with the same userkey) that will be sequentially skipped before a reseek is issued. Default: 8
    
    Parameters:
    maxSequentialSkipInIterations - the number of keys could be skipped in a iteration.
    
    Returns:
    the reference to the current option.
  - maxSequentialSkipInIterations
```
long maxSequentialSkipInIterations()
```
    An iteration->Next() sequentially skips over keys with the same user-key unless this option is set. This number specifies the number of keys (with the same userkey) that will be sequentially skipped before a reseek is issued. Default: 8
    
    Returns:
    the number of keys could be skipped in a iteration.
  - setMemTableConfig
```
java.lang.Object setMemTableConfig(MemTableConfig config)
```
    Set the config for mem-table.
    
    Parameters:
    config - the mem-table config.
    
    Returns:
    the instance of the current Object.
    
    Throws:
    
    java.lang.IllegalArgumentException - thrown on 32-Bit platforms while overflowing the underlying platform specific value.
  - memTableFactoryName
```
java.lang.String memTableFactoryName()
```
    Returns the name of the current mem table representation. Memtable format can be set using setTableFormatConfig.
    
    Returns:
    the name of the currently-used memtable factory.
    See Also:
    setTableFormatConfig(org.rocksdb.TableFormatConfig)
  - setTableFormatConfig
```
java.lang.Object setTableFormatConfig(TableFormatConfig config)
```
    Set the config for table format.
    
    Parameters:
    config - the table format config.
    
    Returns:
    the reference of the current Options.
  - tableFactoryName
```
java.lang.String tableFactoryName()
```
    Returns:
    the name of the currently used table factory.
  - setInplaceUpdateSupport
```
java.lang.Object setInplaceUpdateSupport(boolean inplaceUpdateSupport)
```
    Allows thread-safe inplace updates. If inplace_callback function is not set, Put(key, new_value) will update inplace the existing_value iff * key exists in current memtable * new sizeof(new_value) ≤ sizeof(existing_value) * existing_value for that key is a put i.e. kTypeValue If inplace_callback function is set, check doc for inplace_callback. Default: false.
    
    Parameters:
    inplaceUpdateSupport - true if thread-safe inplace updates are allowed.
    
    Returns:
    the reference to the current option.
  - inplaceUpdateSupport
```
boolean inplaceUpdateSupport()
```
    Allows thread-safe inplace updates. If inplace_callback function is not set, Put(key, new_value) will update inplace the existing_value iff * key exists in current memtable * new sizeof(new_value) ≤ sizeof(existing_value) * existing_value for that key is a put i.e. kTypeValue If inplace_callback function is set, check doc for inplace_callback. Default: false.
    
    Returns:
    true if thread-safe inplace updates are allowed.
  - setInplaceUpdateNumLocks
```
java.lang.Object setInplaceUpdateNumLocks(long inplaceUpdateNumLocks)
```
    Number of locks used for inplace update Default: 10000, if inplace_update_support = true, else 0.
    
    Parameters:
    inplaceUpdateNumLocks - the number of locks used for inplace updates.
    
    Returns:
    the reference to the current option.
    
    Throws:
    
    java.lang.IllegalArgumentException - thrown on 32-Bit platforms while overflowing the underlying platform specific value.
  - inplaceUpdateNumLocks
```
long inplaceUpdateNumLocks()
```
    Number of locks used for inplace update Default: 10000, if inplace_update_support = true, else 0.
    
    Returns:
    the number of locks used for inplace update.
  - setMemtablePrefixBloomBits
```
java.lang.Object setMemtablePrefixBloomBits(int memtablePrefixBloomBits)
```
    Sets the number of bits used in the prefix bloom filter. This value will be used only when a prefix-extractor is specified.
    
    Parameters:
    memtablePrefixBloomBits - the number of bits used in the prefix bloom filter.
    
    Returns:
    the reference to the current option.
  - memtablePrefixBloomBits
```
int memtablePrefixBloomBits()
```
    Returns the number of bits used in the prefix bloom filter. This value will be used only when a prefix-extractor is specified.
    
    Returns:
    the number of bloom-bits.
    See Also:
    useFixedLengthPrefixExtractor(int)
  - setMemtablePrefixBloomProbes
```
java.lang.Object setMemtablePrefixBloomProbes(int memtablePrefixBloomProbes)
```
    The number of hash probes per key used in the mem-table.
    
    Parameters:
    memtablePrefixBloomProbes - the number of hash probes per key.
    
    Returns:
    the reference to the current option.
  - memtablePrefixBloomProbes
```
int memtablePrefixBloomProbes()
```
    The number of hash probes per key used in the mem-table.
    
    Returns:
    the number of hash probes per key.
  - setBloomLocality
```
java.lang.Object setBloomLocality(int bloomLocality)
```
    Control locality of bloom filter probes to improve cache miss rate. This option only applies to memtable prefix bloom and plaintable prefix bloom. It essentially limits the max number of cache lines each bloom filter check can touch. This optimization is turned off when set to 0. The number should never be greater than number of probes. This option can boost performance for in-memory workload but should use with care since it can cause higher false positive rate. Default: 0
    
    Parameters:
    bloomLocality - the level of locality of bloom-filter probes.
    
    Returns:
    the reference to the current option.
  - bloomLocality
```
int bloomLocality()
```
    Control locality of bloom filter probes to improve cache miss rate. This option only applies to memtable prefix bloom and plaintable prefix bloom. It essentially limits the max number of cache lines each bloom filter check can touch. This optimization is turned off when set to 0. The number should never be greater than number of probes. This option can boost performance for in-memory workload but should use with care since it can cause higher false positive rate. Default: 0
    
    Returns:
    the level of locality of bloom-filter probes.
    See Also:
    setMemtablePrefixBloomProbes(int)
  - setMaxSuccessiveMerges
```
java.lang.Object setMaxSuccessiveMerges(long maxSuccessiveMerges)
```
    Maximum number of successive merge operations on a key in the memtable. When a merge operation is added to the memtable and the maximum number of successive merges is reached, the value of the key will be calculated and inserted into the memtable instead of the merge operation. This will ensure that there are never more than max_successive_merges merge operations in the memtable. Default: 0 (disabled)
    
    Parameters:
    maxSuccessiveMerges - the maximum number of successive merges.
    
    Returns:
    the reference to the current option.
    
    Throws:
    
    java.lang.IllegalArgumentException - thrown on 32-Bit platforms while overflowing the underlying platform specific value.
  - maxSuccessiveMerges
```
long maxSuccessiveMerges()
```
    Maximum number of successive merge operations on a key in the memtable. When a merge operation is added to the memtable and the maximum number of successive merges is reached, the value of the key will be calculated and inserted into the memtable instead of the merge operation. This will ensure that there are never more than max_successive_merges merge operations in the memtable. Default: 0 (disabled)
    
    Returns:
    the maximum number of successive merges.
  - setMinPartialMergeOperands
```
java.lang.Object setMinPartialMergeOperands(int minPartialMergeOperands)
```
    The number of partial merge operands to accumulate before partial merge will be performed. Partial merge will not be called if the list of values to merge is less than min_partial_merge_operands. If min_partial_merge_operands < 2, then it will be treated as 2. Default: 2
    
    Parameters:
    minPartialMergeOperands - min partial merge operands
    
    Returns:
    the reference to the current option.
  - minPartialMergeOperands
```
int minPartialMergeOperands()
```
    The number of partial merge operands to accumulate before partial merge will be performed. Partial merge will not be called if the list of values to merge is less than min_partial_merge_operands. If min_partial_merge_operands < 2, then it will be treated as 2. Default: 2
    
    Returns:
    min partial merge operands
  - setOptimizeFiltersForHits
```
java.lang.Object setOptimizeFiltersForHits(boolean optimizeFiltersForHits)
```
    This flag specifies that the implementation should optimize the filters mainly for cases where keys are found rather than also optimize for keys missed. This would be used in cases where the application knows that there are very few misses or the performance in the case of misses is not important.
    
    For now, this flag allows us to not store filters for the last level i.e the largest level which contains data of the LSM store. For keys which are hits, the filters in this level are not useful because we will search for the data anyway.
    
    NOTE: the filters in other levels are still useful even for key hit because they tell us whether to look in that level or go to the higher level.
    
    Default: false
    
    Parameters:
    optimizeFiltersForHits - boolean value indicating if this flag is set.
    
    Returns:
    the reference to the current option.
  - optimizeFiltersForHits
```
boolean optimizeFiltersForHits()
```
    Returns the current state of the optimize_filters_for_hits setting.
    
    Returns:
    boolean value indicating if the flag optimize_filters_for_hits was set.

Interface ColumnFamilyOptionsInterface

Field Summary

Method Summary

Field Detail

DEFAULT_COMPACTION_MEMTABLE_MEMORY_BUDGET

Method Detail

optimizeForPointLookup

optimizeLevelStyleCompaction

optimizeLevelStyleCompaction

optimizeUniversalStyleCompaction

optimizeUniversalStyleCompaction

setComparator

setComparator

setMergeOperatorName

setMergeOperator

setWriteBufferSize

writeBufferSize

setMaxWriteBufferNumber

maxWriteBufferNumber

setMinWriteBufferNumberToMerge

minWriteBufferNumberToMerge

useFixedLengthPrefixExtractor

useCappedPrefixExtractor

setCompressionType

compressionType

setCompressionPerLevel

compressionPerLevel

setNumLevels

numLevels

setLevelZeroFileNumCompactionTrigger

levelZeroFileNumCompactionTrigger

setLevelZeroSlowdownWritesTrigger

levelZeroSlowdownWritesTrigger

setLevelZeroStopWritesTrigger

levelZeroStopWritesTrigger

setMaxMemCompactionLevel

maxMemCompactionLevel

setTargetFileSizeBase

targetFileSizeBase

setTargetFileSizeMultiplier

targetFileSizeMultiplier

setMaxBytesForLevelBase

maxBytesForLevelBase

setLevelCompactionDynamicLevelBytes

Example

levelCompactionDynamicLevelBytes

setMaxBytesForLevelMultiplier

maxBytesForLevelMultiplier

setExpandedCompactionFactor

expandedCompactionFactor

setSourceCompactionFactor

sourceCompactionFactor

setMaxGrandparentOverlapFactor

maxGrandparentOverlapFactor

setSoftRateLimit

softRateLimit

setHardRateLimit

hardRateLimit

setRateLimitDelayMaxMilliseconds

rateLimitDelayMaxMilliseconds

setArenaBlockSize

arenaBlockSize

setDisableAutoCompactions

disableAutoCompactions

setPurgeRedundantKvsWhileFlush

purgeRedundantKvsWhileFlush

setCompactionStyle

compactionStyle

setMaxTableFilesSizeFIFO

maxTableFilesSizeFIFO

setVerifyChecksumsInCompaction

verifyChecksumsInCompaction

setFilterDeletes

filterDeletes

setMaxSequentialSkipInIterations

maxSequentialSkipInIterations

setMemTableConfig

memTableFactoryName

setTableFormatConfig

tableFactoryName