OPerformanceStatisticManager (OrientDB Core 3.0.34 API)

java.lang.Object
- com.orientechnologies.orient.core.storage.impl.local.statistic.OPerformanceStatisticManager

```
public class OPerformanceStatisticManager
extends Object
```
Aggregator of performance statistic for whole storage. Allows to gather performance statistic for single thread or for all threads in storage. In case of gathering statistics for single thread statistic for all period is gathered and average values are provided. If you gather statistic for whole system time series of measurements are provided. You can not measure statistic for whole system and for chosen threads at the same time. To gather statistic for single thread use following workflow:
1. Call startThreadMonitoring()
2. Execute database commands
3. Call stopThreadMonitoring()
Instance of OSessionStoragePerformanceStatistic returned as result of call of last method will contain all performance data are gathered during storage monitoring. To gather statistic for whole system use following workflow:
1. Call startMonitoring()
2. During monitoring of storage use getXXX methods to get information about performance numbers
3. At the end of monitoring call stopMonitoring()
You may access performance data both after you stopped gathering statistic and during gathering of statistic. You may manipulate by manager directly from Java or from JMX from bean with name which consist of prefix MBEAN_PREFIX and storage name. If ODurableComponent participates in performance monitoring it has to register itself using method registerComponent(String)

Constructor Summary

Constructors
Constructor and Description
`OPerformanceStatisticManager(OAbstractPaginatedStorage storage, long intervalBetweenSnapshots, long cleanUpInterval)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`long`	`getAmountOfPagesPerOperation(String componentName)` Average amount of pages which were read from cache for component with given name during single data operation.
`int`	`getCacheHits()`
`int`	`getCacheHits(String componentName)` Percent of cache hits for component name of which is passed as method argument.
`long`	`getCommitTime()`
`Set<String>`	`getComponentNames()`
`long`	`getExclusiveWriteCacheSize()`
`long`	`getFullCheckpointCount()`
`long`	`getFullCheckpointTime()`
`long`	`getReadCacheSize()`
`long`	`getReadSpeedFromCacheInPages()`
`long`	`getReadSpeedFromCacheInPages(String componentName)` Read speed of data in pages per second on cache level for component name of which is passed as method argument.
`long`	`getReadSpeedFromFileInPages()`
`long`	`getReadSpeedFromFileInPages(String componentName)` Read speed of data from file system in pages for component name of which is passed as method argument.
`OSessionStoragePerformanceStatistic`	`getSessionPerformanceStatistic()`
`long`	`getWALFlushTime()`
`long`	`getWALLogRecordTime()`
`long`	`getWALStartAOLogRecordTime()`
`long`	`getWALStopAOLogRecordTime()`
`long`	`getWriteCacheFlushOperationsTime()`
`long`	`getWriteCacheFuzzyCheckpointTime()`
`long`	`getWriteCacheOverflowCount()`
`long`	`getWriteCachePagesPerFlush()`
`long`	`getWriteCacheSize()`
`long`	`getWriteSpeedInCacheInPages()`
`long`	`getWriteSpeedInCacheInPages(String componentName)` Write speed of data in pages per second on cache level for component name of which is passed as method argument.
`void`	`registerComponent(String component)` Registers component as such one which participates in performance monitoring.
`void`	`registerMBean(String storageName, int storageId)` Registers JMX bean for current manager.
`void`	`startMonitoring()` Starts performance monitoring only for whole system.
`void`	`startThreadMonitoring()` Starts performance monitoring only for single thread.
`void`	`stopMonitoring()` Stops monitoring of performance statistic for whole system.
`OSessionStoragePerformanceStatistic`	`stopThreadMonitoring()`
`void`	`unregisterMBean(String storageName, int storageId)` Deregisters JMX bean for current manager.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - OPerformanceStatisticManager
```
public OPerformanceStatisticManager(OAbstractPaginatedStorage storage,
                                    long intervalBetweenSnapshots,
                                    long cleanUpInterval)
```
    Parameters:
    
    intervalBetweenSnapshots - Interval between snapshots of performance data for each thread statistic.
    
    cleanUpInterval - Interval between time series of performance data.
    
    See Also:
    
    OSessionStoragePerformanceStatistic
- Method Detail
  - startThreadMonitoring
```
public void startThreadMonitoring()
```
    Starts performance monitoring only for single thread. After call of this method you can not start system wide monitoring till call of stopThreadMonitoring() is performed.
  - stopThreadMonitoring
```
public OSessionStoragePerformanceStatistic stopThreadMonitoring()
```
    Returns:
    
    Container for gathered performance statistic or null if startThreadMonitoring() is not called.
  - startMonitoring
```
public void startMonitoring()
```
    Starts performance monitoring only for whole system. After call of this method you can not start monitoring on thread level till call of stopMonitoring() is performed.
  - stopMonitoring
```
public void stopMonitoring()
```
    Stops monitoring of performance statistic for whole system.
  - registerMBean
```
public void registerMBean(String storageName,
                          int storageId)
```
    Registers JMX bean for current manager.
    
    Parameters:
    
    storageName - Name of storage of given manager
    
    storageId - Id of storage of given manager
    
    See Also:
    
    OStorage.getName(), OIdentifiableStorage.getId()
  - unregisterMBean
```
public void unregisterMBean(String storageName,
                            int storageId)
```
    Deregisters JMX bean for current manager.
    
    Parameters:
    
    storageName - Name of storage of given manager
    
    storageId - Id of storage of given manager
    
    See Also:
    
    OStorage.getName(), OIdentifiableStorage.getId()
  - registerComponent
```
public void registerComponent(String component)
```
    Registers component as such one which participates in performance monitoring.
    
    Parameters:
    
    component - Component which participates in performance monitoring.
  - getComponentNames
```
public Set<String> getComponentNames()
```
    Returns:
    
    Set of names of components for which performance statistic is gathered.
  - getSessionPerformanceStatistic
```
public OSessionStoragePerformanceStatistic getSessionPerformanceStatistic()
```
    Returns:
    
    Instance of performance container which is used to gathering data about storage performance statistic or null if none of both methods startMonitoring() or startThreadMonitoring() are called.
  - getAmountOfPagesPerOperation
```
public long getAmountOfPagesPerOperation(String componentName)
```
    Average amount of pages which were read from cache for component with given name during single data operation. If null value is passed or data for component with passed in name does not exist then -1 will be returned.
    
    Parameters:
    
    componentName - Name of component data of which should be returned. Name is case sensitive.
    
    Returns:
    
    Average amount of pages which were read from cache for component with given name during single data operation or value which is less than 0, which means that value cannot be calculated.
  - getCacheHits
```
public int getCacheHits()
```
    Returns:
    
    Percent of cache hits or value which is less than 0, which means that value cannot be calculated.
  - getCacheHits
```
public int getCacheHits(String componentName)
```
    Percent of cache hits for component name of which is passed as method argument. If null value is passed then value for whole system will be returned. If data for component with passed in name does not exist then -1 will be returned.
    
    Parameters:
    
    componentName - Name of component data of which should be returned. Name is case sensitive.
    
    Returns:
    
    Percent of cache hits or value which is less than 0, which means that value cannot be calculated.
  - getCommitTime
```
public long getCommitTime()
```
    Returns:
    
    Average time of commit of atomic operation in nanoseconds or value which is less than 0, which means that value cannot be calculated.
  - getReadSpeedFromCacheInPages
```
public long getReadSpeedFromCacheInPages()
```
    Returns:
    
    Read speed of data in pages per second on cache level or value which is less than 0, which means that value cannot be calculated.
  - getReadSpeedFromCacheInPages
```
public long getReadSpeedFromCacheInPages(String componentName)
```
    Read speed of data in pages per second on cache level for component name of which is passed as method argument. If null value is passed then value for whole system will be returned. If data for component with passed in name does not exist then -1 will be returned.
    
    Parameters:
    
    componentName - Name of component data of which should be returned. Name is case sensitive.
    
    Returns:
    
    Read speed of data in pages per second on cache level or value which is less than 0, which means that value cannot be calculated.
  - getReadSpeedFromFileInPages
```
public long getReadSpeedFromFileInPages()
```
    Returns:
    
    Read speed of data from file system in pages per second or value which is less than 0, which means that value cannot be calculated.
  - getReadSpeedFromFileInPages
```
public long getReadSpeedFromFileInPages(String componentName)
```
    Read speed of data from file system in pages for component name of which is passed as method argument. If null value is passed then value for whole system will be returned. If data for component with passed in name does not exist then -1 will be returned.
    
    Parameters:
    
    componentName - Name of component data of which should be returned. Name is case sensitive.
    
    Returns:
    
    Read speed of data from file system in pages per second or value which is less than 0, which means that value cannot be calculated.
  - getWriteSpeedInCacheInPages
```
public long getWriteSpeedInCacheInPages()
```
    Returns:
    
    Write speed of data in pages per second on cache level or value which is less than 0, which means that value cannot be calculated.
  - getWriteSpeedInCacheInPages
```
public long getWriteSpeedInCacheInPages(String componentName)
```
    Write speed of data in pages per second on cache level for component name of which is passed as method argument. If null value is passed then value for whole system will be returned. If data for component with passed in name does not exist then -1 will be returned.
    
    Parameters:
    
    componentName - Name of component data of which should be returned. Name is case sensitive.
    
    Returns:
    
    Write speed of data in pages per second on cache level or value which is less than 0, which means that value cannot be calculated.
  - getWriteCachePagesPerFlush
```
public long getWriteCachePagesPerFlush()
```
    Returns:
    
    Amount of pages which are flushed during "page flush" operation of write cache or -1 if value is undefined.
  - getWriteCacheFlushOperationsTime
```
public long getWriteCacheFlushOperationsTime()
```
    Returns:
    
    Amount of time which is spent on each "page flush" operation of write cache or -1 if value is undefined.
  - getWriteCacheFuzzyCheckpointTime
```
public long getWriteCacheFuzzyCheckpointTime()
```
    Returns:
    
    Amount of time which is spent on "fuzzy checkpoint" operation or -1 if value if undefined.
  - getFullCheckpointTime
```
public long getFullCheckpointTime()
```
    Returns:
    
    Time which is spent on full checkpoint operation, or -1 if value is undefined
  - getFullCheckpointCount
```
public long getFullCheckpointCount()
```
    Returns:
    
    Amount of times full checkpoint operations is called on storage, or -1 if this value is undefined.
  - getReadCacheSize
```
public long getReadCacheSize()
```
    Returns:
    
    Size of read cache in bytes or -1 if value is undefined.
  - getWriteCacheSize
```
public long getWriteCacheSize()
```
    Returns:
    
    Size of write cache in bytes or -1 if value is undefined.
  - getExclusiveWriteCacheSize
```
public long getExclusiveWriteCacheSize()
```
    Returns:
    
    Size of part of write cache which exclusively belongs to only this cache or -1 if value is undefined
  - getWriteCacheOverflowCount
```
public long getWriteCacheOverflowCount()
```
    Returns:
    
    Amount of times when size of write cache is not enough to keep dirty pages and flush of write cache is forced, or -1 if this value is undefined.
  - getWALLogRecordTime
```
public long getWALLogRecordTime()
```
    Returns:
    
    time which is spent on logging of single record or -1 if value is undefined.
  - getWALStartAOLogRecordTime
```
public long getWALStartAOLogRecordTime()
```
    Returns:
    
    Time which is spent on logging of "start atomic operation" record or -1 if value is undefined.
  - getWALStopAOLogRecordTime
```
public long getWALStopAOLogRecordTime()
```
    Returns:
    
    time which is spent on logging of "stop atomic operation" record or -1 if value is undefined.
  - getWALFlushTime
```
public long getWALFlushTime()
```
    Returns:
    
    time which is spent on flush of WAL cache or -1 if value is undefined

Class OPerformanceStatisticManager

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

OPerformanceStatisticManager

Method Detail

startThreadMonitoring

stopThreadMonitoring

startMonitoring

stopMonitoring

registerMBean

unregisterMBean

registerComponent

getComponentNames

getSessionPerformanceStatistic

getAmountOfPagesPerOperation

getCacheHits

getCacheHits

getCommitTime

getReadSpeedFromCacheInPages

getReadSpeedFromCacheInPages

getReadSpeedFromFileInPages

getReadSpeedFromFileInPages

getWriteSpeedInCacheInPages

getWriteSpeedInCacheInPages

getWriteCachePagesPerFlush

getWriteCacheFlushOperationsTime

getWriteCacheFuzzyCheckpointTime

getFullCheckpointTime

getFullCheckpointCount

getReadCacheSize

getWriteCacheSize

getExclusiveWriteCacheSize

getWriteCacheOverflowCount

getWALLogRecordTime

getWALStartAOLogRecordTime

getWALStopAOLogRecordTime

getWALFlushTime