CacheStats (Oracle - Berkeley DB Java API)

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Berkeley DB
version 5.3.28

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com.sleepycat.db
Class CacheStats

java.lang.Object
  com.sleepycat.db.CacheStats

public class CacheStats
extends Object
extends Object

Cache statistics for a database environment.

Method Summary
`long`	`getAlloc()` Number of page allocations.
`long`	`getAllocBuckets()` Number of hash buckets checked during allocation.
`long`	`getAllocMaxBuckets()` Maximum number of hash buckets checked during an allocation.
`long`	`getAllocMaxPages()` Maximum number of pages checked during an allocation.
`long`	`getAllocPages()` Number of pages checked during allocation.
`int`	`getBytes()` Bytes of cache (total cache size is st_gbytes + st_bytes).
`long`	`getCacheHit()` Requested pages found in the cache.
`long`	`getCacheMiss()` Requested pages not found in the cache.
`int`	`getGbytes()` Gigabytes of cache (total cache size is st_gbytes + st_bytes).
`int`	`getHashBuckets()` Number of hash buckets in the buffer hash table.
`long`	`getHashExamined()` Total number of hash elements traversed during hash table lookups.
`int`	`getHashLongest()` The longest chain ever encountered in buffer hash table lookups.
`long`	`getHashMaxNowait()` The number of times a thread of control was able to obtain the hash bucket lock without waiting on the bucket which had the maximum number of times that a thread of control needed to wait.
`long`	`getHashMaxWait()` The maximum number of times any hash bucket lock was waited for by a thread of control.
`int`	`getHashMutexes()` The number of hash bucket mutexes in the buffer hash table.
`long`	`getHashNowait()` The number of times that a thread of control was able to obtain a hash bucket lock without waiting.
`int`	`getHashSearches()` Total number of buffer hash table lookups.
`long`	`getHashWait()` The number of times that a thread of control was forced to wait before obtaining a hash bucket lock.
`long`	`getIoWait()` Number of operations blocked waiting for I/O to complete.
`int`	`getMap()` Requested pages mapped into the process' address space (there is no available information about whether or not this request caused disk I/O, although examining the application page fault rate may be helpful).
`int`	`getMaxNumCache()` Maximum number of caches, as configured with `EnvironmentConfig.setCacheMax(long)`.
`int`	`getMaxOpenfd()` Maximum number of open file descriptors.
`int`	`getMaxWrite()` The maximum number of sequential write operations scheduled by the library when flushing dirty pages from the cache.
`int`	`getMaxWriteSleep()` The number of microseconds the thread of control should pause before scheduling further write operations.
`long`	`getMmapSize()` Maximum file size for mmap.
`long`	`getMultiversionFreed()` Number of frozen buffers freed.
`long`	`getMultiversionFrozen()` Number of buffers frozen.
`long`	`getMultiversionThawed()` Number of buffers thawed.
`int`	`getNumCache()` Number of caches.
`int`	`getPageClean()` Clean pages currently in the cache.
`long`	`getPageCreate()` Pages created in the cache.
`int`	`getPageDirty()` Dirty pages currently in the cache.
`long`	`getPageIn()` Pages read into the cache.
`long`	`getPageOut()` Pages written from the cache to the backing file.
`int`	`getPages()` Pages in the cache.
`int`	`getPageSize()` Page size in bytes.
`long`	`getPageTrickle()` Dirty pages written using `Environment.trickleCacheWrite`.
`long`	`getRegionNowait()` The number of times that a thread of control was able to obtain a region lock without waiting.
`long`	`getRegionWait()` The number of times that a thread of control was forced to wait before obtaining a region lock.
`long`	`getRegmax()` The max size of the mutex region size.
`long`	`getRegSize()` Individual cache size.
`long`	`getRoEvict()` Clean pages forced from the cache.
`long`	`getRwEvict()` Dirty pages forced from the cache.
`long`	`getSyncInterrupted()` Number of mpool sync operations interrupted.
`String`	`toString()` For convenience, the CacheStats class has a toString method that lists all the data fields.

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

Method Detail

getGbytes

public int getGbytes()

Gigabytes of cache (total cache size is st_gbytes + st_bytes).

getBytes

public int getBytes()

Bytes of cache (total cache size is st_gbytes + st_bytes).

getNumCache

public int getNumCache()

Number of caches.

getMaxNumCache

public int getMaxNumCache()

Maximum number of caches, as configured with EnvironmentConfig.setCacheMax(long).

getMmapSize

public long getMmapSize()

Maximum file size for mmap.

getMaxOpenfd

public int getMaxOpenfd()

Maximum number of open file descriptors.

getMaxWrite

public int getMaxWrite()

The maximum number of sequential write operations scheduled by the library when flushing dirty pages from the cache.

getMaxWriteSleep

public int getMaxWriteSleep()

The number of microseconds the thread of control should pause before scheduling further write operations.

getPages

public int getPages()

Pages in the cache.

getMap

public int getMap()

Requested pages mapped into the process' address space (there is no available information about whether or not this request caused disk I/O, although examining the application page fault rate may be helpful).

getCacheHit

public long getCacheHit()

Requested pages found in the cache.

getCacheMiss

public long getCacheMiss()

Requested pages not found in the cache.

getPageCreate

public long getPageCreate()

Pages created in the cache.

getPageIn

public long getPageIn()

Pages read into the cache.

getPageOut

public long getPageOut()

Pages written from the cache to the backing file.

getRoEvict

public long getRoEvict()

Clean pages forced from the cache.

getRwEvict

public long getRwEvict()

Dirty pages forced from the cache.

getPageTrickle

public long getPageTrickle()

Dirty pages written using Environment.trickleCacheWrite.

getPageClean

public int getPageClean()

Clean pages currently in the cache.

getPageDirty

public int getPageDirty()

Dirty pages currently in the cache.

getHashBuckets

public int getHashBuckets()

Number of hash buckets in the buffer hash table.

getHashMutexes

public int getHashMutexes()

The number of hash bucket mutexes in the buffer hash table.

getPageSize

public int getPageSize()

Page size in bytes.

getHashSearches

public int getHashSearches()

Total number of buffer hash table lookups.

getHashLongest

public int getHashLongest()

The longest chain ever encountered in buffer hash table lookups.

getHashExamined

public long getHashExamined()

Total number of hash elements traversed during hash table lookups.

getHashNowait

public long getHashNowait()

The number of times that a thread of control was able to obtain a hash bucket lock without waiting.

getHashWait

public long getHashWait()

The number of times that a thread of control was forced to wait before obtaining a hash bucket lock.

getHashMaxNowait

public long getHashMaxNowait()

The number of times a thread of control was able to obtain the hash bucket lock without waiting on the bucket which had the maximum number of times that a thread of control needed to wait.

getHashMaxWait

public long getHashMaxWait()

The maximum number of times any hash bucket lock was waited for by a thread of control.

getRegionNowait

public long getRegionNowait()

The number of times that a thread of control was able to obtain a region lock without waiting.

getRegionWait

public long getRegionWait()

The number of times that a thread of control was forced to wait before obtaining a region lock.

getMultiversionFrozen

public long getMultiversionFrozen()

Number of buffers frozen.

getMultiversionThawed

public long getMultiversionThawed()

Number of buffers thawed.

getMultiversionFreed

public long getMultiversionFreed()

Number of frozen buffers freed.

getAlloc

public long getAlloc()

Number of page allocations.

getAllocBuckets

public long getAllocBuckets()

Number of hash buckets checked during allocation.

getAllocMaxBuckets

public long getAllocMaxBuckets()

Maximum number of hash buckets checked during an allocation.

getAllocPages

public long getAllocPages()

Number of pages checked during allocation.

getAllocMaxPages

public long getAllocMaxPages()

Maximum number of pages checked during an allocation.

getIoWait

public long getIoWait()

Number of operations blocked waiting for I/O to complete.

getSyncInterrupted

public long getSyncInterrupted()

Number of mpool sync operations interrupted.

getRegSize

public long getRegSize()

Individual cache size.

getRegmax

public long getRegmax()

The max size of the mutex region size.

toString

public String toString()

For convenience, the CacheStats class has a toString method that lists all the data fields.

Overrides:: toString in class Object