CacheStats (Sleepycat Software, Inc.

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Berkeley DB
version 4.4.20

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com.sleepycat.db
Class CacheStats

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

public class CacheStats
extends Object

Cache statistics for a database environment.

Method Summary
`int`	`getAlloc()` Number of page allocations.
`int`	`getAllocBuckets()` Number of hash buckets checked during allocation.
`int`	`getAllocMaxBuckets()` Maximum number of hash buckets checked during an allocation.
`int`	`getAllocMaxPages()` Maximum number of pages checked during an allocation.
`int`	`getAllocPages()` Number of pages checked during allocation.
`int`	`getBytes()` Bytes of cache (total cache size is st_gbytes + st_bytes).
`int`	`getCacheHit()` Requested pages found in the cache.
`int`	`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 buffer hash table.
`int`	`getHashExamined()` Total number of hash elements traversed during hash table lookups.
`int`	`getHashLongest()` The longest chain ever encountered in buffer hash table lookups.
`int`	`getHashMaxWait()` The maximum number of times any hash bucket lock was waited for by a thread of control.
`int`	`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.
`int`	`getHashWait()` The number of times that a thread of control was forced to wait before obtaining a hash bucket lock.
`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`	`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.
`int`	`getMmapSize()` Maximum file size for mmap.
`int`	`getNumCache()` Number of caches.
`int`	`getPageClean()` Clean pages currently in the cache.
`int`	`getPageCreate()` Pages created in the cache.
`int`	`getPageDirty()` Dirty pages currently in the cache.
`int`	`getPageIn()` Pages read into the cache.
`int`	`getPageOut()` Pages written from the cache to the backing file.
`int`	`getPages()` Pages in the cache.
`int`	`getPageTrickle()` Dirty pages written using `Environment.trickleCacheWrite`.
`int`	`getRegionNowait()` The number of times that a thread of control was able to obtain a region lock without waiting.
`int`	`getRegionWait()` The number of times that a thread of control was forced to wait before obtaining a region lock.
`int`	`getRegSize()` Individual cache size.
`int`	`getRoEvict()` Clean pages forced from the cache.
`int`	`getRwEvict()` Dirty pages forced from the cache.
`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.

getRegSize

public int getRegSize()

Individual cache size.

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).

getMmapSize

public int 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.

getCacheHit

public int getCacheHit()

Requested pages found in the cache.

getCacheMiss

public int getCacheMiss()

Requested pages not found in the cache.

getPageCreate

public int getPageCreate()

Pages created in the cache.

getPageIn

public int getPageIn()

Pages read into the cache.

getPageOut

public int getPageOut()

Pages written from the cache to the backing file.

getRoEvict

public int getRoEvict()

Clean pages forced from the cache.

getRwEvict

public int getRwEvict()

Dirty pages forced from the cache.

getPageTrickle

public int getPageTrickle()

Dirty pages written using Environment.trickleCacheWrite.

getPages

public int getPages()

Pages in the cache.

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 buffer hash table.

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 int getHashExamined()

Total number of hash elements traversed during hash table lookups.

getHashNowait

public int getHashNowait()

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

getHashWait

public int getHashWait()

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

getHashMaxWait

public int getHashMaxWait()

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

getRegionNowait

public int getRegionNowait()

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

getRegionWait

public int getRegionWait()

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

getAlloc

public int getAlloc()

Number of page allocations.

getAllocBuckets

public int getAllocBuckets()

Number of hash buckets checked during allocation.

getAllocMaxBuckets

public int getAllocMaxBuckets()

Maximum number of hash buckets checked during an allocation.

getAllocPages

public int getAllocPages()

Number of pages checked during allocation.

getAllocMaxPages

public int getAllocMaxPages()

Maximum number of pages checked during an allocation.

toString

public String toString()

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