CacheStats (Oracle - Berkeley DB Java API)
Date: 2013-09-09

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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
`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`

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