BtreeStats (Oracle - Berkeley DB Java API)
Date: 2020-06-01

Package com.sleepycat.db

## Class BtreeStats

- java.lang.Object
- - com.sleepycat.db.DatabaseStats
  - - com.sleepycat.db.BtreeStats

-     public class BtreeStats
      extends DatabaseStats

  The BtreeStats object is used to return Btree or Recno database statistics.

- - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `int` | `getDupPages()` | The number of database duplicate pages.
    `long` | `getDupPagesFree()` | The number of bytes free in database duplicate pages.
    `int` | `getEmptyPages()` | The number of empty database pages.
    `int` | `getExtFiles()` | The number of external files.
    `int` | `getFree()` | The number of pages on the free list.
    `int` | `getIntPages()` | The number of database internal pages.
    `long` | `getIntPagesFree()` | The number of bytes free in database internal pages.
    `int` | `getLeafPages()` | The number of database leaf pages.
    `long` | `getLeafPagesFree()` | The number of bytes free in database leaf pages.
    `int` | `getLevels()` | The number of levels in the database.
    `int` | `getMagic()` | The magic number that identifies the file as a Btree database.
    `int` | `getMetaFlags()` | Reports internal flags.
    `int` | `getMinKey()` | The minimum keys per page.
    `int` | `getNumBlobs()` |
    `int` | `getNumData()` | The number of key/data pairs or records in the database.
    `int` | `getNumKeys()` | The number of keys or records in the database.
    `int` | `getOverPages()` | The number of database overflow pages.
    `long` | `getOverPagesFree()` | The number of bytes free in database overflow pages.
    `int` | `getPageCount()` | The number of pages in the database.
    `int` | `getPageSize()` | The underlying database page size, in bytes.
    `int` | `getReLen()` | The length of fixed-length records.
    `int` | `getRePad()` | The padding byte value for fixed-length records.
    `int` | `getVersion()` | The version of the Btree database.
    `java.lang.String` | `toString()` | For convenience, the BtreeStats 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

    - #### getMagic

          public int getMagic()

      The magic number that identifies the file as a Btree database.
      Returns:
        the magic number that identifies the file as a Btree database

    - #### getVersion

          public int getVersion()

      The version of the Btree database.
      Returns:
        the version of the Btree database

    - #### getMetaFlags

          public int getMetaFlags()

      Reports internal flags. For internal use only.
      Returns:
        internal flags

    - #### getNumKeys

          public int getNumKeys()

      The number of keys or records in the database.

      For the Btree Access Method, the number of keys in the database. If the `Database.getStats` call was not configured by the `StatsConfig.setFast` method or the database was configured to support retrieval by record number, the count will be exact. Otherwise, the count will be the last saved value unless it has never been calculated, in which case it will be 0.

      For the Recno Access Method, the number of records in the database. If the database was configured with mutable record numbers the count will be exact. Otherwise, if the `Database.getStats` call was configured by the `StatsConfig.setFast` method, the count will be exact but will include deleted records; if the `Database.getStats` call was not configured by the `StatsConfig.setFast` method, the count will be exact and will not include deleted records.

      Returns:
        the number of keys or records in the database

    - #### getNumData

          public int getNumData()

      The number of key/data pairs or records in the database.

      For the Btree Access Method, the number of key/data pairs in the database. If the `Database.getStats` call was not configured by the `StatsConfig.setFast` method, the count will be exact. Otherwise, the count will be the last saved value unless it has never been calculated, in which case it will be 0.

      For the Recno Access Method, the number of records in the database. If the database was configured with mutable record numbers, the count will be exact. Otherwise, if the `Database.getStats` call was configured by the `StatsConfig.setFast` method, the count will be exact but will include deleted records; if the `Database.getStats` call was not configured by the `StatsConfig.setFast` method, the count will be exact and will not include deleted records.

      Returns:
        the number of key/data pairs or records in the database

    - #### getPageCount

          public int getPageCount()

      The number of pages in the database.

      Returned if `StatsConfig.setFast(boolean)` was configured.

      Returns:
        the number of pages in the database

    - #### getPageSize

          public int getPageSize()

      The underlying database page size, in bytes.
      Returns:
        the underlying database page size, in bytes

    - #### getMinKey

          public int getMinKey()

      The minimum keys per page.
      Returns:
        the minimum keys per page

    - #### getExtFiles

          public int getExtFiles()

      The number of external files.
      Returns:
        the number of external files

    - #### getNumBlobs

          public int getNumBlobs()

    - #### getReLen

          public int getReLen()

      The length of fixed-length records.
      Returns:
        the length of fixed-length records

    - #### getRePad

          public int getRePad()

      The padding byte value for fixed-length records.
      Returns:
        the padding byte value for fixed-length records

    - #### getLevels

          public int getLevels()

      The number of levels in the database.

      The information is only included if the `Database.getStats` call was not configured by the `StatsConfig.setFast` method.

      Returns:
        the number of levels in the database

    - #### getIntPages

          public int getIntPages()

      The number of database internal pages.

      The information is only included if the `Database.getStats` call was not configured by the `StatsConfig.setFast` method.

      Returns:
        the number of database internal pages

    - #### getLeafPages

          public int getLeafPages()

      The number of database leaf pages.

      The information is only included if the `Database.getStats` call was not configured by the `StatsConfig.setFast` method.

      Returns:
        the number of database leaf pages

    - #### getDupPages

          public int getDupPages()

      The number of database duplicate pages.

      The information is only included if the `Database.getStats` call was not configured by the `StatsConfig.setFast` method.

      Returns:
        the number of database duplicate pages

    - #### getOverPages

          public int getOverPages()

      The number of database overflow pages.

      The information is only included if the `Database.getStats` call was not configured by the `StatsConfig.setFast` method.

      Returns:
        the number of database overflow pages

    - #### getEmptyPages

          public int getEmptyPages()

      The number of empty database pages.

      The information is only included if the `Database.getStats` call was not configured by the `StatsConfig.setFast` method.

      Returns:
        the number of empty database pages

    - #### getFree

          public int getFree()

      The number of pages on the free list.

      The information is only included if the `Database.getStats` call was not configured by the `StatsConfig.setFast` method.

      Returns:
        the number of pages on the free list

    - #### getIntPagesFree

          public long getIntPagesFree()

      The number of bytes free in database internal pages.

      The information is only included if the `Database.getStats` call was not configured by the `StatsConfig.setFast` method.

      Returns:
        the number of bytes free in database internal pages

    - #### getLeafPagesFree

          public long getLeafPagesFree()

      The number of bytes free in database leaf pages.

      The information is only included if the `Database.getStats` call was not configured by the `StatsConfig.setFast` method.

      Returns:
        the number of bytes free in database leaf pages

    - #### getDupPagesFree

          public long getDupPagesFree()

      The number of bytes free in database duplicate pages.

      The information is only included if the `Database.getStats` call was not configured by the `StatsConfig.setFast` method.

      Returns:
        the number of bytes free in database duplicate pages

    - #### getOverPagesFree

          public long getOverPagesFree()

      The number of bytes free in database overflow pages.

      The information is only included if the `Database.getStats` call was not configured by the `StatsConfig.setFast` method.

      Returns:
        the number of bytes free in database overflow pages

    - #### toString

          public java.lang.String toString()

      For convenience, the BtreeStats class has a toString method that lists all the data fields.
      Overrides:
        `toString` in class `java.lang.Object`
      Returns:
        a String that lists all the data fields

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