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Oracle® Database Reference
12c Release 1 (12.1)

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V$BUFFER_POOL_STATISTICS displays statistics about all buffer pools available for the instance.

Column Datatype Description
ID NUMBER Buffer pool identifier number
NAME VARCHAR2(20) Name of the buffer pool
BLOCK_SIZE NUMBER Block size (in bytes) for buffers in this pool. Possible values: the standard block size, the power of 2 nonstandard block sizes, 2048, 4096, 8192, 16384, 32768.
SET_MSIZE NUMBER Buffer pool maximum set size
CNUM_REPL NUMBER Number of buffers on replacement list
CNUM_WRITE NUMBER Number of buffers on write list
CNUM_SET NUMBER Number of buffers in set
BUF_GOT NUMBER Number of buffers gotten by the set
SUM_WRITE NUMBER Number of buffers written by the set
SUM_SCAN NUMBER Number of buffers scanned in the set
FREE_BUFFER_WAIT NUMBER Free buffer wait statistic
WRITE_COMPLETE_WAIT NUMBER Write complete wait statistic
BUFFER_BUSY_WAIT NUMBER Buffer busy wait statistic
FREE_BUFFER_INSPECTED NUMBER Free buffer inspected statistic
DIRTY_BUFFERS_INSPECTED NUMBER Dirty buffers inspected statistic
DB_BLOCK_CHANGE NUMBER Database blocks changed statistic
DB_BLOCK_GETS NUMBER Database blocks gotten statistic
CONSISTENT_GETS NUMBER Consistent gets statistic
PHYSICAL_READS NUMBER Physical reads statistic
PHYSICAL_WRITES NUMBER Physical writes statistic
CON_ID NUMBER The ID of the container to which the data pertains. Possible values include:
  • 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs.

  • 1: This value is used for rows containing data that pertain to only the root

  • n: Where n is the applicable container ID for the rows containing data

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