8.116 V$BUFFER_POOL_STATISTICS

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

CNUM_FLASH_REPLFoot 1

NUMBER

Current number of buffers in the L2/Flash/Spool LRU replacement list

CNUM_FLASH_KEEPFoot 1

NUMBER

Current number of buffers in the L2/Flash/Spool keep list

CNUM_FLASH_WRITEFoot 1

NUMBER

Current number of buffers in the L2 write list

CNUM_FLASH_SETFoot 1

NUMBER

Total number of buffers across all working sets

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

PHYSICAL_FLASH_READSFoot 1

NUMBER

Number of physical reads from L2/Flash/Spool across all working sets

PHYSICAL_FLASH_WRITESFoot 1

NUMBER

Number of physical writes to L2/Flash/Spool across all working sets

AGED_OUT_FLASH_BUFFERSFoot 1

NUMBER

Count of all L2/Flash/Spool aged out buffer across all working sets

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

Footnote 1 This column is available starting with Oracle AI Database 26ai, Release Update 23.26.2.

See Also:

"DB_CACHE_SIZE"