4.292 DBA_HIST_BUFFER_POOL_STAT

DBA_HIST_BUFFER_POOL_STAT displays historical statistics about all buffer pools available for the instance.

This view contains snapshots of V$BUFFER_POOL_STATISTICS.

Column Datatype NULL Description

SNAP_ID

NUMBER

NOT NULL

Unique snapshot ID

DBID

NUMBER

NOT NULL

Database ID for the snapshot

INSTANCE_NUMBER

NUMBER

NOT NULL

Instance number for the snapshot

ID

NUMBER

NOT NULL

Buffer pool identifier number

NAME

VARCHAR2(20)

Name of the buffer pool

BLOCK_SIZE

NUMBER

Block Size

SET_MSIZE

NUMBER

Buffer pool maximum set size

CNUM_REPL

NUMBER

Number of buffers on the replacement list

CNUM_WRITE

NUMBER

Number of buffers on the write list

CNUM_SET

NUMBER

Number of buffers in the 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_DBID

NUMBER

The database ID of the PDB for the sampled session

CON_ID

NUMBER

The ID of the container that CON_DBID identifies. 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