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Oracle® Database Reference
12c Release 1 (12.1)

E17615-24
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DBA_HIST_IOSTAT_FUNCTION

DBA_HIST_IOSTAT_FUNCTION displays historical I/O statistics by function. This view contains snapshots of V$IOSTAT_FUNCTION.

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
FUNCTION_ID NUMBER NOT NULL Function ID
FUNCTION_NAME VARCHAR2(30) NOT NULL Function name
SMALL_READ_MEGABYTES NUMBER NOT NULL Number of single block megabytes read
SMALL_WRITE_MEGABYTES NUMBER NOT NULL Number of single block megabytes written
LARGE_READ_MEGABYTES NUMBER NOT NULL Number of multiblock megabytes read
LARGE_WRITE_MEGABYTES NUMBER NOT NULL Number of multiblock megabytes written
SMALL_READ_REQS NUMBER NOT NULL Number of single block read requests
SMALL_WRITE_REQS NUMBER NOT NULL Number of single block write requests
LARGE_READ_REQS NUMBER NOT NULL Number of multiblock read requests
LARGE_WRITE_REQS NUMBER NOT NULL Number of multiblock write requests
NUMBER_OF_WAITS NUMBER NOT NULL Number of I/O waits by functionality
WAIT_TIME NUMBER NOT NULL Total wait time (in milliseconds)
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