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(128)	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

See Also: “V$IOSTAT_FUNCTION”