4.330 DBA_HIST_IOSTAT_FILETYPE

DBA_HIST_IOSTAT_FILETYPE displays historical I/O statistics by file type.

This view contains snapshots of V$IOSTAT_FILE.

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
FILETYPE_ID	NUMBER	NOT NULL	Type of file (for example, log file, data file, and so on)
FILETYPE_NAME	VARCHAR2(30)	NOT NULL	Name of the file, in the case of a data file or temp file. For all other files, a corresponding string to be displayed (for example, ARCHIVELOG).
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
SMALL_SYNC_READ_REQS	NUMBER	NOT NULL	Number of synchronous single block read requests
LARGE_READ_REQS	NUMBER	NOT NULL	Number of multiblock read requests
LARGE_WRITE_REQS	NUMBER	NOT NULL	Number of multiblock write requests
SMALL_READ_SERVICETIME	NUMBER	NOT NULL	Total service time (in milliseconds) for single block read requests
SMALL_WRITE_SERVICETIME	NUMBER	NOT NULL	Total service time (in milliseconds) for single block write requests
SMALL_SYNC_READ_LATENCY	NUMBER	NOT NULL	Latency for single block synchronous reads (in milliseconds)
LARGE_READ_SERVICETIME	NUMBER	NOT NULL	Total service time (in milliseconds) for multiblock read requests
LARGE_WRITE_SERVICETIME	NUMBER	NOT NULL	Total service time (in milliseconds) for multiblock write requests
RETRIES_ON_ERROR	NUMBER	NOT NULL	Number of read retries on error
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_FILE"