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Oracle® Database Reference
12c Release 1 (12.1)

E17615-23
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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"