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 |