V$IOSTAT_FUNCTION displays disk I/O statistics for database functions (such as the LGWR and DBWR).
| Column | Datatype | Description |
|---|---|---|
FUNCTION_ID |
NUMBER |
Function ID |
FUNCTION_NAME |
VARCHAR2(18) |
Function name |
SMALL_READ_MEGABYTES |
NUMBER |
Number of single block megabytes read |
SMALL_WRITE_MEGABYTES |
NUMBER |
Number of single block megabytes written |
LARGE_READ_MEGABYTES |
NUMBER |
Number of multiblock megabytes read |
LARGE_WRITE_MEGABYTES |
NUMBER |
Number of multiblock megabytes written |
SMALL_READ_REQS |
NUMBER |
Number of single block read requests |
SMALL_WRITE_REQS |
NUMBER |
Number of single block write requests |
LARGE_READ_REQS |
NUMBER |
Number of multiblock read requests |
LARGE_WRITE_REQS |
NUMBER |
Number of multiblock write requests |
NUMBER_OF_WAITS |
NUMBER |
Number of I/O waits by functionality |
WAIT_TIME |
NUMBER |
Total wait time (in milliseconds) |