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Oracle® Database Reference
11g Release 1 (11.1)

B28320-03
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V$IOSTAT_FUNCTION

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)