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: `RMAN` `DBWR` `LGWR` `ARCH` `XDB` `Streams` `AQ` `Data` `Pump` `Recovery` `Buffer` `Cache` `Reads` `Direct` `Reads` `Direct` `Writes` `Smart` `Scan` `Archive` `Manager` `Others`
`SMALL_READ_MEGABYTES`	`NUMBER`	Number of megabytes read via single block read requests
`SMALL_WRITE_MEGABYTES`	`NUMBER`	Number of megabytes written via single block write requests
`LARGE_READ_MEGABYTES`	`NUMBER`	Number of megabytes read via multiblock read requests
`LARGE_WRITE_MEGABYTES`	`NUMBER`	Number of megabytes written via multiblock write requests
`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 synchronous I/O waits by functionality
`WAIT_TIME`	`NUMBER`	Total synchronous I/O wait time (in milliseconds)