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  dba_hist_iostat_function tips

Oracle Database Tips by Donald BurlesonApril 10, 2015

Question:  What does the dba_hist_iostat_function?  Can you show an example script using dba_hist_iostat_function?

Answer: The AWR dba_hist_iostat_function table is new in 11gr2.  The docs note that dba_hist_iostat_function displays historical I/O statistics by function. This view contains snapshots of V$IOSTAT_FUNCTION view.  See

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
FUNCTION_ID NUMBER NOT NULL Function ID
FUNCTION_NAME VARCHAR2(18) NOT NULL Function name
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
LARGE_READ_REQS NUMBER NOT NULL Number of multiblock read requests
LARGE_WRITE_REQS NUMBER NOT NULL Number of multiblock write requests
NUMBER_OF_WAITS NUMBER NOT NULL Number of I/O waits by functionality
WAIT_TIME NUMBER NOT NULL Total wait time (in milliseconds)

 

 

   
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