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 dba_hist_wr_control tips

Oracle Database Tips by Donald BurlesonMarch 17, 2015

Question:  How do I use the dba_hist_wr_control table to manage my SYSAUX tablespace?

Answer:  The dba_hist_wr_control is the workload repository control table that table shows the AWR snapshot settings, namely the snapshot interval, the retention period and the top-x-sql collection threshold:

SQL> desc dba_hist_wr_control

Name Null? Type
------------------------------- -------- ----------------------------
DBID                            NOT NULL NUMBER
SNAP_INTERVAL                   NOT NULL INTERVAL DAY(5) TO SECOND(1)
RETENTION                       NOT NULL INTERVAL DAY(5) TO SECOND(1)
TOPNSQL                                  VARCHAR2(10)

The dba_hist_wr_control table is used to see your AWR data retention period:

select
   snap_interval,
   retention
from
   dba_hist_wr_control;

-- ********************************************

select
  extract( day from snap_interval) *24*60+
  extract( hour from snap_interval) *60+
  extract( minute from snap_interval ) "Snapshot Interval",
  extract( day from retention) *24*60+
  extract( hour from retention) *60+
  extract( minute from retention ) "Retention Interval"
from
   dba_hist_wr_control;

For complete AWR retention scripts using dba_hist_wr_control, download the Oracle Script Collection.

See my notes on adjusting the AWR retention period. However, beware that you may want to selectively truncate AWR tables while leaving the "major" statistics for long-term trend analysis. 

These periodic truncates are for the SQL tables, so I disable AWR data purging and manually truncate tables such as the dba_hist_sqlstat tables.  See how to periodically truncate the SQL tables from AWR.

Remember that AWR is extra-cost and STATSPACK is free.  Also see my notes on removing AWR.

Also note that SYSAUX tablespace size can be estimated using the script utlsyxsz.sql.

SQL> @$ORACLE_HOME/rdbms/admin/utlsyxsz.sql

   
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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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