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Don Burleson Blog 







 alter table monitoring Tips

Oracle Database Tips by Donald BurlesonMarch 7, 2015

Question:  I need to monitor my tables for stale optimizer statistics, and I understand that the alter table monitoring clause will allow Oracle to detect when a table need to be re-analyze with dbms_stats, thereby keeping my statistics fresh.  How do I use alter table monitoring, and how do I tell that my tables and indexes are being monitored?

Answer:  Prior to 11g, alter table xxx monitoring tracks the approximate number of DML statements against the table since the last time statistics were gathered. Information about how many rows are affected is maintained in the SGA, until periodically (about every three hours) SMON incorporates the data into the data dictionary. Oracle has the dba_tab_modifications view to see these DML updates..

An example of the "alter table xxx monitoring" clause is below, a script to tell when a table or index is not being monitored:

   monitoring = 'NO'
order by

group by
order by
   last_analyzed desc;

-- *****************************
prompt un-analyzed tables
-- ****************************
   last_analyzed is NULL;

Important Note!  Starting with 11g and beyond, the alter table monitoring clause been deprecated and statistics are collected automatically. Even if you do specify alter table xxx monitoring, it is ignored.

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