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 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:

select
   table_name,
   monitoring
from
   user_tables 
where
   monitoring = 'NO'
order by
   monitoring;

select
   last_analyzed,
   count(*)
from
   user_indexes
group by
   last_analyzed
order by
   last_analyzed desc;

-- *****************************
prompt un-analyzed tables
-- ****************************
select
   table_name,
   last_analyzed
from
   user_tables
where
   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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