table showing user_tab_modification as bland

If I COUNT (*)
----------
24393594

dba_tab_modificaiotn shows the number of insert/update since the last stat as colleciion
271240 586347 0 15 NOVEMBER 11

That's less than 4% of change to the table. Why is it regarded as expired?

v11.2

Published by: user9198889 on November 15, 2011 16:26

user9198889 wrote:
I read somewhere that dba_tab_modificaiotns reocrds tables with stale statistics. IE was received more than 10% consider since collection las... is false?

DBA_TAB_MODIFICATIONS saves the (approximate) number of changes made to a table, as the statistics were collected. If you use the option BRINGING CORRUPTED in DBMS_STATS, DBMS_STATS reads data in DBA_TAB_MODIFICATIONS as well as existing statistics to determine if statistics on a table are obsolete. If it finds that the statistics are outdated, he collects statistics on the table and resets the data in DBA_TAB_MODIFICATIONS.

The fact that there is an entry in DBA_TAB_MODIFICATIONS simply means that the MONITORING attribute for the table has been defined (default in 11.2 is to monitor the tables).

Justin

Tags: Database

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