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DBMS_STATS - Gathering Statistics

edited Sep 23, 2016 5:00AM in SQL Performance (MOSC) 5 commentsAnswered

I'm a little confused with "Gathering Statistics". If some one could answer the following questions I think it would help me a lot. All these questions refer to the SYS job "GATHER_STAT_JOB"

1) What tables are 'analyzed' ? When I look at the properties of a table, I see "Last Analyzed - date", but I have many tables that are not analyzed at all.

2) I am not sure if this assumption(s) is correct: "If a table has not been analyzed, the table has not changed" or "If a table has not changed (insert,update,delete), then it does not need to be analyzed"

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