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SQL Analyze DBMS_STATS control the queries

in Database Administration (MOSC) 5 commentsAnswered

Greetings,

I have a bigger OLTP 19c DB in a RAC environment.

What I have noticed, is that my servers get soon out of memory because of stats gathering (parallel jobs) during batch loads.

I notice in those peaks that I see many queries like this one below:

/* SQL Analyze(1) */ select /*+ full(t)   parallel(t,4) parallel_index(t,4) dbms_stats cursor_sha

I guess I cannot change/influence that behaviour. Maybe Oracle triggers that during the batch jobs to get a fresh statistics ?

I have seen in some MOS articles that it uses ESTIMATE_PERCENT DBMS_STATS.AUTO_SAMPLE_SIZE to work on this one?

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