I am facing problem in tracing in what events the selectivity histogram in pg_statistic is stored/updated.
I went through the code in src/backend/commands/analyze.c and got to see the code computing the histogram but when I tried to trace the caller of analyze_rel or compute_index_stats, I find out that only during Vaccum command, these functions are invoked. I am little surprised as I did get to see PostgreSQL giving good selectivity estimations despite me running Vaccuum command even once. I did try to trace the control flow during table operations (creation / insertion) but couldn't find any histogram updation functions being invoked though I did get to know that some functions related to catalog updations is being invoked. Can anybody tell me in what all events is the pg_statistic table exactly updated? -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
