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Hi, I did pg_dump of a ~20TB database followed by pg_restore. I find simple queries like select count(*) running slow. I did a select count(*) on all tables before pg_dump which took ~4 hours. After pg_restore,
same thing took 32 hours. I ran “analyze verbose ;” on the database, but it did not help. It ran quick in 1.5 hours, but as you are aware it does sampling. I am now running “vacuumdb -p <port-number> -a -z -j 10 -v”, but I do not know if it is going to help. I am not sure if above vacuumdb helps, but if it helps what is it vacuuming in a pristine database? If it is doing some special “analyze”, what is it? Is there a way to run “full” analyze without sampling
and without vacuuming? By the way, there is no change in postgres versions. It is 14.4 before and after pg_restore. Thanks! |
