RE: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade

From: Henrik Cednert (Filmlance) [mailto:henrik(dot)cednert(at)filmlance(dot)se]
Sent: Tuesday, November 21, 2017 11:48 AM
To: pgsql-performance(at)lists(dot)postgresql(dot)org
Subject: Re: pg_dump 3 times as slow after 8.4 -> 9.5 upgrade

I VACUUM every sunday so that is done already. =/

Not sure I have the proper params though since I'm not used to db's but have followed other's "how to's", but these are the lines in my script for that;

${BINARY_PATH}/vacuumdb --analyze --host=localhost --username=postgres --echo --verbose --no-password ${database} | tee -a ${log_pg_optimize}_${database}.log
${BINARY_PATH}/reindexdb --host=localhost --username=postgres --no-password --echo ${database} | tee -a ${log_pg_optimize}_${database}.log

--
Henrik Cednert
cto | compositor

Filmlance International
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To do vacuum full you need to add –full option to your vacuumdb command:

${BINARY_PATH}/vacuumdb --full --analyze --host=localhost --username=postgres --echo --verbose --no-password ${database} | tee -a ${log_pg_optimize}_${database}.log

Just be aware that “vacuum full” locks tables unlike just analyze”. So, like I said, no other acivity during this process.

Regards,
Igor