-----Original Message-----
From: Isabella Ghiurea [mailto:isabella.ghiu...@nrc-cnrc.gc.ca] 
Sent: Wednesday, January 10, 2018 10:48 AM
To: pgsql-performa...@postgresql.org
Subject: RE: PG 9.5 2 tables same DDL with diff size

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I run full vacuum and reindex on largest table (50GB) while there was no server 
activities  so I assume no transaction was holding a lock on table since the 
full vacuum was able to run, anything where I should consider looking ?


Yes, in  pg_stat_activity look for idle transactions that started long time ago.
To prevent vacuum from doing its job they don't need to lock the table, they 
could just prevent from cleaning "old" row versions.

Igor Neyman

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