RE: PG 9.5 2 tables same DDL with diff size

From: Igor Neyman <ineyman(at)perceptron(dot)com>
To: ghiureai <isabella(dot)ghiurea(at)nrc-cnrc(dot)gc(dot)ca>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: RE: PG 9.5 2 tables same DDL with diff size
Date: 2018-01-10 15:14:09
Message-ID: BL2PR17MB0897AB4A9B93B23BE1921F09DA110@BL2PR17MB0897.namprd17.prod.outlook.com
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-----Original Message-----
From: ghiureai [mailto:isabella(dot)ghiurea(at)nrc-cnrc(dot)gc(dot)ca]
Sent: Tuesday, January 09, 2018 5:54 PM
To: pgsql-performance(at)postgresql(dot)org
Subject: PG 9.5 2 tables same DDL with diff size

HI List

I am trying to understand the following :

have 2 identical PG cluster on diff hosts, same postgresql.conf, same db schema :

same tale DDL and row counts but different size ( 14GB diff ), I run reindex and full vacuum analyze, but I can not decrease the size of larger table(50GB) to match the size in second

PG cluster.

any tips what can make this 2 tables to have diff size except the host ( same OS and PG version 9.5.3)?

Thank you
________________________________________________________________________________________________

Table is still bloated because of some long running transactions, which don't allow full vacuum to do its job?

Regards,
Igor Neyman

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