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Re: Different execution plan between PostgreSQL 8.4 and 12.11

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: gzh <gzhcoder@126.com>
Cc: pgsql-general@lists.postgresql.org
Date: 2022-10-09T16:02:09Z
Lists: pgsql-general 
gzh <gzhcoder@126.com> writes:
> I run following sql in PostgreSQL 8.4 and PostgreSQL 12.11, it returns different execution plan.

Have you done an ANALYZE in the new database?  The rowcount estimates
seem a lot different, leading me to guess that the newer installation
doesn't have good statistics yet.

			regards, tom lane

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  1. Use Limit instead of Unique to implement DISTINCT, when possible