Hello,
at the moment, I am not able to replicate the results posted. Explain analyze results are very similar at the moment on
bothdatabases, query runtime is also almost same.
This has happened after re-running VACUUM ANALYZE VERBOSE. However, right after the migration, I did run the script,
whichwas generated by pg_upgrade script, which should have ran VACUUM on the database, the script name is
analyze_new_cluster.sh.
Maybe after re-running vacuum analyze the statistics somehow changed?
Case closed, thank You.
--
Matúš Svrček
PlainText s.r.o. [www.plaintext.sk]
svrcek@plaintext.sk
----- "Victor Yegorov" <vyegorov@gmail.com> wrote:
> 2014-09-26 17:04 GMT+03:00 Matúš Svrček < svrcek@plaintext.sk > :
>
>
> I am having a performance issue after upgrade from 8.4.20-1 -> 9.3.5.
>
>
> First, make sure you have your statistics up to date — execute manual
> `VACUUM ANALYZE`.
> And then provide `EXPLAIN analyze` for 8.4 and `EXPLAIN (analyze,
> buffers)` for 9.3 output.
>
>
>
> --
> Victor Y. Yegorov
