RE: pg_upgrade —link does it remove table bloat

>What is your concern, storage space or performance of queries?

>If performance then an EXPLAIN ANALYZE on a query will help show whether there is an issue or not.

@Adrian Klaver I guess I am after both, I would like to squeeze the most performance out of my tables and installation as possible. Also I would like to save space wherever possible. I have received a *bloat* load of information in this thread, so thanks. 😊

@Michael Lewis thanks for the idea of pg_repack, this looks awesome and I cant wait to test it.

Jason Ralph

-----Original Message-----
From: Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com>
Sent: Thursday, February 13, 2020 6:21 PM
To: Jason Ralph <jralph(at)affinitysolutions(dot)com>; Michael Lewis <mlewis(at)entrata(dot)com>
Cc: pgsql-general(at)lists(dot)postgresql(dot)org
Subject: Re: pg_upgrade —link does it remove table bloat

On 2/13/20 12:45 PM, Jason Ralph wrote:
> @Adrian Klaver,
> I was concerned with the 1.4 value of tbloat and wastedbytes value, then again the last autovacuum was at 2020-02-13 02:25:22.533372-05 and I took this snapshot at 3:44PMEST. So it may be ok, what do you think?

What is your concern, storage space or performance of queries?

If performance then an EXPLAIN ANALYZE on a query will help show whether there is an issue or not.

>
>
> current_database | schemaname | tablename | tbloat | wastedbytes | iname | ibloat | wastedibytes
> notimportant | public | members | 1.4 | 3080314880 | members_cobrid | 0.2 | 0
>
>
>
>
>
> notimportant=# select * from pg_stat_user_tables where relname =
> 'members'; -[ RECORD 1 ]-------+------------------------------
> relid | 2045245
> schemaname | public
> relname | members
> seq_scan | 55065
> seq_tup_read | 201069350222
> idx_scan | 5349501175
> idx_tup_fetch | 7201402647
> n_tup_ins | 910616
> n_tup_upd | 46730942
> n_tup_del | 1
> n_tup_hot_upd | 41845682
> n_live_tup | 18262438
> n_dead_tup | 14740
> n_mod_since_analyze | 2476
> last_vacuum | 2019-10-13 01:01:40.587534-04
> last_autovacuum | 2020-02-13 02:25:22.533372-05
> last_analyze | 2019-10-13 01:01:41.916929-04
> last_autoanalyze | 2020-02-13 13:44:46.273096-05
> vacuum_count | 15
> autovacuum_count | 92
> analyze_count | 15
> autoanalyze_count | 243
>
> Jason Ralph
>

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com
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