Re: pg_relation_size performance issue - Mailing list pgsql-general
I'm not sure why you are adding toast to table size, since pg_relation_size already does that.
http://www.postgresql.org/docs/9.3/interactive/functions-admin.html
This query might work better and faster for you.http://www.postgresql.org/docs/9.3/interactive/functions-admin.html
SELECT n.nspname as schema,
c.relname as table,
a.rolname as owner,
c.relfilenode as filename,
c.reltuples::integer,
pg_size_pretty(pg_relation_size( quote_ident( n.nspname ) || '.' || quote_ident( c.relname ) )) as size,
pg_size_pretty(pg_total_relation_size( quote_ident( n.nspname ) || '.' || quote_ident( c.relname ) )) as total_size,
pg_relation_size( quote_ident( n.nspname ) || '.' || quote_ident( c.relname ) ) as size_bytes,
pg_total_relation_size( quote_ident( n.nspname ) || '.' || quote_ident( c.relname ) ) as total_size_bytes,
CASE WHEN c.reltablespace = 0
THEN 'pg_default'
ELSE (SELECT t.spcname
FROM pg_tablespace t WHERE (t.oid = c.reltablespace) )
END as tablespace
FROM pg_class c
JOIN pg_namespace n ON (n.oid = c.relnamespace)
JOIN pg_authid a ON ( a.oid = c.relowner )
WHERE c.relname = 'sensor'
AND n.nspname = 'devtest';
On Thu, Jun 4, 2015 at 9:50 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
Hans Guijt <hg@terma.com> writes:
> I have a Postgres 9.3.7 database, freshly created on Ubuntu 14 LTS 64 bit, and at this time almost completely empty. I'm attempting to find the size of a table, using the following code:
> SELECT
> pg_relation_size (stat.relid),
> CASE WHEN cl.reltoastrelid = 0 THEN
> 0
> ELSE
> pg_relation_size (cl.reltoastrelid) + COALESCE ((
> SELECT SUM (pg_relation_size (indexrelid)) FROM pg_index WHERE indrelid=cl.reltoastrelid
> ), 0)::int8
> END,
> COALESCE ((SELECT SUM (pg_relation_size (indexrelid)) FROM pg_index WHERE indrelid=stat.relid), 0)::int8
> FROM pg_stat_all_tables stat
> JOIN pg_class cl ON cl.oid=stat.relid
> JOIN pg_namespace ns ON cl.relnamespace=ns.oid
> WHERE UPPER (cl.relname) = UPPER ('sensor')
> AND UPPER (ns.nspname) = UPPER ('devtest')
Getting rid of the useless join to pg_stat_all_tables would probably help;
there's a lot of computation in that view.
regards, tom lane
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