Re: Monitoring DB size

Slightly different approach than you might expect. For larger DBs you'd
likely want to exclude base and instead use pg_database_size() in addition.

postgres(2454884) =# create temp table xx(dir text, sz bigint);
CREATE TABLE
Time: 2.587 ms
postgres(2454884) =# copy xx(sz, dir) from program 'du -s *';

COPY 21
Time: 3.793 ms
postgres(2454884) =# select * from xx;
dir | sz
----------------------+-------
base | 26280
global | 568
pg_commit_ts | 12
pg_dynshmem | 4
pg_logical | 16
pg_multixact | 28
pg_notify | 4
pg_replslot | 4
pg_serial | 4
pg_snapshots | 4
pg_stat | 4
pg_stat_tmp | 4
pg_subtrans | 12
pg_tblspc | 4
pg_twophase | 4
PG_VERSION | 4
pg_wal | 16392
pg_xact | 12
postgresql.auto.conf | 4
postmaster.opts | 4
postmaster.pid | 4
(21 rows)

Time: 0.282 ms

On Mon, Jul 15, 2024 at 4:42 PM Shenavai, Manuel <manuel(dot)shenavai(at)sap(dot)com>
wrote:

> Hi everyone,
>
>
>
> we currently capture the db size (pg_database_size) which gives the “Disk
> space used by the database with the specified name”. Is it possible to
> further split this data how much space is occupied by live tuples, dead
> tuples and free space?
>
>
>
> We would like to have something like:
>
> DB Size: 200 MB, live tuple 100MB, Dead Tuple: 20 MB, free space 80MB
>
>
>
> Is this possible?
>
>
>
> Best regards,
>
> Manuel
>