Question 291781 in PostgreSQL Question posted in
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Find the sum of tablespaces in PostgreSQL

What I am trying to do is to calculate the sum of the 2 tableSpaces I have in my PostgreSQL DB.

SELECT pg_size_pretty (pg_tablespace_size ('pg_default') );

with this query I am able to find the used space but when I modified it to find the details of both the tablespaces by using below query

SELECT pg_size_pretty ( pg_tablespace_size ('poolData')
                       ,pg_tablespace_size ('pool')    );

but it didn’t gave any output. Is there any way to find both in a single query, so that I can calculate the sum of tablespaces?

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2

Answers


  1. 0

    Function pg_tablespace_size() returns type bigint, so you can add them with a regular +.

    SELECT pg_size_pretty( pg_tablespace_size('poolData')
                      +pg_tablespace_size ('pool')    );

    You can also sum() sizes of tablespaces you’re interested in, fetching them from pg_tablespace.

    select pg_size_pretty(sum(spcname)) from pg_tablespace
where spcname in ('poolData','pool');
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  2. 0

    To be able to find the sum of tablespaces in postgresql in this scenario i would recommend that you use the following query :

    SELECT
  pg_tablespace_size('pg_default') AS pg_default_size,
  pg_tablespace_size('poolData') AS poolData_size,
  pg_tablespace_size('pool') AS pool_size,
  pg_size_pretty(pg_tablespace_size('pg_default') + pg_tablespace_size('poolData') + pg_tablespace_size('pool')) AS total_size;

    The query above retrieves the size of each tablespace individually and then calculates the sum of the sizes.

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