Postgres DB Size Command

What is the command to find the size of all the databases?

I am able to find the size of a specific database by using following command:

select pg_database_size('databaseName'); 

10 Answers

You can enter the following psql meta-command to get some details about a specified database, including its size:

\l+ <database_name> 

And to get sizes of all databases (that you can connect to):

\l+ 

You can get the names of all the databases that you can connect to from the "pg_datbase" system table. Just apply the function to the names, as below.

select t1.datname AS db_name, pg_size_pretty(pg_database_size(t1.datname)) as db_size from pg_database t1 order by pg_database_size(t1.datname) desc; 

If you intend the output to be consumed by a machine instead of a human, you can cut the pg_size_pretty() function.

-- Database Size SELECT pg_size_pretty(pg_database_size('Database Name')); -- Table Size SELECT pg_size_pretty(pg_relation_size('table_name')); 

Based on the answer here by @Hendy Irawan

Show database sizes:

\l+

e.g.

=> \l+ berbatik_prd_commerce | berbatik_prd | UTF8 | en_US.UTF-8 | en_US.UTF-8 | | 19 MB | pg_default | berbatik_stg_commerce | berbatik_stg | UTF8 | en_US.UTF-8 | en_US.UTF-8 | | 8633 kB | pg_default | bursasajadah_prd | bursasajadah_prd | UTF8 | en_US.UTF-8 | en_US.UTF-8 | | 1122 MB | pg_default | 

Show table sizes:

\d+

e.g.

=> \d+ public | tuneeca_prd | table | tomcat | 8192 bytes | public | tuneeca_stg | table | tomcat | 1464 kB | 

Only works in psql.

Yes, there is a command to find the size of a database in Postgres. It's the following:

SELECT pg_database.datname as "database_name", pg_size_pretty(pg_database_size(pg_database.datname)) AS size_in_mb FROM pg_database ORDER by size_in_mb DESC; 

SELECT pg_size_pretty(pg_database_size('name of database')); 

Will give you the total size of a particular database however I don't think you can do all databases within a server.

However you could do this...

DO $$ DECLARE r RECORD; db_size TEXT; BEGIN FOR r in SELECT datname FROM pg_database WHERE datistemplate = false LOOP db_size:= (SELECT pg_size_pretty(pg_database_size(r.datname))); RAISE NOTICE 'Database:% , Size:%', r.datname , db_size; END LOOP; END; $$ 

From the PostgreSQL wiki.

_{NOTE: Databases to which the user cannot connect are sorted as if they were infinite size.}

SELECT d.datname AS Name, pg_catalog.pg_get_userbyid(d.datdba) AS Owner, CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname)) ELSE 'No Access' END AS Size FROM pg_catalog.pg_database d ORDER BY CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT') THEN pg_catalog.pg_database_size(d.datname) ELSE NULL END DESC -- nulls first LIMIT 20 

The page also has snippets for finding the size of your biggest relations and largest tables.

Start pgAdmin, connect to the server, click on the database name, and select the statistics tab. You will see the size of the database at the bottom of the list.

Then if you click on another database, it stays on the statistics tab so you can easily see many database sizes without much effort. If you open the table list, it shows all tables and their sizes.

You can use below query to find the size of all databases of PostgreSQL.

Reference is taken from this blog.

SELECT datname AS DatabaseName ,pg_catalog.pg_get_userbyid(datdba) AS OwnerName ,CASE WHEN pg_catalog.has_database_privilege(datname, 'CONNECT') THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(datname)) ELSE 'No Access For You' END AS DatabaseSize FROM pg_catalog.pg_database ORDER BY CASE WHEN pg_catalog.has_database_privilege(datname, 'CONNECT') THEN pg_catalog.pg_database_size(datname) ELSE NULL END DESC; 

du -k /var/lib/postgresql/ |sort -n |tail