List all databases in Postgres and their (byte/human) sizes, ordering by byte size descending

psql -c "SELECT pg_database.datname, pg_database_size(pg_database.datname), pg_size_pretty(pg_database_size(pg_database.datname)) FROM pg_database ORDER BY pg_database_size DESC;" -d <ANYDBNAME>
Get a listing of all of your databases in Postgres and their sizes, ordering by the largest size first. Requires that you give the -d parameter a valid database name that you can connect to.
Sample Output
      datname      | pg_database_size | pg_size_pretty 
-------------------+------------------+----------------
 db6           |        872167184 | 832 MB
 db2           |        753399568 | 718 MB
 db5           |        500832016 | 478 MB
 db3           |        456202000 | 435 MB
 db4           |        446600976 | 426 MB
 db1           |        442472208 | 422 MB
(6 rows)

4
By: bbbco
2011-11-30 15:22:48

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What Others Think

Handy! And you can skip the "-d " part if you have a default database set with your PGDATABASE, PGHOST, and PGUSER environment variables.
splante · 342 weeks and 2 days ago
True, thanks for the tip! We do not have a default database assigned on the server I was attempting to get this type of info from. I figured that specifying the database name would ensure that users would get the output regardless. If you have to, you could also add something to the beginning like this to pull the first db name: e=$(psql -lAt | head -n1 | cut -d\| -f1); psql -c "SELECT pg_database.datname, pg_database_size(pg_database.datname), pg_size_pretty(pg_database_size(pg_database.datname)) FROM pg_database ORDER BY pg_database_size DESC;" -d ${e}
bbbco · 342 weeks and 2 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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