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

Terminal - 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>
2011-11-30 15:22:48
User: bbbco
4
List all databases in Postgres and their (byte/human) sizes, ordering by byte size descending

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.

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Terminal - Alternatives

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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.

Comment by splante 155 weeks and 5 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}
Comment by bbbco 155 weeks and 5 days ago

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