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Well, so my requirement this time was to get the size of all tables in a particular schema. HOW?

AFAIK, there was no direct way to fulfill my requirement. So wrote my own query..

SELECT pg_size_pretty(sum(pg_total_relation_size(‘archival.’||table_name))::bigint)
FROM information_schema.tables
WHERE table_schema=’archival’;

Where ‘archival’ is the schema name. Checkout the type-casting.
Short explanation: sum() returns int type, but pg_size_pretty() takes bigint as the param data type. Hence the type casting.

NB:- when copying the query, take care of the quotes.

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