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Within the latest (12, 13) versions of PostgreSQL, is there any throttling support on the user-account level, to limit how much data any query can produce and/or how much time + memory it may consume under that user account?

I want to limit specific user accounts to allow up to certain amount of data and/or time to consume within the server, before erroring with "query quota exceeded" or something like that.

Example

I want to configure user account guest to produce "quota exceeded" failure for any query that returns more than 10kb of data or takes more than 10 seconds to execute.

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    No, there is no such feature in Postgres. The only way you could get a filesystem quota is to use a tablespace on a really small disk and assign that to the guest user.
    – user1822
    Oct 19, 2020 at 12:36
  • I suppose that means I would have to provide extra LIMIT logic for each query to implement the data size requirements. But as for the timing requirements, is there anything usable?
    – vitaly-t
    Oct 19, 2020 at 12:40

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There is no support for resource quotas in PostgreSQL.

Your best bet is statement_timeout:

ALTER ROLE baduser SET statement_timeout = '10s';

You cannot limit the number of rows returned, but perhaps statement_timeout is good enough.

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