It occurs to me that this is very similar to the method I proposed in June to enforce a hard limit on WAL usage, to avoid PANIC caused by running out of disk space when writing WAL:

http://www.postgresql.org/message-id/51b095fe.6050...@vmware.com

Enforcing a global limit needs more book-keeping than rate limiting individual sesssions. But I'm hoping that the CHECK_WAL_BUDGET() calls could be used for both purposes.

- Heikki


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