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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