Robert Haas b4d4ce1d50 Increase threshold for multixact member emergency autovac to 50%. ... Analysis by Noah Misch shows that the 25% threshold set by commit 53bb309d2d is lower than any other, similar autovac threshold. While we don't know exactly what value will be optimal for all users, it is better to err a little on the high side than on the low side. A higher value increases the risk that users might exhaust the available space and start seeing errors before autovacuum can clean things up sufficiently, but a user who hits that problem can compensate for it by reducing autovacuum_multixact_freeze_max_age to a value dependent on their average multixact size. On the flip side, if the emergency cap imposed by that patch kicks in too early, the user will experience excessive wraparound scanning and will be unable to mitigate that problem by configuration. The new value will hopefully reduce the risk of such bad experiences while still providing enough headroom to avoid multixact member exhaustion for most users. Along the way, adjust the documentation to reflect the effects of commit 04e6d3b877, which taught autovacuum to run for multixact wraparound even when autovacuum is configured off.		2015-05-11 12:15:50 -04:00
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src	Increase threshold for multixact member emergency autovac to 50%.	2015-05-11 12:15:50 -04:00
bug.template	Stamp HEAD as 9.5devel.	2014-06-10 21:36:13 -04:00
KNOWN_BUGS	Remove extra newlines at end and beginning of files, add missing newlines	2010-08-19 05:57:36 +00:00
Makefile	Remove maintainer-check target, fold into normal build	2013-10-10 20:11:56 -04:00
MISSING_FEATURES	Remove extra newlines at end and beginning of files, add missing newlines	2010-08-19 05:57:36 +00:00
TODO	Update URL.	2008-08-21 20:15:31 +00:00