Here's a patch to clarify the BRIN indexes documentation, particularly with regards
to autosummarize, vacuum and autovacuum. It basically breaks down a big blob of a
paragraph into multiple paragraphs for clarity, plus explicitly tells how summarization
happens manually or automatically.
I also added cross-references to various relevant sections, including the create index
page.
On this topic... I'm not familiar with with the internals of BRIN indexes and in
backend/access/common/reloptions.c I see:
{
"autosummarize",
"Enables automatic summarization on this BRIN index",
RELOPT_KIND_BRIN,
AccessExclusiveLock
},
Is the exclusive lock on the index why autosummarize is off by default?
What would be the downside (if any) of having autosummarize=on by default?
Roberto
--
Crunchy Data - passion for open source PostgreSQL
