Re: MusicBrainz postgres performance issues

On 3/15/2015 6:54 AM, Robert Kaye wrote:
> Hi!
>
> We at MusicBrainz have been having trouble with our Postgres install
> for the past few days. I’ve collected all the relevant information here:
>
> http://blog.musicbrainz.org/2015/03/15/postgres-troubles/
>
> If anyone could provide tips, suggestions or other relevant advice for
> what to poke at next, we would love it.
Robert,

Wow - You've engaged the wizards indeed.

I haven't heard or seen anything that would answer my *second* question
if faced with this (my first would have been "what changed")....

What is the database actually trying to do when it spikes? e.g. what
queries are running ?
Is there any pattern in the specific activity (exactly the same query,
or same query different data, or even just same tables, and/or same
users, same apps) when it spikes?

I know from experience that well behaved queries can stop being well
behaved if underlying data changes

and for the experts... what would a corrupt index do to memory usage?

Roxanne