On Tue, Sep 18, 2007 at 06:51:04PM +0200, Guillaume Smet wrote: > Hi all, > > As we will soon enter beta, I decided to give a try to 8.3devel. The > first step is of course to load a dump from an existing database. > > The dump is a text dump of 1.6 GB (database is approximately 4 GB). > > The restore is far slower than with 8.2. From time to time ALTER TABLE > queries creating primary keys are waiting for a long time. After a > while, I discovered that that I had three autovacuum processes which > were running to analyze the created tables while the dump was trying > to create primary keys on these very tables. > > While I understand that it's important to have a fully analyzed > database, I usually do it at the end of the restore and the fact that > three tables are analyzed concurrently while primary keys are created > is far from optimal IMHO as primary keys creation often (*really* > often in my case) waits for autovacuum to finish its job.
Odd... I'd expect it to actually be beneficial to run analyze on a table at roughly the same time as PK building, because you'd make better use of cache. OTOH, unless something's changed, analyze should read at most 30k pages, which I wouldn't expect to take all that long... -- Decibel!, aka Jim C. Nasby, Database Architect [EMAIL PROTECTED] Give your computer some brain candy! www.distributed.net Team #1828
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