On Wed, Mar 22, 2006 at 01:08:34PM +0000, Simon Riggs wrote: > On Wed, 2006-03-22 at 06:47 -0600, Jim C. Nasby wrote: > > > Also, why do we log rows for CTAS/SELECT INTO when PITR is in use for > > simple SELECTs (ones that don't call non-deterministic functions)? The > > data should alread be available AFAICS... > > Not sure what you're asking... SELECTs don't produce WAL. Yes, there'd have to be some special kind of WAL entry that specifies what select statement was used in CTAS. > PITR wants all changes. Without PITR we can optimise certain logging > actions. The only change here is that we're creating a new table based on the results of a SELECT. If that SELECT doesn't use anything that's non-deterministic, then the machine doing the recovery should already have all the data it needs, provided that we log the SELECT that was used in the CTAS. -- Jim C. Nasby, Sr. Engineering Consultant jnasby@xxxxxxxxxxxxx Pervasive Software http://pervasive.com work: 512-231-6117 vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
