Sat Sep 24 21:09:19 PDT 2005
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On L, 2005-09-24 at 18:32 +0100, Aldor wrote: > Hi, > > I don't really know how Slony works internally but I know that it uses > some triggers for getting out new transactions. > > The config of my Slony cluster: > > --- CONFIG START --- ... > --- CONFIG END --- > > Of course I have also other tables in the same database, which I don't > want to cluster. When making big data dumps into that tables I noticed > that since I'm using Slony on that database, buf for another table, the > big dumps are getting 5-10 times slower. Are you running this on live db, i.e. are these other tables actively updated and replicated ? How long is the time for loading the dumps ? > The only explanation I have is > that it has maybe something to do with Slony - because nothing else have > been changed. May be Slony do in each row dump of the process any things > which can slow down the process - even if Slony should not care about > this other table?! Slony triggers should not directly affect the tables they are *not* used on. For longer transactions, when tables pg_listener, sl_log_1 and others start to grow into megabytes in size, queries issued by slon can sometimes misbehave, eat tons of CPU, wait for several minutes for locs on pg_listener and do other bad things bogging the whole database down. But this is through secondary effects of *any* long transactions, not the slony *triggers* on unrelated tables. OTOH, you may be just some effects of not having run vacuum or analyse often enough resulting in sharp performance drop, completely unrelated to slony. -- Hannu Krosing <hannu at skype.net>
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