Marinos Yannikos wrote: > Hello, > > we're looking into the reason why we are getting warnings about > transaction ID wraparound despite a daily "vaccumdb -qaz". Someone is > claiming that VACUUM without FULL cannot reassign XIDs properly when > max_fsm_pages was set too low (it says so here too, but this is rather > old: http://www.varlena.com/GeneralBits/Tidbits/perf.html#maxfsmp). Is > this true, or do we have a different issue here? We're using 8.1.3 with > a database generated on 8.1.3 (i.e. not migrated from 7.x or anything > like that). It's not true. Having shortage of FSM entries will make you lose space, but it will be able to recycle Xids anyway. I guess your problem is that you're not vacuuming all databases for some reason. I'd advise to lose the -q and make sure you're not redirecting to somewhere you can't read the log; the read the log and make sure everything is going fine. What's the warning anyway? Does it say that wraparound point is nearing, or does it merely say that it is on Xid <some number here> and you don't know how far that number actually is? -- Alvaro Herrera http://www.CommandPrompt.com/ The PostgreSQL Company - Command Prompt, Inc.
