Re: [GENERAL] a few questions on backup

2007-05-19 Thread Marco Colombo
Marco Colombo wrote: > I'll try that out. Maybe my ideas are so far from the truth that I'm > having a hard time in explaing them to people who actually know how > things work. I'll be back with results. Meanwhile, thanks for your time. I think I finally got it. Segment 34 in my pg_xlog got archi

Re: [GENERAL] a few questions on backup

2007-05-16 Thread Marco Colombo
Tom Lane wrote: > Marco Colombo <[EMAIL PROTECTED]> writes: >> Good to know, thanks. I think I'll experiment a bit with >> archive_command. My point was that since I know (or better assume) that >> old segments are going to stay in my pg_xlog for *days* before getting >> recycled, > > On what do y

Re: [GENERAL] a few questions on backup

2007-05-16 Thread Tom Lane
Marco Colombo <[EMAIL PROTECTED]> writes: > Good to know, thanks. I think I'll experiment a bit with > archive_command. My point was that since I know (or better assume) that > old segments are going to stay in my pg_xlog for *days* before getting > recycled, On what do you base that assumption?

Re: [GENERAL] a few questions on backup

2007-05-15 Thread Marco Colombo
Richard Huxton wrote: > It calls archive_command on the just-filled one. Good to know, thanks. I think I'll experiment a bit with archive_command. My point was that since I know (or better assume) that old segments are going to stay in my pg_xlog for *days* before getting recycled, just copying th

Re: [GENERAL] a few questions on backup

2007-05-15 Thread Prashant Ranjalkar
Hi, The procedure you followed is for online backups. The backups are useless unless you set archive_command in your postgresql.conf file. This command will copy the filled transaction log to a directory where you specified in your archive_command. The PG won't write to transaction logs unless it

Re: [GENERAL] a few questions on backup

2007-05-15 Thread Richard Huxton
Marco Colombo wrote: Mmm, sorry I'm not sure I'm following here. Maybe I should provide some background. In my pg_xlog directory I see five files, WAL segments, I suppose. Only one (as I expected) is begin currently used, the others are old (one a couple of days old). When PG performs a switch f

Re: [GENERAL] a few questions on backup

2007-05-15 Thread Marco Colombo
Tom Lane wrote: > No. You have to have an actual archive_command script copying the WAL > segments somewhere else when told to. An asynchronous copy of the xlog > directory will be nothing but garbage, because we recycle WAL segments > as fast as we can (ie, as soon as the archive_command claims

Re: [GENERAL] a few questions on backup

2007-05-14 Thread Hannes Dorbath
On 14.05.2007 16:54, Marco Colombo wrote: I have a few questions on backuping a PostgreSQL server (lets say anything 8.x.x). I've read "Continuous Archiving and Point-In-Time Recovery (PITR)" in the manual I'm still missing something...well actually I think I don't but I've been debating on this

Re: [GENERAL] a few questions on backup

2007-05-14 Thread Tom Lane
Marco Colombo <[EMAIL PROTECTED]> writes: > Am I right in assuming that the following procedure is ok? > 1) issue pg_start_backup(); > 2) copy (or tar or cpio) the data dir, w/o pg_xlog/ > 3) issue pg_stop_backup(); > 4) copy (or tar or cpio) pg_xlog/ contents. No. You have to have an actual arc

[GENERAL] a few questions on backup

2007-05-14 Thread Marco Colombo
Hello, I have a few questions on backuping a PostgreSQL server (lets say anything 8.x.x). I've read "Continuous Archiving and Point-In-Time Recovery (PITR)" in the manual I'm still missing something...well actually I think I don't but I've been debating on this with a friend for a while, and there'