[PERFORM] Why is my pg_xlog directory so huge?

2013-03-18 Thread Niels Kristian Schjødt
After installing my new server I just discovered something that doesn't seem right: sudo du -h /var/lib/postgresql/9.2/main 4.0K/var/lib/postgresql/9.2/main/pg_snapshots 4.0K/var/lib/postgresql/9.2/main/pg_serial 4.0K/var/lib/postgresql/9.2/main/pg_tblspc 29M

Re: [PERFORM] Why is my pg_xlog directory so huge?

2013-03-18 Thread Magnus Hagander
On Mon, Mar 18, 2013 at 10:14 AM, Niels Kristian Schjødt nielskrist...@autouncle.com wrote: After installing my new server I just discovered something that doesn't seem right: sudo du -h /var/lib/postgresql/9.2/main snip As you can see the pg_xlog folder is 202G, which is more than my

Re: [PERFORM] Why is my pg_xlog directory so huge?

2013-03-18 Thread Niels Kristian Schjødt
Okay, thanks. It' seems you were right! Now I have fixed the issue (it was an ssh key). So I started a: SELECT pg_start_backup('backup', true); And when done, I executed a: sudo -u postgres rsync -av --exclude postmaster.pid --exclude pg_xlog /var/lib/postgresql/9.2/main/

Re: [PERFORM] Why is my pg_xlog directory so huge?

2013-03-18 Thread Niels Kristian Schjødt
Thanks! it worked! :-) Den 18/03/2013 kl. 15.38 skrev Magnus Hagander mag...@hagander.net: On Mon, Mar 18, 2013 at 2:08 PM, Niels Kristian Schjødt nielskrist...@autouncle.com wrote: Okay, thanks. It' seems you were right! Now I have fixed the issue (it was an ssh key). So I started a:

[PERFORM] effective_cache_size on 32-bits postgres

2013-03-18 Thread Rodrigo Barboza
Hi guys, I am worried about the effective_cache_size. I run a 32-bits postgres installation on a machine with 64 bits kernel. Should I limit effective_cache_size to a maximum of 2.5gb?

Re: [PERFORM] effective_cache_size on 32-bits postgres

2013-03-18 Thread Rob Wultsch
On Mon, Mar 18, 2013 at 10:53 AM, Rodrigo Barboza rodrigombu...@gmail.com wrote: Hi guys, I am worried about the effective_cache_size. I run a 32-bits postgres installation on a machine with 64 bits kernel. Should I limit effective_cache_size to a maximum of 2.5gb? That variables refers to fs

Re: [PERFORM] effective_cache_size on 32-bits postgres

2013-03-18 Thread Pavel Stehule
Hello 2013/3/18 Rodrigo Barboza rodrigombu...@gmail.com: Hi guys, I am worried about the effective_cache_size. I run a 32-bits postgres installation on a machine with 64 bits kernel. Should I limit effective_cache_size to a maximum of 2.5gb? sure and probably little bit less Regards Pavel

Re: [PERFORM] effective_cache_size on 32-bits postgres

2013-03-18 Thread Rodrigo Barboza
Ok, now I'm lost, who is right about the limit? Rob or Pavel? Rob, I know it should be a 64 bit, and it will be soon, but there are good reasons for this scenario and it's ok for now. On Mon, Mar 18, 2013 at 3:15 PM, Pavel Stehule pavel.steh...@gmail.comwrote: Hello 2013/3/18 Rodrigo

Re: [PERFORM] effective_cache_size on 32-bits postgres

2013-03-18 Thread Pavel Stehule
2013/3/18 Pavel Stehule pavel.steh...@gmail.com: Hello 2013/3/18 Rodrigo Barboza rodrigombu...@gmail.com: Hi guys, I am worried about the effective_cache_size. I run a 32-bits postgres installation on a machine with 64 bits kernel. Should I limit effective_cache_size to a maximum of 2.5gb?

Re: [PERFORM] effective_cache_size on 32-bits postgres

2013-03-18 Thread Rodrigo Barboza
So setting this as half of ram, as suggested in postgres tuning webpage should be safe? It says it is a conservative value... On Mon, Mar 18, 2013 at 3:18 PM, Pavel Stehule pavel.steh...@gmail.comwrote: 2013/3/18 Pavel Stehule pavel.steh...@gmail.com: Hello 2013/3/18 Rodrigo Barboza

Re: [PERFORM] effective_cache_size on 32-bits postgres

2013-03-18 Thread Kevin Grittner
Rodrigo Barboza rodrigombu...@gmail.com wrote: So setting this as half of ram, as suggested in postgres tuning webpage should be safe? Half of RAM is likely to be a very bad setting for any work load. It will tend to result in the highest possible number of pages duplicated in PostgreSQL and

Re: [PERFORM] effective_cache_size on 32-bits postgres

2013-03-18 Thread Claudio Freire
On Mon, Mar 18, 2013 at 3:47 PM, Kevin Grittner kgri...@ymail.com wrote: Rodrigo Barboza rodrigombu...@gmail.com wrote: So setting this as half of ram, as suggested in postgres tuning webpage should be safe? Half of RAM is likely to be a very bad setting for any work load. It will tend to

Re: [PERFORM] effective_cache_size on 32-bits postgres

2013-03-18 Thread Pavel Stehule
2013/3/18 Kevin Grittner kgri...@ymail.com: Rodrigo Barboza rodrigombu...@gmail.com wrote: So setting this as half of ram, as suggested in postgres tuning webpage should be safe? Half of RAM is likely to be a very bad setting for any work load. It will tend to result in the highest possible