Re: [PERFORM] free space map usage
On Tue, 2003-10-14 at 15:43, Jeremy M. Guthrie wrote:
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On Tuesday 14 October 2003 02:16 pm, Tom Lane wrote:
Jeremy M. Guthrie [EMAIL PROTECTED] writes:
Is there any way to determine how much of the free space map is currently
i= n=20
use?(ie. where and what it is tracking?) I vacuum on a regular basis but
I= =20
never hold in terms of disk space usage.
Not in 7.3 AFAIR. In 7.4 a full-database VACUUM VERBOSE will end with
the info you want:
regression=# vacuum verbose;
... much cruft ...
INFO: free space map: 11 relations, 144 pages stored; 272 total pages
needed DETAIL: Allocated FSM size: 1000 relations + 2 pages = 178 kB
shared memory. VACUUM
regression=#
This tells me I'm only using about 1% of the FSM space (272 out of 2
page slots).
I jacked up the free space map=20
pages but this doesn't appear to be working.
You know you have to restart the postmaster to make those changes take
effect, right?
Yup. I still see no effect after restart.
Given that you knew of no way to determine how much free space map you
were using, what is your criteria for it to appear to be working? If
it's that space keeps growing, then your probably not vacuuming
frequently enough.
Robert Treat
--
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Re: [PERFORM] free space map usage
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Tuesday 14 October 2003 02:16 pm, Tom Lane wrote: Jeremy M. Guthrie [EMAIL PROTECTED] writes: Is there any way to determine how much of the free space map is currently i= n=20 use?(ie. where and what it is tracking?) I vacuum on a regular basis but I= =20 never hold in terms of disk space usage. Not in 7.3 AFAIR. In 7.4 a full-database VACUUM VERBOSE will end with the info you want: regression=# vacuum verbose; ... much cruft ... INFO: free space map: 11 relations, 144 pages stored; 272 total pages needed DETAIL: Allocated FSM size: 1000 relations + 2 pages = 178 kB shared memory. VACUUM regression=# This tells me I'm only using about 1% of the FSM space (272 out of 2 page slots). I jacked up the free space map=20 pages but this doesn't appear to be working. You know you have to restart the postmaster to make those changes take effect, right? Yup. I still see no effect after restart. regards, tom lane - -- Jeremy M. Guthrie Systems Engineer Berbee 5520 Research Park Dr. Madison, WI 53711 Phone: 608-298-1061 Berbee...Decade 1. 1993-2003 -BEGIN PGP SIGNATURE- Version: GnuPG v1.2.2 (GNU/Linux) iD8DBQE/jFH8qtjaBHGZBeURAkKkAJ0cDa31C4VKxlHoByFaGY3EtQwMdwCgmA5k +Z9GUE3l7LIJVl9rII7d3TU= =gkIR -END PGP SIGNATURE- ---(end of broadcast)--- TIP 4: Don't 'kill -9' the postmaster
[PERFORM] free space map usage
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Is there any way to determine how much of the free space map is currently in use?(ie. where and what it is tracking?) I vacuum on a regular basis but I never hold in terms of disk space usage. I jacked up the free space map pages but this doesn't appear to be working. shared_buffers = 29400# 2*max_connections, min 16 max_fsm_relations = 1000# min 10, fsm is free space map max_fsm_pages = 1000 # min 1000, fsm is free space map - -- Jeremy M. Guthrie Systems Engineer Berbee 5520 Research Park Dr. Madison, WI 53711 Phone: 608-298-1061 Berbee...Decade 1. 1993-2003 -BEGIN PGP SIGNATURE- Version: GnuPG v1.2.2 (GNU/Linux) iD8DBQE/jCo4qtjaBHGZBeURAj9EAKCL+tiioPO5K1YM1sn62yS0L1Ry5QCfVifq 22s22gFNFHAHquS+iiUZO6s= =AQ2Y -END PGP SIGNATURE- attachment: archive.png ---(end of broadcast)--- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
Re: [PERFORM] free space map usage
Jeremy M. Guthrie [EMAIL PROTECTED] writes: Is there any way to determine how much of the free space map is currently i= n=20 use?(ie. where and what it is tracking?) I vacuum on a regular basis but I= =20 never hold in terms of disk space usage. Not in 7.3 AFAIR. In 7.4 a full-database VACUUM VERBOSE will end with the info you want: regression=# vacuum verbose; ... much cruft ... INFO: free space map: 11 relations, 144 pages stored; 272 total pages needed DETAIL: Allocated FSM size: 1000 relations + 2 pages = 178 kB shared memory. VACUUM regression=# This tells me I'm only using about 1% of the FSM space (272 out of 2 page slots). I jacked up the free space map=20 pages but this doesn't appear to be working. You know you have to restart the postmaster to make those changes take effect, right? regards, tom lane ---(end of broadcast)--- TIP 6: Have you searched our list archives? http://archives.postgresql.org
