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Hello everyone,
Yes I know, "size one not fits all", I specifically need:
* preferably multi-master
* local read, cluster-wide write
* a solution that allows me to maintain consistency between masters in
case of single node failure
* last but not
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Hello,
I'll use PG on a dedicated machine with more than 4GB of memory.
The problem is: what would be better to use: PAE ("bigmem" kernels) or
64-bit kernel?
PAE pro: half the memory per pointer, int, etc.
PAE risk: is PG able to take advantage of
Hello everyone,
I have inadvertently set off a furball on an unrelated ng on what is the
actual cost of SQL joins. But there's no reliable conclusion. I would
like to actually know that, that is, are JOINs truly expensive?
As they say, one measurement is worth a thousand opinions, so I've don
Tom Lane wrote:
Do you *know* that relpages was up to date before that? If your system
only does manual vacuums then those numbers probably reflected reality
as of your last vacuum. There are functions that will give you true
file sizes but relpages ain't it.
Oh great. Another catch. What are
Hello everyone,
Is there some guideline for selection of index to use for CLUSTER? This
is rather important as physical table is reorganized according to that
index I gather? The docs are mute on this.
The docs recommend running ANALYZE on the table.
hrs=# ANALYZE VERBOSE hosts;
INFO: analy
Hello everyone,
Resolved, I've done:
hrs=# CLUSTER hosts_ip_idx ON hosts;
CLUSTER
hrs=#
hrs=#
hrs=# SELECT relpages * 8192 AS size_in_bytes, relname FROM pg_class
WHERE relnamespace = (SELECT oid FROM pg_namespace WHERE nspname =
'public') ORDER BY size_in_bytes DESC LIMIT 10;
size_in_bytes
Hello everyone,
I got this, first CLUSTER was hanging forever, I cancelled after half an
hour:
hrs=# CLUSTER hosts;
Cancel request sent
ERROR: canceling statement due to user request
Then I restarted postgres and get this now:
hrs=# CLUSTER hosts;
ERROR: there is no previously clustered
Hello everyone,
The app that created this db is written by me for a change. But I've
done simple VACUUM ANALYZE on the biggest table in db and got this:
before VACUUM ANALYZE:
hrs=# SELECT relpages * 8192 AS size_in_bytes, relname FROM pg_class
WHERE relnamespace = (SELECT oid FROM pg_names
Bill Moran wrote:
Note that the "correct" disk size for your database is probably closer
to the 1.6G you were seeing before.
This might be the case, but how do I find out what are the "correct" sizes?
I have a script that does following queries:
SELECT relpages * 8192 AS size_in_bytes, reln
Amitabh Kant wrote:
You need to do VACUUM FULL ANALYZE to claim the disk space, but this
creates a exclusive lock on the tables.
See http://www.postgresql.org/docs/8.3/static/sql-vacuum.html
Aha!
OK but why did the performance degrade so much? The same reason -- lack
of autovacuuming/vacuum
Hello,
The db in the application I maintain but didn't write (it obviously
makes use of PG, v 8.3), has been systematically growing in size from
about 600M to 1.6G.
At the same time, the performance of the app has degraded significantly
(several times).
So I've done VACUUM ANALYZE on entire db.
Hello everyone,
I need to retrieve PK (r.id in the query) for row with
MIN(r.start_date), but with a twist: I need to select only one record,
the one with minimum date.
Doing it like this does not solve the problem:
SELECT h.id AS host_id, MIN(r.start_date) AS reservation_start_date,
r.id A
Thanks a lot, Sam (and others), thanks to your help I managed to finally
produce the query I wanted.
Regards,
mk
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Sam Mason wrote:
On Thu, Apr 09, 2009 at 07:25:42PM +0200, Marcin Krol wrote:
Sam Mason wrote:
This is a big hint that things are going wrong. You need those quotes
in there, an "integer" is a plain number and not a date.
This one does work in the sense of selecting out the wrong h
e responsabilité
pour le contenu fourni.
> Date: Thu, 9 Apr 2009 18:08:04 +0200
> From: mrk...@gmail.com
> To: s...@samason.me.uk
> CC: pgsql-general@postgresql.org
> Subject: Re: [GENERAL] complicated query (newbie..)
>
> Sam Mason wrote:
> > On Thu, Apr 09, 2009 a
Sam Mason wrote:
This is a big hint that things are going wrong. You need those quotes
in there, an "integer" is a plain number and not a date.
This one does work in the sense of selecting out the wrong host but it
still produces nothing but NULLs!
SELECT h.id, r.id, r.start_date, r.end_da
Hello Sam,
Thanks a million for reply! I'm so frustrated with this..
Sam Mason wrote:
On Thu, Apr 09, 2009 at 06:08:04PM +0200, Marcin Krol wrote:
What I'm trying to accomplish is producing list of hosts available
within a specified timeframe.
What I have is a table of hosts
Hello everyone,
I've got this query:
SELECT hosts.id, MIN(reservation.start_date)
FROM hosts
LEFT OUTER JOIN reservation_hosts
ON reservation_hosts.host_id = hosts.id
LEFT OUTER JOIN reservation
ON (reservation_hosts.reservation_id = reservation.id AND
reservation.start_date > 2009-04-09)
GROU
Sam Mason wrote:
On Thu, Apr 09, 2009 at 04:47:32PM +0200, Marcin Krol wrote:
I've got 3 tables: hosts (with host.id column) and reservation (with
reservation.id column) in many-to-many relation, and reservation_hosts
which is an association table (with reservation_id and host_id co
Hello Aurimas,
Thanks for answer!
Do you need a MIN(start_date) for each host you get from the query
before last join?
Yes, I really do - the idea is that from several reservations fulfilling
the dates condition the earliest reservation has to be selected (i.e.
the one with minimum start da
Hello everyone,
I've got 3 tables: hosts (with host.id column) and reservation (with
reservation.id column) in many-to-many relation, and reservation_hosts
which is an association table (with reservation_id and host_id columns).
So I've got this query which selects hosts and reservations unde
Hello everyone,
I'm having this completely weird problem that ORDER BY doesn't seem to
work correctly in PG 8.1 as bundled in RedHat 5.
When I issue:
SELECT * FROM virtualization;
I get all the fields:
reservations=# SELECT * FROM virtualization;
id | Virtualization | color
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