On Dec 11, 2006, at 04:35 , Tatsuo Ishii wrote:
That's not the whole story. UTF-8 and other variable-width encodings
don't provide a 1:1 mapping of logical characters to single bytes; in
particular, combination characters opens the possibility of multiple
different byte sequences mapping to the
On 12/11/06, Ravindran G - TLS, Chennai. [EMAIL PROTECTED] wrote:
Hello,
How to get Postgresql Threshold value ?. Any commands available ?.
What is meant my threshold value ?
---(end of broadcast)---
TIP 1: if posting/reading through Usenet,
Hi,
try using:
tmp=# show all;
and
tmp=# show geqo_threshold;
Regards,
Kaloyan Iliev
Ravindran G - TLS, Chennai. wrote:
Hello,
How to get Postgresql Threshold value ?. Any commands available ?.
Regards, Ravi
DISCLAIMER
The contents of this e-mail and any attachment(s) are
On mán, 2006-12-11 at 17:01 +1100, Chris wrote:
Mark Kirkwood wrote:
Chris wrote:
It's the same as doing a select count(*) type query using the same
clauses, but all in one query instead of two.
It doesn't return any extra rows on top of the limit query so it's
better than using
On 12/11/06, Alexander Staubo [EMAIL PROTECTED] wrote:
On Dec 11, 2006, at 02:47 , Daniel van Ham Colchete wrote:
I never understood what's the matter between the ASCII/ISO-8859-1/UTF8
charsets to a database. They're all simple C strings that doesn't have
the zero-byte in the midlle (like
Hi Dave,
On 12/11/06, Dave Cramer [EMAIL PROTECTED] wrote:
Hi Daniel
On 10-Dec-06, at 8:02 PM, Daniel van Ham Colchete wrote:
Hi Gene,
at my postgresql.conf, the only non-comented lines are:
fsync = off
This can, and will result in lost data.
I know... If there is a power failure things
On 11-Dec-06, at 5:36 AM, Daniel van Ham Colchete wrote:
Hi Dave,
On 12/11/06, Dave Cramer [EMAIL PROTECTED] wrote:
Hi Daniel
On 10-Dec-06, at 8:02 PM, Daniel van Ham Colchete wrote:
Hi Gene,
at my postgresql.conf, the only non-comented lines are:
fsync = off
This can, and will result
Mike,
unfortunally I don't have any benchmarks right now. Doing something
like this with the same machine would be a 2-day work (at least).
Installing a Gentoo and putting it to run well is not a quick task
(although is easy).
But, trust me on this one. It's worth it. Think of this: PostgreSQL
How much memory does this machine have and what version of postgresql
are you using?
It's only a test server with 512MB RAM, I only used it to see how well
would the PostgreSQL do in a ugly case.
Given that optimal performance for postgresql can require up to 50%
of available memory, you
On Mon, Dec 11, 2006 at 09:05:56AM -0200, Daniel van Ham Colchete wrote:
But, trust me on this one. It's worth it.
You know what? I don't.
Think of this: PostgreSQL and GNU LibC use a lot of complex algorithms:
btree, hashes, checksums, strings functions, etc... And you have a lot of
ways to
On Mon, Dec 11, 2006 at 09:05:56AM -0200, Daniel van Ham Colchete wrote:
unfortunally I don't have any benchmarks right now.
That's fairly normal for gentoo users pushing their compile options.
Mike Stone
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TIP 4: Have
On 12/11/06, Steinar H. Gunderson [EMAIL PROTECTED] wrote:
On Mon, Dec 11, 2006 at 09:05:56AM -0200, Daniel van Ham Colchete wrote:
But, trust me on this one. It's worth it.
You know what? I don't.
So test it yourself.
Think of this: PostgreSQL and GNU LibC use a lot of complex algorithms:
This is very very very true :-)!
I just remebered one case with MySQL. When I changed the distro from
Conectiva 10 (rpm-based ended brazilian distro) to Gentoo, a MySQL
operation that usually took 2 minutes to run, ended in 47 seconds.
This is absolutely vage. I don't have how to prove it to
Oops! [EMAIL PROTECTED] (Daniel van Ham Colchete) was seen spray-painting on
a wall:
But, trust me on this one. It's worth it.
No, the point of performance analysis is that you *can't* trust the
people that say trust me on this one.
If you haven't got a benchmark where you can demonstrate a
You are right Christopher.
Okay. Let's solve this matter.
What PostgreSQL benchmark software should I use???
I'll test PostgreSQL 8.1 on a Fedora Core 6 and on a Gentoo. I'll get
the same version FC6 uses and install it at my Gentoo. I'll use the
same hardware (diferent partitions to each).
On Mon, Dec 11, 2006 at 11:09:13AM -0200, Daniel van Ham Colchete wrote:
You know what? I don't.
So test it yourself.
You're making the claims, you're supposed to be proving them...
As I said, it is an example. Take floatpoint divisions. You have
plenty of ways of doing it: 387, MMX, SSE,
On 12/11/06, Steinar H. Gunderson [EMAIL PROTECTED] wrote:
On Mon, Dec 11, 2006 at 11:09:13AM -0200, Daniel van Ham Colchete wrote:
You know what? I don't.
So test it yourself.
You're making the claims, you're supposed to be proving them...
As I said, it is an example. Take floatpoint
On Mon, Dec 11, 2006 at 11:17:06AM -0200, Daniel van Ham Colchete wrote:
I just remebered one case with MySQL. When I changed the distro from
Conectiva 10 (rpm-based ended brazilian distro) to Gentoo, a MySQL
operation that usually took 2 minutes to run, ended in 47 seconds.
How do you know
On Mon, Dec 11, 2006 at 11:31:48AM -0200, Daniel van Ham Colchete wrote:
What PostgreSQL benchmark software should I use???
Look up the list archives; search for TPC.
I'll test PostgreSQL 8.1 on a Fedora Core 6 and on a Gentoo. I'll get
the same version FC6 uses and install it at my Gentoo.
Thank you very much for your reply.
This is not working in Postgresql 8.1.4. Its throwing some error.
BTW, how to fetch the total disk space that is alloted to DB in postgresql
?. Any commands available ?.
Regards, Ravi
-Original Message-
From: Kaloyan Iliev [mailto:[EMAIL
am Mon, dem 11.12.2006, um 19:41:29 +0530 mailte Ravindran G - TLS, Chennai.
folgendes:
Thank you very much for your reply.
This is not working in Postgresql 8.1.4. Its throwing some error.
Which errors?
test=# show geqo_threshold;
geqo_threshold
12
(1 row)
test=*#
Thanks.
I am using Postgres 8.1.4 in windows 2000 and i don't get the proper
response for threshold.
-
pg_database_size(name) - is giving the current space used by DB. But I want
like Total space utilized by DB and Free space.
Regards, Ravi
-Original Message-
From: [EMAIL
On 12/11/06, Daniel van Ham Colchete [EMAIL PROTECTED] wrote:
But, trust me on this one. It's worth it. Think of this: PostgreSQL
and GNU LibC use a lot of complex algorithms: btree, hashes,
checksums, strings functions, etc... And you have a lot of ways to
compile it into binary code. Now you
On 12/9/06, Tom Lane [EMAIL PROTECTED] wrote:
Axel Waggershauser [EMAIL PROTECTED] writes:
... This works quite well for the
following setups:
client - server
-
linux - linux
linux - windows
windows - windows
but pretty bad (meaning about 10 times slower) for this
I'm out of ideas here, maybe someone could try to reproduce this
behavior or could point me to the thread containing relevant
information (sorry, maybe I'm just too dumb :-/)
please specify how you're transfering the data from windows - linux. are
you using odbc? if yes, what driver? are you
On 12/11/06, Thomas H. [EMAIL PROTECTED] wrote:
I'm out of ideas here, maybe someone could try to reproduce this
behavior or could point me to the thread containing relevant
information (sorry, maybe I'm just too dumb :-/)
please specify how you're transfering the data from windows - linux.
On 12/11/06, Ravindran G - TLS, Chennai. [EMAIL PROTECTED] wrote:
Thanks.
I am using Postgres 8.1.4 in windows 2000 and i don't get the proper
response for threshold.
what is the response you get ? please be specific about the issues.
also the footer that comes with your emails are
not
Axel Waggershauser [EMAIL PROTECTED] writes:
On 12/9/06, Tom Lane [EMAIL PROTECTED] wrote:
This has to be a network-level problem. IIRC, there are some threads in
our archives discussing possibly-related performance issues seen with
Windows' TCP stack.
I searched the archives but found
[EMAIL PROTECTED] (Daniel van Ham Colchete) writes:
You are right Christopher.
Okay. Let's solve this matter.
What PostgreSQL benchmark software should I use???
pgbench is one option.
There's a TPC-W at pgFoundry
(http://pgfoundry.org/projects/tpc-w-php/).
There's the Open Source
Rajesh Kumar Mallah [EMAIL PROTECTED] writes:
On 12/11/06, Ravindran G - TLS, Chennai. [EMAIL PROTECTED] wrote:
I am using Postgres 8.1.4 in windows 2000 and i don't get the proper
response for threshold.
what is the response you get ? please be specific about the issues.
Even more to the
On Mon, Dec 11, 2006 at 8:58 AM, in message
[EMAIL PROTECTED], Axel
Waggershauser [EMAIL PROTECTED] wrote:
I'm out of ideas here, maybe someone could try to reproduce this
behavior or could point me to the thread containing relevant
information
No guarantees that this is the problem, but
Hi all,
I'd like to get suggestions from all you out there for
a new Postgresql server that will replace an existing one.
My performance analysis shows very *low* iowaits,
and very high loads at times of peak system activity.
The average concurrent processes number is 3/4, with peaks of 10/15.
Hello!
In our JAVA application we do multiple inserts to a table by data from a
Hash Map. Due to poor database access implemention - done by another
company (we got the job to enhance the software) - we cannot use prepared
statements. (We are not allowed to change code at database access!)
Jens Schipkowski [EMAIL PROTECTED] schrieb:
Hello!
In our JAVA application we do multiple inserts to a table by data from a
Hash Map. Due to poor database access implemention - done by another
company (we got the job to enhance the software) - we cannot use prepared
statements. (We
So, my questions:
Is it possible to use COPY FROM STDIN with JDBC?
Should be. Its at least possible using DBI and DBD::Pg (perl)
my $copy_sth = $dbh - prepare( COPY
general.datamining_mailing_lists (query_id,email_key) FROM STDIN;) ;
$copy_sth - execute();
while (my ($email_key ) =
Jens Schipkowski [EMAIL PROTECTED] writes:
Is it possible to use COPY FROM STDIN with JDBC?
You should be asking the pgsql-jdbc list, not here. (I know I've seen
mention of a JDBC patch to support COPY, but I dunno if it's made it into
any official version.)
Will it bring performance
Jens Schipkowski jens.schipkowski 'at' apus.co.at writes:
Hello!
In our JAVA application we do multiple inserts to a table by data from
a Hash Map. Due to poor database access implemention - done by
another company (we got the job to enhance the software) - we cannot
use prepared
This definitely is the correct approach.
Actually, Daniel van Ham Colchete may not be as all wet as some
around here think. We've had previous data that shows that pg can
become CPU bound (see previous posts by Josh Berkus and others
regarding CPU overhead in what should be IO bound tasks).
On Mon, Dec 11, 2006 at 12:15:51PM -0500, Ron wrote:
I'd say the fairest attitude is to do everything we can to support
having the proper experiments done w/o presuming the results.
Who's presuming results?[1] It is fair to say that making extraordinary
claims without any evidence should be
On Wed, Dec 06, 2006 at 08:55:14 -0800,
Mark Lewis [EMAIL PROTECTED] wrote:
Anyone run their RAIDs with disk caches enabled, or is this akin to
having fsync off?
Disk write caches are basically always akin to having fsync off. The
only time a write-cache is (more or less) safe to enable
Statements like these can not be reasonably interpreted in any manner
_except_ that of presuming the results:
I expect that you'll discover, if you actually do these tests, that
this belief (that using arch specific compiler options lead to
better performing SW) is fairly much nonsense.
Michael,
On 12/11/06 9:31 AM, Michael Stone [EMAIL PROTECTED] wrote:
[1] I will say that I have never seen a realistic benchmark of general
code where the compiler flags made a statistically significant
difference in the runtime.
Here's one - I wrote a general purpose Computational Fluid
The Sun X4600 is very good for this, the V40z is actually EOL so I'd stay
away from it.
You can currently do 8 dual core CPUs with the X4600 and 128GB of RAM and
soon you should be able to do 8 quad core CPUs and 256GB of RAM.
- Luke
On 12/11/06 8:26 AM, Cosimo Streppone [EMAIL PROTECTED]
On Mon, Dec 11, 2006 at 01:20:50PM -0500, Ron wrote:
(The validity of the claim has nothing to do with the skills or
experience of the claimant or anyone else in the discussion. Only on
the evidence.)
Please go back and reread the original post. I don't think the response
was unwarranted.
On Mon, Dec 11, 2006 at 10:30:55AM -0800, Luke Lonergan wrote:
Here's one - I wrote a general purpose Computational Fluid Dynamics analysis
method used by hundreds of people to perform aircraft and propulsion systems
analysis.
That's kinda the opposite of what I meant by general code. I was
On 12/11/06, Andreas Kretschmer [EMAIL PROTECTED] wrote:
Jens Schipkowski [EMAIL PROTECTED] schrieb:
Hello!
In our JAVA application we do multiple inserts to a table by data from a
Hash Map. Due to poor database access implemention - done by another
company (we got the job to enhance the
On 12/11/06, Ron [EMAIL PROTECTED] wrote:
Statements like these can not be reasonably interpreted in any manner
_except_ that of presuming the results:
I expect that you'll discover, if you actually do these tests, that
this belief (that using arch specific compiler options lead to
better
At 01:47 PM 12/11/2006, Michael Stone wrote:
On Mon, Dec 11, 2006 at 01:20:50PM -0500, Ron wrote:
(The validity of the claim has nothing to do with the skills or
experience of the claimant or anyone else in the discussion. Only
on the evidence.)
Please go back and reread the original post.
On 12/11/06, Steinar H. Gunderson [EMAIL PROTECTED] wrote:
On Mon, Dec 11, 2006 at 11:17:06AM -0200, Daniel van Ham Colchete wrote:
I just remebered one case with MySQL. When I changed the distro from
Conectiva 10 (rpm-based ended brazilian distro) to Gentoo, a MySQL
operation that usually
At 02:28 PM 12/11/2006, Merlin Moncure wrote:
also, some people posting here, not necessarily me, are authority figures. :-)
merlin
Noam Chomsky was one of the most influential thinkers in Linguistics
to yet have lived. He was proven wrong a number of times. Even
within Linguistics.
Michael,
On 12/11/06 10:57 AM, Michael Stone [EMAIL PROTECTED] wrote:
That's kinda the opposite of what I meant by general code. I was trying
(perhaps poorly) to distinguish between scientific codes and other
stuff (especially I/O or human interface code).
Yes - choice of language has often
On 12/11/06, Steinar H. Gunderson [EMAIL PROTECTED] wrote:
On Mon, Dec 11, 2006 at 11:31:48AM -0200, Daniel van Ham Colchete wrote:
What PostgreSQL benchmark software should I use???
Look up the list archives; search for TPC.
I'll test PostgreSQL 8.1 on a Fedora Core 6 and on a Gentoo. I'll
On Mon, Dec 11, 2006 at 02:51:09PM -0500, Ron wrote:
Let's support getting definitive evidence.
Since nobody opposed the concept of contrary evidence, I don't suppose
you're fighting an uphill battle on that particular point.
It's fine to get preachy about supporting intellectual curiosity,
On 12/11/06, Chris Browne [EMAIL PROTECTED] wrote:
[EMAIL PROTECTED] (Daniel van Ham Colchete) writes:
You are right Christopher.
Okay. Let's solve this matter.
What PostgreSQL benchmark software should I use???
pgbench is one option.
There's a TPC-W at pgFoundry
On 12/11/06, Luke Lonergan [EMAIL PROTECTED] wrote:
The Sun X4600 is very good for this, the V40z is actually EOL so I'd stay
away from it.
also, it has no pci express slots. make sure to get pci-e slots :)
You can currently do 8 dual core CPUs with the X4600 and 128GB of RAM and
soon you
Merlin,
On 12/11/06 12:19 PM, Merlin Moncure [EMAIL PROTECTED] wrote:
...and this 6 of them (wow!). the v40z was top of its class. Will K8L
run on this server?
No official word yet.
The X4600 slipped in there quietly under the X4500 (Thumper) announcement,
but it's a pretty awesome server.
Ron wrote:
We are not going to get valuable contributions nor help people become
more valuable to the community by flaming them into submission.
Let's support getting definitive evidence. No matter who brings it to
the table ;-)
Thanks, Ron, for a voice of respect and reason. Since I
Daniel van Ham Colchete wrote:
On 12/11/06, Steinar H. Gunderson [EMAIL PROTECTED] wrote:
On Mon, Dec 11, 2006 at 11:31:48AM -0200, Daniel van Ham Colchete wrote:
What PostgreSQL benchmark software should I use???
Look up the list archives; search for TPC.
I'll test PostgreSQL 8.1 on a
Hi yall,
I made some preliminary tests.
Before the results, I would like to make some acknowledgments:
1 - I didn't show any prove to any of the things I said until now.
2 - It really is a waste of everyone's time to say one thing when I
can't prove it.
But all I said, is the knowledge I have
Daniel,
Good stuff.
Can you try this with just -O3 versus -O2?
- Luke
On 12/11/06 2:22 PM, Daniel van Ham Colchete [EMAIL PROTECTED]
wrote:
Hi yall,
I made some preliminary tests.
Before the results, I would like to make some acknowledgments:
1 - I didn't show any prove to any of the
On 12/11/06, Tom Lane [EMAIL PROTECTED] wrote:
Yeah, that's what I couldn't think of the other day. The principal
report was here:
http://archives.postgresql.org/pgsql-general/2005-01/msg01231.php
By default, Windows XP installs the QoS Packet Scheduler service.
It is not installed by
Axel Waggershauser [EMAIL PROTECTED] writes:
I tested different sizes on linux some time ago and found that 64KB
was optimal. But playing with different sizes again revealed that my
windows-linux problem seems to be solved if I use _any_ other
(reasonable - meaning something between 4K and
On Mon, Dec 11, 2006 at 08:22:42PM -0200, Daniel van Ham Colchete wrote:
TEST 01: CFLAGS=-O2 -march=i686 fsync=false
tps = 734.948620 (including connections establishing)
tps = 736.866642 (excluding connections establishing)
[snip]
TEST 03: CFLAGS=-O2 -march=pentium4 fsync=false
tps =
After a long battle with technology, [EMAIL PROTECTED] (Michael Stone), an
earthling, wrote:
[1] I will say that I have never seen a realistic benchmark of
general code where the compiler flags made a statistically
significant difference in the runtime.
When we were initially trying out
On Mon, 11 Dec 2006, Michael Stone wrote:
Can anyone else reproduce these results? I'm on similar hardware (2.5GHz P4,
1.5G RAM)...
There are two likely candidates for why Daniel's P4 3.0GHz significantly
outperforms your 2.5GHz system.
1) Most 2.5GHZ P4 processors use a 533MHz front-side
Greg Smith [EMAIL PROTECTED] writes:
On Mon, 11 Dec 2006, Michael Stone wrote:
Can anyone else reproduce these results? I'm on similar hardware (2.5GHz P4,
1.5G RAM)...
There are two likely candidates for why Daniel's P4 3.0GHz significantly
outperforms your 2.5GHz system.
Um, you entirely
* Tom Lane:
If you don't like that theory, another line of reasoning has to do with
the fact that the maximum advertiseable window size in TCP is 65535 ---
there could be some edge-case behaviors in the Windows and Linux stacks
that don't play nicely together for 64K transfer sizes.
Linux
Thanks a lot to all for your tips.
Of course, I am doing all the INSERTs using a transaction. So the cost per
INSERT dropped from 30 ms to 3 ms.
The improvement factor matches with the hint by Brian Hurt.
Sorry, I forgot to mention we are using PostgreSQL 8.1.4.
Thanks for the code snippet
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