Alvaro Herrera [EMAIL PROTECTED] writes
Interesting; do they use an overwriting storage manager like Oracle, or
a non-overwriting one like Postgres?
They call this MVCC RLV(row level versioning). I think they use rollback
segment like Oracle (a.k.a version store or tempdb in SQL Server).
On Aug 17, 2005, at 10:11 PM, Jeremiah Jahn wrote:
I just put together a system with 6GB of ram on a 14 disk raid 10
array.
When I run my usual big painful queries, I get very little to know
memory usage. My production box (raid 5 4GB ram) hovers at 3.9GB used
most of the time. the new devel
Qingqing Zhou wrote:
Alvaro Herrera [EMAIL PROTECTED] writes
Interesting; do they use an overwriting storage manager like Oracle, or
a non-overwriting one like Postgres?
They call this MVCC RLV(row level versioning). I think they use rollback
segment like Oracle (a.k.a version store or
Hello:
We are having serious performance problems using
JBOSS and PGSQL.
Im sure the problem has to do with the
application itself (and neither with JBOSS nor PGSQL) but the fact is that we are using desktop equipment
to run both Jboss and Postgresql (An Athlon 2600, 1
Gb Ram, IDE HDD
here's an example standard query. Ireally have to make the first hit go
faster. The table is clustered as well on full_name as well. 'Smith%'
took 87 seconds on the first hit. I wonder if I set up may array wrong.
I remeber see something about DMA access versus something else, and
choose DMA
Jeremiah Jahn wrote:
here's an example standard query. Ireally have to make the first hit go
faster. The table is clustered as well on full_name as well. 'Smith%'
took 87 seconds on the first hit. I wonder if I set up may array wrong.
I remeber see something about DMA access versus something
Christopher
You could use a 1 column/1 row table perhaps. Use some sort of
locking
mechanism.
Also, check out contrib/userlock
userlock is definitely the way to go for this type of problem.
The are really the only way to provide locking facilities that live
outside transactions.
You are
On 18 Aug 2005, at 16:01, Sebastian Lallana wrote:
It exists something like this? Does anybody has experience about
this subject?
I've just been through this with a client with both a badly tuned Pg and
an application being less than optimal.
First, find a benchmark. Just something you
John Arbash Meinel wrote :
You might also try a different query, something like:
SELECT DISTINCT cod FROM mytable ORDER BY cod GROUP BY cod;
(You may or may not want order by, or group by, try the different
combinations.)
It might be possible to have the planner realize that all you
Mahesh Shinde wrote:
Hi
I am using Postgres version
**PostgreSQL 7.4.5 on i686-pc-linux-gnu, compiled by GCC gcc
(GCC) 3.2.2 20030222 (Red Hat Linux 3.2.2-5).* *
for an multy user desktop application using VB 6.0 as a front
end toll.
To connect To the PostgreSQL I am
Barry,
I have made a similar experience, moving a big Oracle data base to
Postgres 8.03 on linux.
The first impact was similar, huge performance problems.
The main problem was bad planner choices. The cause in our case: bad
parameter types in the jdbc set methods (I guess you use Java). For
De : Magnus Hagander [mailto:[EMAIL PROTECTED]
Out of curiosity, what plan do you get from SQLServer? I bet
it's a clustered index scan...
//Magnus
I have a Table scan and Hashaggregate...
Stephane
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TIP 1:
Ulrich Wisser wrote:
one of our services is click counting for on line advertising. We do
this by importing Apache log files every five minutes. This results in a
lot of insert and delete statements.
...
If you are doing mostly inserting, make sure you are in a transaction,
Well, yes,
One little thing. Did you shutdown sql2000 while testing
postgresql? Remember that postgresql uses system cache.
Sql2000 uses a large part of memory as buffer and it will not
be available to operating system. I must say that, probably,
results will be the same, but it will be a better
Summary
===
We are writing to the db pretty much 24 hours a day.
Recently the amount of data we write has increased, and the query speed,
formerly okay, has taken a dive.
The query is using the indexes as expected, so I don't _think_ I have a query
tuning issue, just an io problem.
The
7.4 is the pg version BTWgoing to switch to 8 if it's worth it.
Ingrate, n.: A man who bites the hand that feeds him, and then complains
of indigestion.
--
Don't say yes until I finish talking.
-- Darryl F. Zanuck
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The system is a dual Xenon with 6Gig of ram and 14 73Gig 15K u320 scsi
drives. Plus 2 raid 1 system dives.
RedHat EL ES4 is the OS.
Any1 have any suggestions as to the configuration? The database is about
60 Gig's. Should jump to 120 here quite soon. Mus of the searches
involve people's names.
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