Hi,
I am struggling with the performance of a JBoss based J2EE application
with CMP 2.1. beans and using PostgreSQL as database back-end.
Because JBoss is largely responsible for the SQL queries that are send
to the back-end , I would like to see the queries that are actually
received by
Joost Kraaijeveld [EMAIL PROTECTED] schrieb:
Because JBoss is largely responsible for the SQL queries that are send
to the back-end , I would like to see the queries that are actually
received by PostgreSQL (insert, select, update and delete), together
with the number of times they are called,
Hello..
I presumed CPU intensive because:
1) I have no hdd lights turn on during a series of queries (about 50 of
them)
2) vmstat doesn't give me blocks in and just a couple of blocks out.
3) top reports between 95 and 100 user cpu.sometimes ,i can see
some hi and si work
The following left outer join plan puzzles me:
EXPLAIN ANALYZE SELECT * from t28 LEFT OUTER JOIN (t1 JOIN t11 ON
(t11.o = 'http://example.org' AND t11.s = t1.o)) ON t28.s = t1.s
WHERE t28.o = 'spec';
t28, t1, and t11 all have indexed columns named 's' and 'o' that contain 'text';
Nested Loop
How about trying:
Select *
From
(Select * from t28 where t28.0='spec') t28a
Left out join (t1 JOIN t11 ON
(t11.o = 'http://example.org' AND t11.s = t1.o)) ON t28a.s = t1.s
In this way, I think, the where clause on t28 would be performed before the
join rather than after.
Jonathan Blitz
First, I forgot to mention - this is 8.2 RC1 I was trying on
The suggested change produces an identical 'bad' query plan. The main
issue (I think) is that the query node that processes t1 JOIN t11 ON
..' is not aware of the join condition 't28.s = t1.s'.. even though
the value of t28.s (as
Hello..
I'm waiting for my new system , and meanwhile , i have some questions.
First , here are the specs:
The server will have kernel 2.1.19 and it will be use only as a postgresql
server (nothing else... no named,dhcp,web,mail , etc).
Postgresql version will be 8.2.
It will be heavily
Aaron Birkland [EMAIL PROTECTED] writes:
... Is is possible to generate a plan that looks like this:
Nested Loop Left Join (cost=???)
- Index Scan using t28_o on t28 (cost=0.00..9.11 rows=1 width=89)
Index Cond: (o = 'spec'::text)
- Nested Loop (cost=???)
-
Alexandru,
The server will have kernel 2.1.19 and it will be use only as a postgresql
Assuming you're talking Linux, I think you mean 2.6.19?
--
Josh Berkus
PostgreSQL @ Sun
San Francisco
---(end of broadcast)---
TIP 2: Don't 'kill -9' the
Hello..
Yes , sorry for the mistype..
Regards
Alex
- Original Message -
From: Josh Berkus josh@agliodbs.com
To: pgsql-performance@postgresql.org
Cc: Alexandru Coseru [EMAIL PROTECTED]
Sent: Sunday, December 03, 2006 10:11 PM
Subject: Re: [PERFORM] Hardware advice
Alexandru,
The
I am trying to optimize queries on one of the large table we have by
partitioning it. To test it I created a sample script. When I use Explain
Analyze on one of the queries the query planer shows sequence scan on all
the child partitions instead of only one child containing the required data.
I
Fayza Sultan [EMAIL PROTECTED] writes:
CREATE TABLE parent (
monthdate date NOT NULL,
id int4 NOT NULL,
CONSTRAINT parent_idx PRIMARY KEY (monthdate,id )
);
CREATE TABLE child1
(
CONSTRAINT child1_idx PRIMARY KEY (monthdate,id),
CONSTRAINT child1_chk CHECK (monthdate =
Your point solved my problem.
Thank you
-Fayza
On 12/4/06, Tom Lane [EMAIL PROTECTED] wrote:
Fayza Sultan [EMAIL PROTECTED] writes:
CREATE TABLE parent (
monthdate date NOT NULL,
id int4 NOT NULL,
CONSTRAINT parent_idx PRIMARY KEY (monthdate,id )
);
CREATE TABLE child1
(
I have always been frustrated by the wildly erratic performance of our
postgresql 8 server. We run aprogram that does heavy data importing via a
heuristics-based import program. Sometime records being imported would just
fly by, sometimes they would crawl. The import program imports records
Update on this issue, I solved my problem by doing the following:
1) Stopped the import, and did a checkpoint backup on my import target
schema
2) Dropped the import target schema
3) Restored a backup from a previous checkpoint when the tables were much
smaller
4) Performed a VACUUM/ANALYZE on
On Thu, 30 Nov 2006, Carlos H. Reimer wrote:
I would like to discover how much cache is present in
the controller, how can I find this value from Linux?
As far as I know there is no cache on an Adaptec 39320. The write-back
cache Linux was reporting on was the one in the drives, which is
People recommend LSI MegaRAID controllers on here regularly, but I have
found that they do not work that well. I have bonnie++ numbers that show
the controller is not performing anywhere near the disk's saturation level
in a simple RAID 1 on RedHat Linux EL4 on two seperate machines provided by
Hi List,
We've been doing some benchmarks lately (one of them made it to the
PostgreSQL frontpage) with postgresql 8.2 dev (cvs checkout of 3 june
2006). But we prefer of course to run a more production-like version and
installed postgresql 8.2rc1.
As it turns out after a dump/restore (to
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