Hello everyone,
I'm having a hard time with the following query. It
retrieves about 3K rows from a few tables. One of them
contains over 40M rows. When run on a 3Ghz server with
1G of RAM it returns the rows in more than 1 mini. I
don't think that's normal.
Here's the output of EXPLAIN:
mysql
On 15 Jul 2004 at 6:27, Patrick Drouin [EMAIL PROTECTED]
wrote:
I'm having a hard time with the following query. It
retrieves about 3K rows from a few tables. One of them
contains over 40M rows. When run on a 3Ghz server with
1G of RAM it returns the rows in more than 1 mini. I
don't think
Bonjour Arnaud,
--- Arnaud [EMAIL PROTECTED] wrote:
On 15 Jul 2004 at 6:27, Patrick Drouin
Your indexes look good, but I see that you have some
varchar fields.
Maybe
you could run an optimize table on these tables?
I'm running it at the moment, I will follow-up on the
list when it's done.
What version of MySQL are you using? Have you checked the cardinality on
these tables?
-Original Message-
From: Patrick Drouin
To: [EMAIL PROTECTED]
Sent: 7/15/04 8:27 AM
Subject: Need help optimizing query
Hello everyone,
I'm having a hard time with the following query. It
retrieves
Hello Victor,
What version of MySQL are you using? Have you
checked the cardinality on
these tables?
Problem solved! Optimizing the table brought the query
time down to 17 secs Wow!
Thanks for the input Victor and merci to Arnaud for
the quick fix.
Patrick
Are your tables indexed? http://www.mysql.com/doc/en/MySQL_indexes.html
Saqib Ali
-
http://www.xml-dev.com
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Absolutely! I have multiple indexes. I think it might be a problem with ODBC
Are your tables indexed? http://www.mysql.com/doc/en/MySQL_indexes.html
Saqib Ali
-
http://www.xml-dev.com
-
Visit CARMEL MUSIC ENTERTAINMENT website
Two Questions:
Is the same query running directly on the linux server thru mysql is also very slow ?
Have you done a explain plan on the query ?
Marc.
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list?
Which parts of the process are slow? How does the query perform from the
mysql command line?
-Original Message-
From: Apollo (Carmel Entertainment) [mailto:[EMAIL PROTECTED]
Sent: 19 August 2003 17:29
To: [EMAIL PROTECTED]
Subject: Need help optimizing query, awfully slow
: Wednesday, August 20, 2003 2:52 PM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: RE: Need help optimizing query, awfully slow on only
2 records
When following query is pulled up, it takes about whole 1-2
minutes to come up. inquiries table has 17000 records,
contacts
Query takes 3.4 seconds to run on the server, but it takes 1-2minutes to run via
MyODBC 3.51.06 using passthrough (Access97 is the front end, but it has query
type that allows bypass of Access interpretation.
Two Questions:
Is the same query running directly on the linux server thru mysql is
To: Michael S. Fischer
Cc: [EMAIL PROTECTED]
Subject: RE: Need help optimizing query, awfully slow on only
2 records
Result of EXPLAIN is:
table|type|possible_keys|key|key_len|ref|rows|Extra
inquiries|ALL|contact_id| | | |8253|Using filesort
individual_contacts|eq_ref
]
Sent: Wednesday, August 20, 2003 3:14 PM
To: Michael S. Fischer
Cc: [EMAIL PROTECTED]
Subject: RE: Need help optimizing query, awfully slow on only
2 records
Result of EXPLAIN is:
table|type|possible_keys|key|key_len|ref|rows|Extra
inquiries|ALL|contact_id| | | |8253
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: RE: Need help optimizing query, awfully slow on only
2 records
When following query is pulled up, it takes about whole 1-2
minutes to come up. inquiries table has 17000 records,
contacts has about 7000, individual_contacts has about
1.2Ghz Pentium, with 1/2Gig of ram, 4.0.14MySQL, RedHat9.0
I have about 20K records that result from the following query. Front end for the
database is ACCESS97 and pulling up 20K records makes a huge performance hit.
For the form in question I am using PASSTHROUGH type query (the one that just
Greetings, I am struggling trying to get good performance
using indexes.
I'll spare the details and narrow down the situation. I have about
100,000 rows of data with the following fields:
title - vachar(64)
description - text
state - varchar(2)
priority - int
modified - date
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