I have a query that runs very slow and using Using temporary; Using
filesort. Is there a way to avoid them using current table structure?
Goal with the query is to find ads (ad_id) that have tags (tag_id) connected
to them, order by antal is used to get the most relevant first. ( the one
that
Hiya
I just inherited a project, and before I get started, Id like to do a
little clean up.
There a * load of unused and empty tables in the db. My question
is, does this in any way affect the performance of mysql in anyway and
if so how?
Kind Regards
Brent Clark
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One optimization I see quickly is changing the left join to an inner join.
You always look for records that exist in tag_ad_map (by checking for
tm.is_active) so the left join is not necessary. That should at least speed
this query up considerably.
Walter
Need MySQL advice?
OlinData.com is the
Empty files, like empty tables is not synonym for useless or unused.
Of course it depends from the storage engine used but
in the list of performance tuning removing empty tables is way way down,
they have almost no impact while not used.
The bottom line, remove only when sure 100% of their
Claudio Nanni wrote:
Empty files, like empty tables is not synonym for useless or unused.
Of course it depends from the storage engine used but
in the list of performance tuning removing empty tables is way way down,
they have almost no impact while not used.
The bottom line, remove only when
Hello mysql,
Greetings in the New Year to everyone. Hope for only good things...
I have been using a WAMP for maybe 5 years, started with Apache2Triad
and eventually evolved to WAMPSERVER which is what I am running now.
Over the years, I have upgraded my server many times and the procedure
that
hi all,
We have a c application who work perfecty with mysql 5.0. We decide to
upgrade and use mysql 5.1.
Since that, nothing work, in owr log, we have always the follonig
error Using unsupported buffer type: 254 (parameter: 2) when we
call the mysql_stmt_bind_result function
what we do is a
You can only copy files liek that for MyISAM tables. Are you sure you didn't
accidentally convert to INNODB somewhere along the line? If so, go back to
your old install and dump everything so you can import it in the new
install, or convert everything back to MyISAM in the old install before
Could it be associated with one of the known issues listed at
http://dev.mysql.com/doc/refman/5.1/en/upgrading-from-5-0.html ?
quote:
Incompatible change: In MySQL 5.1.25, a change was made to the way
that the server handles prepared statements. This affects prepared
statements processed at the
heu... sorry but something I don't understand,
what I did is remove the mysql dierctory (programFile\mysql) remove
the data directory,( C:\Documents and Settings\All Users\Application
Data)
remove all key who are in regedit and contain mysql (more or less).
remove the services, restart my
Not really, the query took 4-5 seconds. The query runs through 13910 rows
according to explain, that isnt alot is it?
SELECT COUNT(*) antal,ad.ad_id FROM ad
INNER JOIN tag_ad_map tm ON tm.ad_id=ad.ad_id
WHERE
tm.tag_id IN (99, 10807, 20728, 21, 135)
AND ad.is_removed = 0 AND ad.is_active=1
I m really sorry,I read and re Read but I understang nothing , maybe it's
cause I m noob with mysql or maybe cause the subject is not explicit.
when I say 5.0 to 5.1 it's just the code not the database. like I explain I
TOTALY remove mysql 5.0 AND THE DATA , all data files, all registery,
Hi,
Probably a simple question for someone who knows :)
Is there a way to force MySQLD to restart after it has finished processing
all current transactions?
I seem to remember from the bit of Oracle work I did in the past we could
do a Transactional Restart in Oracle 10g which caused the server
I don't know if this can be useful,
just a few things I found out.
INNODB engine does not start if you have already files into the directory
and you change the file size in the my.cnf either of the innodb Datafile or
innodb Logfile,
remove innodb files before starting mysql.
Moreover MyISAM is the
Hi,
I'm not asking this as a specific question, more a general gripe
looking for some kind of explanation.
I don't do mysql restores very often, but many times when I have tried
I get nasty errors as if its bombing out due to dodgy characters, or
quote problems etc.
Normally I am doing
Hi
I tested with both release and debug versions and the problem is the same,
it fails when calling
mysql_real_connect()
shared memory request function
strcpy() asm code access violation to 0x
Regards,
Miguel
On Sun, Jan 11, 2009 at 9:57 AM, Patrick Sherrill
Read the mysqld man pages about what it does with kill -X signals.
One of them may mean graceful stop
Or not.
If there is one, you'd still have to figure out how to tie that into a re-boot
or whatever for updates.
Sounds like a perfectly reasonable feature request if you find nothing
Did you re-compile/re-link your C app with the new MySQL header files?...
Sounds like you didn't.
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-Original Message-
From: Claudio Nanni [mailto:claudio.na...@gmail.com]
Sent: Wednesday, January 14, 2009 4:50 AM
To: Brent Clark
Cc: mysql@lists.mysql.com
Subject: Re: Unused and empty tables - what impact on mysql
Empty files, like empty tables is not synonym for useless or unused.
Of
Andy,
I just had an interesting experience you might also find interesting. I
rarely have to do restores, also (MySQL is very solid), but I just upgraded
my (only) MySQL server. At the same time I upgraded the MySQL release from
5.0.45 to 5.0.67. While testing my procedure (which was a piece of
Hi
I'm using /MT (LIBCMT.lib?) and it is multi-threaded since all my
multi-thread code is working. LIBCMTD.lib is ignored because it is indicated
in a post at MySQL forums
http://forums.mysql.com/read.php?45,49606,49606#msg-49606; and anyway
applications do not compile if not ignored because
Hi,
On Wed, Jan 14, 2009 at 3:00 PM, John Daisley
john.dais...@mypostoffice.co.uk wrote:
Hi,
Probably a simple question for someone who knows :)
Is there a way to force MySQLD to restart after it has finished processing
all current transactions?
I seem to remember from the bit of Oracle
The index hint is not in productoin code.. I was trying ot force it to use
the index even when using the OR clause.. ment to take that out before I
sent the email.
The table structure is:
CREATE TABLE `customer` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`ssn` varchar(32) DEFAULT NULL,
Hi all,
One website is based on LAMP(Linux+Apache+MySQL+PHP)(that is our case).We
donot have very big tables or complicated database design.We only have one
database.
Because the php code is a third-party product we donot want to make much
modification on the code.
But when it comes to the
oki, I found, it's the dll in system32 who was not suppress.
thanks for all
a++
On Wed, Jan 14, 2009 at 4:27 PM, c...@l-i-e.com wrote:
Did you re-compile/re-link your C app with the new MySQL header files?...
Sounds like you didn't.
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