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From:Andrew Braithwaite Date:July 23 2003 8:27pm
Subject:RE: mysql stops processing
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Hi,

I believe that MySQL v4 has a superuser privilege level that keeps a
connection available even when the regular connections are all used up just
for diagnosis/killing etc...  May want to try that to get your processlist
too.

Cheers,

Andrew

-----Original Message-----
From: Joe Shear [mailto:joe@stripped] 
Sent: Wednesday 23 July 2003 21:04
To: Heikki Tuuri
Cc: mysql@stripped
Subject: Re: mysql stops processing


Unfortunately, we haven't been able to connect to the database because of
the maxed out connections.  This happens so fast that the maxed out
connections is usually the first sign.  I've been hesitant to start the
monitor, since this has only been happening once every couple days. 
It's been becoming more frequent, so I'll try turning them on and see if we
get lucky.  Top isn't showing that our CPU usage is that high.  Last time we
saw this, it was around 50% on both procs.  Also, we are flushing logs every
5 minutes (this has caused problems in the past).

On Wed, 2003-07-23 at 12:56, Heikki Tuuri wrote:
> Joe,
> 
> ----- Original Message -----
> From: "Joe Shear" <joe@stripped>
> Newsgroups: mailing.database.mysql
> Sent: Wednesday, July 23, 2003 10:40 PM
> Subject: RE: mysql stops processing
> 
> 
> > hi,
> >
> > We're pretty careful about preventing that.  Also, no queries are 
> > moving forward, no inserts, updates, or selects, even the ones on 
> > tables that are only a mixture of inserts and selects.
> 
> what do SHOW PROCESSLIST and SHOW INNODB STATUS print in this 
> situation?
> 
> Or is it so that you cannot run them because of maxed out connections? 
> You could write script to run them every 5 seconds so that we could 
> see what is happening.
> 
> Also, if you do
> 
> CREATE TABLE innodb_monitor(a INT) TYPE=InnoDB;
> 
> then mysqld will print the output of SHOW INNODB STATUS to the .err 
> file every 15 seconds.
> 
> What is the CPU usage from 'top' during the hang?
> 
> 4.0.14 has better diagnostics than 3.23.56. An upgrade might help, but 
> let us wait a couple of days first.
> 
> > joe
> 
> Regards,
> 
> Heikki
> 
> 
> > On Wed, 2003-07-23 at 12:02, Andrew Braithwaite wrote:
> > > Hi,
> > >
> > > I don't know what type of applications are using your database but 
> > > if I
> had
> > > to guess at the problem, I would guess that you have a very slow 
> > > query
> which
> > > runs every now and again that is locking up certain tables/records
> causing
> > > all the other queries to queue up and eventually running out of
> connections
> > > on the DB.  To find out if this is the case, when your server gets 
> > > into
> this
> > > state run a "mysqladmin -v pro" and see if all the queries are 
> > > waiting
> for a
> > > lock to be freed up.
> > >
> > > Hope this helps,
> > >
> > > Andrew
> > >
> > > -----Original Message-----
> > > From: Joe Shear [mailto:joe@stripped]
> > > Sent: Wednesday 23 July 2003 19:45
> > > To: mysql@stripped
> > > Subject: mysql stops processing
> > >
> > >
> > > Hi,
> > >
> > > Has anyone ever had any problems with MySQL w/ all InnoDB tables 
> > > just
> stop
> > > processing queries?  There doesn't seem to be any pattern to it, 
> > > it
> happens
> > > at times of relatively high load (load avg of 4 on a dual proc) 
> > > but the
> CPUs
> > > still have plenty of idle time, and the disks aren't maxing out.  
> > > It
> doesn't
> > > happen everytime there is a high load either.  The box just stops
> processing
> > > every query, and we quickly hit the max connection limit.  The 
> > > only
> solution
> > > we've found is to shutdown mysql and restart it -- at which point 
> > > it
> works
> > > fine for a couple days.  We are running mysql 3.23.56 w/ redhat 
> > > 7.3 and 2.4.20 kernel.  Anybody have any suggestions?
> > >
> > > thanks,
> > > joe
> > --
> > Joe Shear <joe@stripped>
> >
> >
> > --
> > MySQL General Mailing List
> > For list archives: http://lists.mysql.com/mysql
> > To unsubscribe:
> http://lists.mysql.com/mysql?unsub=1
> >
-- 
Joe Shear <joe@stripped>


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Thread
mysql stops processingJoe Shear23 Jul
RE: mysql stops processingAndrew Braithwaite23 Jul
  • RE: mysql stops processingJoe Shear23 Jul
  • HELP WITH mySQL!!!Michael C. Podlesny23 Jul
    • Re: HELP WITH mySQL!!!Nils Valentin24 Jul
Re: mysql stops processingHeikki Tuuri23 Jul
  • Re: mysql stops processingJoe Shear23 Jul
Re: mysql stops processingHeikki Tuuri23 Jul
  • Re: mysql stops processingJoe Shear23 Jul
RE: mysql stops processingAndrew Braithwaite23 Jul
Re: mysql stops processingHeikki Tuuri23 Jul
Re: mysql stops processingHeikki Tuuri24 Jul
  • Re: mysql stops processingJoe Shear24 Jul
Re: mysql stops processingHeikki Tuuri24 Jul
Re: mysql stops processingInfo26 Jul
Re: mysql stops processingInfo26 Jul