Problems with MySQL since upgrade

[Jim Stapleton]

Not sure, seems more of a mysql question, but here's some guesses I
have for diagnostics.

could you run these queries?

SELECT COUNT(*) FROM users WHERE status < 3
SELECT COUNT(*) FROM sessiions WHERE sid = "d9fe25949f79f2c767a0d237b4fdf841"
SELECT COUNT(*) FROM FROM users u INNER JOIN sessions s ON u.uid =
s.uid WHERE s.sid = "d9fe25949f79f2c767a0d237b4fdf841" AND u.status <
3

-Jim Stapleton



On 8/2/06, Richard Morse <remorse at partners.org> wrote:
>
> On Aug 1, 2006, at 9:24 AM, Richard Morse wrote:
>
> > Hi!  I recently updated MySQL to version 5.0.22 using the ports
> > system (portupgrade -r -R mysql-\*).  Previous to this, MySQL was
> > behaving perfectly normally.  Since the upgrade, I have found that
> > every so often -- sometimes two or three times a day, sometimes
> > every other day, but no more often than that -- one of the
> > databases MySQL is hosting starts misbehaving, MySQL starts
> > climbing in processor usage, and I have to restart MySQL to
> > recover.  By "misbehaving", I mean that some subset of queries to
> > this database start not returning -- they take forever.  By
> > climbing in processor usage, I mean that my load averages, which
> > normally sit around 0, start going up to 3, 5, even 7.
> >
> > - How can I determine what query it is that is causing this to
> > happen?  I have turned on the log files by adding the following
> > line to /etc/rc.conf:
>
> Hi!  Since this time, I have, I think, found what query is causing
> the problem:
>
> SELECT u.*, s.* FROM users u INNER JOIN sessions s ON u.uid = s.uid
> WHERE s.sid = "d9fe25949f79f2c767a0d237b4fdf841" AND u.status < 3
> LIMIT 0, 1
>
> How can I determine _why_ this is causing MySQL to hang/enter some
> kind of infinite loop?
>
> Thanks,
> Ricky
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