Problems with MySQL since upgrade

[Richard Morse]

Hi!  All of these queries worked just fine, without causing any  
problems.

As this is more of a mysql issue, do you have any suggestions where  
it would be best for me to query them?

Thanks,
Ricky

On Aug 2, 2006, at 9:36 AM, Jim Stapleton wrote:

> 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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