> > -----Original Message-----
> > From: Robinson, Eric [mailto:eric.robinson@stripped]
> > Sent: Thursday, May 09, 2013 1:58 PM
> > To: mysql@stripped
> > Subject: Slow Response -- What Does This Sound Like to You?
> > We have a situation where users complain that the system
> > freezes for 30-90 seconds. We check the slow query logs and
> find that
> > one user issued a complex query that did indeed take 30-90
> seconds to
> > complete. However, NO slow queries are recorded for the other 50
> > users, before, during, or after the freeze. Note that the complex
> > query in question always shows: "Lock_time: 0".
> > Q: What conditions could cause single query to lock up a
> database for
> > a while for all users (even though it shows "lock time: 0") but no
> > other slow queries would show in the logs for any other
> users who are
> > hitting the database at the same time?
> > OS: RHEL3 x64
> > CPU: 8 x 2.9GHz Xeon
> > RAM: 32GB
> > Disk: RAID 5 (6 x 512GB SSD)
> > MySQL: 5.0.95 x64
> > Engine: MyISAM
> MyISAM? Or InnoDB?
> Lock_time perhaps applies only to table locks on MyISAM.
> SHOW ENGINE InnoDB STATUS;
> You may find some deadlocks.
> Is Replication involved?
> Anyone doing an ALTER?
MyISAM, no replication involved, and nobody is altering the database. This happens
whenever people run certain reports.
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