Sorry, forgot to specify the engine. The table runs on InnoDB backend. Also, changed the subject to be more specific.
On Sat, Sep 6, 2014 at 2:26 PM, Ajay Garg <ajaygargn...@gmail.com> wrote: > Hi all. > > > We are facing a very strange scenario. > > We have two mysql-instances running on the same machine, and they had > been running functionally fine since about 6 years or so (catering to > millions of records per day). > > However, since last few days, we were experiencing some elongated > slowness on both the instances. > So, we decided to "OPTIMIZE TABLE slow_table" on both the instances. > > We first ran the command on one instance. > That speeded up things massively (select count(*) that was earlier > taking 45 minutes was now running in less than 3 minutes). > > > We then ran the command on the second instance. However, that seemed > to have no effect. > We ran the command again (on the same instance); again it had no effect. > > > > What could be the reason of this strange behavior? > Both the instances run under fairly the same load, and both instances > are mounted on the same partition (obviously, all the directories are > different). > > > Hoping for some light on this strange issue. > > > > Thanks and Regards, > Ajay -- Regards, Ajay -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql
