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Thanks all for your input. I see that the tuning page has quite a few new (to me) tuning tips and is a good place to start. Jens' tip on trying to gauge the mysql performance might be interesting too. A dpm-dbck is on the old to-do list, I don't see how it could do any harm. I presume there's not a --screwoverDB option? It could be that my sysadmin senses are tingling over nothing, and observation bias is making me see patterns in failures that just aren't there. Still I have a fortnight before I have a nice window of opportunity to do *something* - whatever that may be! Cheers, and Thanks again. Matt On 17/08/15 14:30, Ewan MacMahon wrote: >> -----Original Message----- >> From: GRIDPP2: Deployment and support of SRM and local storage management >> [mailto:[log in to unmask]] On Behalf Of Sam Skipsey >> >> also: our database is... quite a bit bigger than yours, and seems to be >> not too bad, so I'd leave dump/reloading until later in the debugging >> process. >> > Hmm. If he's having the downtime anyway, a dump/reload seems like a bit of a no-brainer; it might not help, but it's hard to see a downside. > > I think the interesting question should be whether to take the opportunity to run dpm-dbck over it, and based on my current experience with it I think I can give a solid recommendation for 'maybe'. > > Ewan >