On Mon, Dec 30, 2002 at 01:21:49PM -0700, Matt Sturtz wrote:
> Hello, Jeremy, et al-- Thanks for the reply before... Further questions:
>
>
> >> Is it possible to set either set the priority ('nice') of the Slave
> >> thread down so it doesn't do that?
> >
> > The slave thread only? No, not really. You could nice MySQL when you
> > start it up. But I'm not sure how much effect (positive or negative)
> > that'd have.
>
> When I run "show [full] processlist", there's an "Id" column, but it
> doesn't corrospond with the Unix PID of the process (on OS's that
> use a seperate PID for each thread-- like Linux does)...
Right.
> Is there any way to(easilly) figure out which PID is handling the
> slave thread, so that I might re-nice it after it's already been
> started up?
Not that I know of. From MySQL's point of view there's no way to
know.
> >> Or, alternatly, is there a way to limit the slave thread to only "X"
> >> bin-log transactions per second?
> >
> > There is not.
>
> Any plan to add this feature? I would think it'd be useful...
I've not heard of any. You can always lobby to get it on the MySQL
TODO list.
> > Are your updates already well optimized? If you're doing enough work to
> > cause noticeable speed problems, I'd double-check that if you
> > haven't already.
>
> MyTOP says our key efficiency is 97.35%, with an average of 1.24
> q/sec (on the master-- most queries are done directly on the slave,
> with only updates happening on the master). We've optimized things
> as best we can. The problem is our customers are allowed to
> bulk-load keywords into our database, which causes about 4 large
> tables to be updated quite a bit. Whenever this happens, the slaves
> struggle to get caught back up...
Ahh, okay. I buy that.
Jeremy
--
Jeremy D. Zawodny | Perl, Web, MySQL, Linux Magazine, Yahoo!
<[EMAIL PROTECTED]> | http://jeremy.zawodny.com/
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