Why would it make such a difference to move mysqld to anothermachine?

[Matthew Seaman]

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Bob McConnell wrote:
| On Behalf Of Mel
| On Sunday 06 July 2008 10:58:54 Matthew Seaman wrote:
| 
|>> I suspect that you could have achieved a pretty good speed-up simply
| by
|>> adding another hard drive to your server and moving all of the
| database
|>> onto it, separate from the web root and any other areas which apache
|>> would be doing a lot of read/write operations on.
| 
| I have not been following this thread closely, and I don't know much
| about MySQL, but I do have a question here. Is it possible that the
| process of moving the database to the second machine also resulted in
| cleaning up (defragmenting?) the files and reordering some tables to
| more closely match their indexes? Would this reduce the response time on
| the new server, at least until a significant amount of additional data
| was added that reverses these effects?

Yes, that could be the case if the database was transferred by doing mysqldump
on the first machine and then loading the dump on the second.  It wouldn't be
the case if the data were transferred just by tarring up the DB data directory
and copying it over.

You can achieve the same effect by running 'OPTIMIZE TABLE foo;' from within
MySQL or using 'mysqlcheck --optimize ...'.  However, the scale of improvement
described is rather more than can generally be achieved by table optimization.

	Cheers,

	Matthew

- -- 
Dr Matthew J Seaman MA, D.Phil.                       Flat 3
~                                                      7 Priory Courtyard
PGP: http://www.infracaninophile.co.uk/pgpkey         Ramsgate
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