mike,
Friday, October 11, 2002, 12:19:40 AM, you wrote:

m> ./bin/myisamchk: error: 'data/mckesson/tempbak.frm' doesn't have a
m> correct index definition. You need to recreate it before you can do a
m> repair

Don't use myisamchk with *.frm files!

m> on a number of my tables.  I have recently imported this data, from a
m> box that is totally ruined.  I have no other copy of the data.  

m> At first, I was getting 'Didn't find any fields in table' errors, that
m> after running mysqldump I was able to remove.  But I am getting this
m> index definition error.  How do I recreate the index definition?

m>  I am also getting very slow response on sites with this DB.

Check you queries, are they using indexes?

Check the following chapter about optimization in the MySQL manual:
      http://www.mysql.com/doc/en/MySQL_Optimisation.html



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