ERROR 1017: Can't find file: 'postdata_cashier.MYD' (errno: 2)

Every morning when I get into work, I try to do a query on one of my mysql table.  I get this message.

ERROR 1017: Can't find file: 'postdata_cashier.MYD' (errno: 2)

I wrote a script to query the table every hour and send me a count of the table, so I could find out what time the table went bad.  I get email up to 4:00 a.m.  Come to find out We back up our tables at 4:00 a.m.

I have taken the test script out of the cron and still the MYD and MYI files are missing from /var/lib/mysql/database/

The only file that remains is postdata_cashier.frm

Can someone explain and tell me how to fix this problem.  
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jmsloanAuthor Commented:
Our backup procedure is a simple tar command to all database files.  
have you tried running your backup script manually just to make sure it's not the culprit?
jmsloanAuthor Commented:
Working on that now.
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Sounds like your script is moving files out, not just copying. Before the TAR operation are you locking the tables? flushing them to disk?

You should do this:

2) Copy the table files to a temp dir
4) tar the temp dir

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Instead of flushing/locking the tables you can also just shut dow and restart mysql while your backing up your files.
Absolutely, just depends on if you want users able to read tables during the backup. If you can shut down it is always a good idea.
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