myisamchk: warning: 1 clients is using or hasn"t closed the table properly

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I can't find out where to get any info on this problem.
Can you help?
I am using perl on RedHat 7.2.
I keep getting these messages even though my code uses $sth->finish;
Where do these come from or how do I properly close a table when done?
I've looked at all the reasons =
at:http://www.mysql.com/doc/M/y/MyISAM_table_close.html
and none of these apply to me.
This is an http site where all access is perl cgi.
What can I do to investigate or eliminate this problem?

Thanks,
Keith
myisamchk: warning: 1 clients is using or hasn't closed the table =
properly


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