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MySQL server has gone away...

Posted on 2004-09-20
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Last Modified: 2006-11-17
I have written a Perl script that accesses a MySQL database repeatedly. After a few hundred selections & insertions into the database, subsequent selections are always answered with the following error message:

DBD::mysql::db selectrow_hashref failed: MySQL server has gone away at Metabase.pm line 67.

However,  Line 67 is just, and it worked perfect for the first few hundred database queries.
return $obj->{dbh}->selectrow_hashref($q2);

Any idea of what could be going on?  Thanks.
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Question by:bobwood2000
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2 Comments
 
LVL 19

Accepted Solution

by:
Kim Ryan earned 1200 total points
ID: 12109453
Perhaps your database connection is timing out. My initial suggestion would be to add more error reporting. Above your selectrow_hashref sstatement there is probably a prepare and execute statement. You could add something similar to the following:

my $rc = $sth->execute or die "Can't execute statement: $DBI::errstr";

and then
if $obj->{dbh}->selectrow_hashref($q2) {
   return $obj->{dbh}->selectrow_hashref($q2
}else
{
   die "Can't execute statement: $DBI::errstr";
}
 
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Author Comment

by:bobwood2000
ID: 12109663
Thanks for the help.

Rather than timing out, it seems I was trying to insert too much data into a single column. I was able to change the limit on the amount of data that may be inserted into a single column by adding "set-variable = max_allowed_packet=4M" (no quotes) to my.ini/my.cnf file in the [mysqld] block (and then restarting mysqld).

 
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