PHP fatal error:Pdo.php and Mysql.php

[Mon May 06 08:05:47 2013] [error] PHP Fatal error: Maximum execution

time of 30 seconds exceeded in D:\wwwroot\piwik\libs\Zend\Db\Statement\Pdo.php on line

228。
[Fri May 10 08:55:36 2013] [error] [client 192.168.132.100] PHP Fatal error: Maximum execution

time of 30 seconds exceeded in D:\wwwroot\piwik\core\Tracker\Db\Pdo\Mysql.php on line

172, referer: http://www.XXX.XX.cn/.
I don’t know what does the variable means ,and how to set the maximum execution.
Thank you very much!!
God bless you!!
Jocelyn

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Sometime it ocurred the error, but I do not know why.