Second php script does not respond until the first have finished executing

I have 2 php files querying a single database. i have observed that when the first script is running and when you hit the url of the second script, the second page does not load until the first one finishes processing.

Sometimes the second script might even timeout with 'page not found' error i开发者_JAVA技巧f the first script takes too long.

What might be the reason for this? Doesnt mysql/php support mutiple scripts firing on a single table at once.

Am confused. Need some expert help.

Are you using sessions? The default file-based session handler locks the session file while the script is running, until such time as the script ends, or you do a session_write_close(). While the session file is locked, no other page that uses sessions can start up.