mysql_pconnect make mysql too many connections

but increasing max_connections take more memory

[Xuefer]

mysql_pconnect -> too many connections -> increase mysql max_connections -> take up more memory -> slower?!

there's many static file: html/images
and dyn file: *.php
a php page is loaded, then images is requested, and then keep-alive idle, so most of mysql thread is idling...

what can i do to optimize?

[jaski]

If you need to close idle persistent connections, set a low wait_timeout in MySQL - [e-mail]

[Xuefer]

if you set wait_timeout, and you have high number of connection closed, you need too, set max_connect_errors (in MySQL) [mysql.com...]

does it mean every wait_timeout will count as connect_error?

and what avlue do u suggest to wait_timeout for web server?
php + many static file(images/js/css)
keep-alive timeout=15