please advice me about how to stop multiple db connection

[eluser]basementDUDE[/eluser]
I was told that my application use too many db connection by our hosting company.
My problem is I NEVER create a single db connection manually, its all managed by CI.How did it happen??

Any way I trouble shoot this problem?

Maybe set pconnect to false(Whether to use a persistent connection) in the db config file?

maybe I shoud put

Code:

$this->db->close();

in every single model method!??

thanks