To excuse my Englishman's level, sorry.

I would like know if there is some way to obtain of the engine of informix all of heavies queries?

Thank you in advance

Hi,

If you want to monitor running queries use the 'onstat -g ...' utility from the command line. Check out your 'Administrator's Reference' about the utility.
If you're working in a UNIX environment the script in this post Long running Query might be helpful to determine the heaviest running queries.

Regards