Informix database filling up rapidly

Hi Gurus, I am facing a strange problem with informix database growth patterns. We are using Version 9.21.UC7XO for our application database. Normally application tables grow at rate of 1% per day. But recently we hit with 80% growth in database within a week time. Comparing the application data tables size dump taken at start and end of this period showed normal growth only. Suspecting some temporary tables eating up db space and causing rapid growth. Find some tables in our application database created with name like: _temptable 3116_2401 3130_2414 These are occupying considerable space in dbspace. Please help me in understanding what these tables are and how they will be created and their impact. Thanks, Kamesh

Run onstat -u and onstat -g ses for each session. There must be an application creating temp tables or doing queries that take a long time and are not using indexes.