Moving data between tables

We are currently using Informix 7.1 on Solaris and are having the following problem. Our application populates a table with data during the day and then, once the application has finished processing the data, needs to move the records into another table for storage (30 days of history). The problem is that during the day, between 2-4 million records are inserted into our daily table and moving those records to the history table takes a excessive ammount of time (i.e., over 24 hours). My question is, what is the best way of moving data from one table to another in the fastest possible manner? I've heard about detaching and attaching fragments from one table to another, but our problem seems to be that the processing can fall behind the population, so using a set number of fragments may not be possible. Can I attach a table to another? Is there another solution? Thanks -drew sautins@coralsys.com