firebird-support!

I have a FB 1.5.0 on Linux 9.0 working with a Radius . There are about 30-50 calls concurrently .
I have found that the SIZE of fbserver increased very quickly while the Radius running .What is the prossible reason?

+---------------------------------------------------------------------------+
PID USER PRI NI SIZE RSS share stat %CPU %MEM TIME CPU COMMAND
13512 root 15 0 1005M 151M 2516 S 5.1 41.8 0:11 0 fbserver
+---------------------------------------------------------------------------+


　　　　　　　　xuxu
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　　　　　　　　　　2005-01-24