Free space in chunks

Hi, I'm using IDS 2000 9.21 UC5 on Sun Solaris. We have 5 chunks in each instance. I am trying to ensure that the database does not run out of room and I am deleting historical data from the tables. However, the output of onstat -d does not seem to reflect this. The free space in the data chunks does not seem to grow. Here is the output Chunks address chk/dbs offset size free bpages flags pathname cf0b918 1 1 0 64000 36484 PO- /opt/ids2k/db_spaces/root_chk1 cf4a9b0 2 2 0 32768 1995 PO- /opt/ids2k/db_spaces/logs_chk1 cf4ab20 3 3 0 512000 511947 PO- /opt/ids2k/db_spaces/temp_chk1 cf4ac90 4 4 0 768000 587270 PO- /opt/ids2k/db_spaces/indx_chk1 cf4ae00 5 5 0 1023000 4 PO- /opt/ids2k/db_spaces/ data_chk1 cf0ba88 6 5 0 512000 257259 PO- /opt/ids2k/db_spaces/ data_chk2 6 active, 2047 maximum What else do I need to do to ensure that the deletion is effective and the tables have room to grow? I absolutely do not want to add another chunk but I want to delete old data and free space in the existing chunks. Thanks in advance, Jack