rule of thumb or words of wisdom for btree cleaners?

All, Does anyone have a rule of thumb or words of wisdom regarding additonal btree cleaners? Looking at the output below it seems I could benefit from adding an additional cleaner Stats reset at 8:30 AM HPUX 11 $ onstat -C IBM Informix Dynamic Server Version 9.40.FC2W4 -- On-Line -- Up 3 days 14:50:17 -- 4460564 Kbytes Btree Cleaner Info BT scanner profile Information ============================== Active Threads 1 Global Commands 0 Number of partition scans 23 Main Block 0xc0000000e0a97cc8 BTC Admin 0x0000000000000000 BTS info id Prio Partnum Key Cmd 0xc0000000e0eb58b0 0 Low 0x055007F4 1 100000 Scan index Number of leaves pages scanned 10623920 Number of leaves with deleted items 122292 Time spent cleaning (sec) 22243 Number of index compresses 39214 Number of deleted items 4660843 Number of index range scans 0 Number of index leaf scans 259 Scan Type Leaf Darren Jacobs/Carmax