The “Housekeeper Tasks Activity” section reports on housekeeper tasks. If the configuration parameter housekeeper free write percent is set to 0, the housekeeper task HK WASH does not run. Enable space reclamation by setting enable housekeeper GC to a value between 1 and 5. Disable space reclamation by setting enable housekeeper GC to 0.
For more information, see:
Performance and Tuning: Basics, Chapter 3, “Using Engines and CPUs
“Diagnosing System Problems,” in System Administration Guide, Volume One
