# of Free Checkpoints

Number of checkpoints performed by the housekeeper wash task. The housekeeper wash task performs checkpoints only when it has cleared all dirty pages from all configured caches.

If the housekeeper wash task finishes writing all dirty pages in all caches to disk, it checks the number of rows in the transaction log since the last checkpoint. If there are more than 100 log records, it issues a checkpoint. This is called a “free checkpoint” because it requires very little overhead. In addition, it reduces future overhead for normal checkpoints.

You can use the housekeeper free write percent parameter to configure the maximum percentage by which the housekeeper wash task can increase database writes. See Chapter 5, “Setting Configuration Parameters,” in the System Administration Guide, Volume 1.