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Snapshot Level Database |
Logical Data Grouping dbase |
Monitor Switch Buffer Pool |
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Resettable |
Yes |
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Event Type Database |
Logical Data Grouping db_event |
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Element Name Element Type |
pool_drty_pg_thrsh_clns counter |
Description: The number of times a page cleaner was invoked because a buffer pool had reached the dirty page threshold criterion for the database.
Usage: The threshold is set by the chngpgs_thresh configuration parameter. It is a percentage applied to the buffer pool size. When the number of dirty pages in the pool exceeds this value, the cleaners are triggered.
If this value is set too low, pages might be written out too early, requiring them to be read back in. If set too high, then too many pages may accumulate, requiring users to write out pages synchronously. See the Administration Guide for more information.