Eviction (Architecture Guide)

	Data Structures	Source Location
	WT_EVICT_ENTRY WT_EVICT_QUEUE	src/include/cache.h src/evict/

Eviction represents the process or removing old data from the cache, writing it to disk if it is dirty. The general strategy uses a dedicated set of eviction threads that are tasked with identifying candidate data. If the data needs to be written, it is reconciled (converting the in-memory format to on-disk format), and then written. Clean memory can be freed if needed.

Eviction cannot be triggered directly by API calls, but happens as a result of enough data being dirtied.

Eviction is managed using WT_EVICT_QUEUE structures, each of which contains a list of WT_EVICT_ENTRY structures.