Query Plan Cache Methods¶

The PlanCache methods are only accessible from a collection’s plan cache object. To retrieve the plan cache object, use the db.collection.getPlanCache() method.

Name	Description
`db.collection.getPlanCache()`	Returns an interface to access the query plan cache object and associated PlanCache methods for a collection.”
`PlanCache.help()`	Displays the methods available for a collection’s query plan cache. Accessible through the plan cache object of a specific collection, i.e. `db.collection.getPlanCache().help()`.
`PlanCache.listQueryShapes()`	Displays the query shapes for which cached query plans exist. Accessible through the plan cache object of a specific collection, i.e. `db.collection.getPlanCache().listQueryShapes()`.
`PlanCache.getPlansByQuery()`	Displays the cached query plans for the specified query shape. Accessible through the plan cache object of a specific collection, i.e. `db.collection.getPlanCache().getPlansByQuery()`.
`PlanCache.clearPlansByQuery()`	Clears the cached query plans for the specified query shape. Accessible through the plan cache object of a specific collection, i.e. `db.collection.getPlanCache().clearPlansByQuery()`
`PlanCache.clear()`	Clears all the cached query plans for a collection. Accessible through the plan cache object of a specific collection, i.e. `db.collection.getPlanCache().clear()`.

← db.upgradeCheckAllDBs() db.collection.getPlanCache() →