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- Query Plan Cache Methods
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.
注解
For details on specific methods, including syntax and examples, click on the specific method to go to its reference page.
| 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(). |