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db.collection.getPlanCache()

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Definition定义

db.collection.getPlanCache()
Important

mongosh Method

This page documents a mongosh method. This is not the documentation for a language-specific driver, such as Node.js.

For MongoDB API drivers, refer to the language-specific MongoDB driver documentation.

Returns an interface to access the query plan cache for a collection. The interface provides methods to view and clear the query plan cache.返回一个接口，用于访问集合的查询计划缓存。该接口提供了查看和清除查询计划缓存的方法。

Returns:返回值：Interface to access the query plan cache.用于访问查询计划缓存的接口。

The query optimizer only caches the plans for those query shapes that can have more than one viable plan.查询优化器只缓存那些可以有多个可行计划的查询形状的计划。

Methods方法

The following methods are available through the interface:通过界面可以使用以下方法：

Name名称Description描述
PlanCache.help()Displays the methods available for a collection's query plan cache. 显示可用于集合的查询计划缓存的方法。Accessible through the plan cache object of a specific collection, i.e. db.collection.getPlanCache().help().可通过特定集合的计划缓存对象访问，即db.collection.getPlanCache().help()。
PlanCache.clearPlansByQuery()Clears the cached query plans for the specified query shape. 清除指定查询形状的缓存查询计划。Accessible through the plan cache object of a specific collection, i.e. db.collection.getPlanCache().clearPlansByQuery()可通过特定集合的计划缓存对象访问，即db.collection.getPlanCache().clearPlansByQuery()
PlanCache.clear()Clears all the cached query plans for a collection. 清除集合的所有缓存查询计划。Accessible through the plan cache object of a specific collection, i.e. db.collection.getPlanCache().clear().可通过特定集合的计划缓存对象访问，即db.collection.getPlanCache().clear()。
PlanCache.list()Returns the plan cache information for a collection. 返回集合的计划缓存信息。Accessible through the plan cache object of a specific collection, i.e. db.collection.getPlanCache().list(). 可通过特定集合的计划缓存对象访问，即db.collection.getPlanCache().list()。
New in version 4.4. 4.4版新增。