PlanCache.clearPlansByQuery()

Definition

PlanCache.clearPlansByQuery( <query>, <projection>, <sort> )

Clears the cached query plans for the specified query shape.

Important

mongo Shell Method

This page documents a mongo method. This is not the documentation for database commands or language-specific drivers, such as Node.js. To use the database command, see the planCacheClear command.

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

The method is only available from the plan cache object of a specific collection; i.e.

db.collection.getPlanCache().clearPlansByQuery( <query>, <projection>, <sort> )

The PlanCache.clearPlansByQuery() method accepts the following parameters:

Parameter	Type	Description
query	document	The query predicate of the query shape. Only the structure of the predicate, including the field names, are significant to the shape; the values in the query predicate are insignificant.
projection	document	Optional. The projection associated with the query shape. Required if specifying the sort parameter.
sort	document	Optional. The sort associated with the query shape.

To see the query shapes for which cached query plans exist, see List Query Shapes.

Required Access

On systems running with authorization, a user must have access that includes the planCacheWrite action.

Example

If a collection orders has the following query shape:

{
  "query" : { "qty" : { "$gt" : 10 } },
  "sort" : { "ord_date" : 1 },
  "projection" : { },
  "queryHash" : "9AAD95BE" // Available starting in MongoDB 4.2
}

The following operation removes the query plan cached for the shape:

db.orders.getPlanCache().clearPlansByQuery(
   { "qty" : { "$gt" : 10 } },
   { },
   { "ord_date" : 1 }
)