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SQL Server, Plan Cache Object

The Plan Cacheobject provides counters to monitor how SQL Server uses memory to store objects such as stored procedures, ad hoc and prepared Transact-SQL statements, and triggers. Multiple instances of the Plan Cache object can be monitored at the same time, with each instance representing a different type of plan to monitor.

This table describes are the SQLServer:Plan Cachecounters.

SQL Server Plan Cache counters

Description

Cache Hit Ratio

Ratio between cache hits and lookups.

Cache Object Counts

Number of cache objects in the cache.

Cache Pages

Number of 8-kilobyte (KB) pages used by cache objects.

Cache Objects in use

Number of cache objects in use.

Each counter in the object contains the following instances:

Plan Cache instance

Description

_Total

Information for all types of cache instances.

Sql Plans

Query plans produced from an ad hoc Transact-SQL query, including auto-parameterized queries, or from Transact-SQL statements prepared using sp_prepare or sp_cursorprepare. SQL Server caches the plans for ad hoc Transact-SQL statements for later reuse if the identical Transact-SQL statement is later executed. User-parameterized queries (even if not explicitly prepared) are also monitored as Prepared SQL Plans.

Object Plans

Query plans generated by creating a stored procedure, function, or trigger.

Bound Trees

Normalized trees for views, rules, computed columns, and check constraints.

Extended Stored Procedures

Catalog information for extended stores procedures.

Temporary Tables & Table Variables

Cache information related to temporary tables and table variables.

For more information about caching query plans, see Execution Plan Caching and Reuse.