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needs to make sure all 17 values match before determining that it has found a matching plan in cache. In addition to the 17 values found in sys.dm_exec_plan_attributes, the column sys.dm_exec_cached_plans.pool_id is also part of the cache key for any plan.
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There are two main types of plans in the Object and SQL plan cache stores: compiled plans and execution plans. Compiled plans are the type of object we have been looking at up to this point when examining the sys.dm_exec_cached_plans view. We have already discussed the three main objtype values that can correspond to a compiled plan: Adhoc, Prepared, and Proc. Compiled plans can be stored in either the Object Store or the SQL Store depending on which of those three objtype values they have. The compiled plans are considered valuable memory objects, since they can be costly to re-create. SQL Server attempts to keep them in cache. When SQL Server experiences heavy memory pressure, the policies used to remove cache objects ensure that our compiled plans are not the rst objects to be removed. A compiled plan is generated for an entire batch, not just for a single statement. For a multistatement batch, you can think of the compiled plan as an array of plans, with each element of the array containing a query plan for an individual statement. Compiled plans can be shared between multiple sessions or users. However, you should be aware that not every user executing the same plan will get the same results, even if there is no change to the underlying data. Unless the compiled plan is an adhoc plan, each user has his or her own parameters and local variables, and the batch may build temporary tables or worktables speci c to that user. The information speci c to one particular execution of a compiled plan is stored in another structure called the executable plan.
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Executable plans, or execution contexts, are considered to be dependent on compiled plans and do not show up in the sys.dm_exec_cached_plans view. Executable plans are run-time objects created when a compiled plan is executed. Just as for compiled plans, executable plans can be Object Plans, stored in the Object Store, or SQL Plans, stored in the SQL Store. Each executable plan exists in the same cache store as the compiled plan on which it depends. Executable plans contain the particular run-time information for one execution of a compiled plan, and include the actual run-time parameters, any local variable information, object IDs for objects created at run time, the user ID, and information about the currently executing statement in the batch. When SQL Server starts executing a compiled plan, it generates an executable plan from that compiled plan. Each individual statement in a compiled plan gets its own executable plan, which you can think of as a run-time query plan. Unlike compiled plans, executable plans are for a single session. For example, if 100 users are executing the same batch simultaneously, there will be 100 executable plans for the same compiled plan. Executable plans can be
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regenerated from their associated compiled plan, and they are relatively inexpensive to create. Later in this section, we look at the sys.dm_exec_cached_plan_dependent_objects view, which contains information about your executable plans. Note that Compiled Plan Stubs, generated when the Optimize for Ad Hoc Workloads con guration option is set to 1, do not have associated execution contexts.
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We have already looked at some of the information in the sys.dm_exec_cached_plans DMV when we looked at usecount information to determine whether or not our plans were being reused. In this section, we look at some of the other metadata objects and discuss the meaning of some of the data contained in the metadata.
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