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Knowing when and how plans are reused or recompiled can help you design high-performing applications. The more you understand about optimal query plans, and how different actual values and cardinalities require different plans, the more you can determine when recompilation is a useful thing. When you are getting unnecessary recompiles, or when SQL Server is not recompiling when you think it should, your troubleshooting efforts will be easier the more you know about how plans are managed internally. In this section, we explore the internal organization of the plan cache, the metadata available, how SQL Server nds a plan in cache, plan cache sizing, and the plan eviction policy.

The plan cache in SQL Server is made up of four separate memory areas, called cache stores. There are actually other stores in its memory, which can be seen in the DMV called sys.dm_os_memory_cache_counters, but only four that contain query plans. The names in parentheses below are the values that can be seen in the type column of sys.dm_os_memory_cache_counters:

XML is rapidly becoming an integral part of standard IT infrastructure Most of us agree that no IT executive or IT-focused business executive can afford to ignore this fact Even so, too few of them take the time to understand XML s business value; instead, they perceive XML as another technology solution to a technology problem Nothing could be less true: As Solomon Simon intones in these pages, Business on the Internet is not about a technology model; business on the Internet, as with business anywhere, is about a business model And few technologies give rise to more interesting e-business models than XML Taking a historical view can be instructive Manuel Castells, a scholar at the University of California at Berkeley, has argued that the new information economy is largely a product of two historic trends: (1) the recently emergent post-Fordism model of supply chain execution one that rests on the principles of flexible and just-in-time manufacturing, a la Dell Computer and (2) the development of IT networks The intersection of these trends is giving rise, according to Castells, to a new organizational form called the network enterprise, whose sole purpose is to process information more efficiently than the competition In 2001, evidence of these trends abounds Many companies are building (or have already built) messaging transport pathways among their previously monolithic enterprise applications to enable a unified view of corporate information The most enterprising ones are also building new pathxiii

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Object Plans (CACHESTORE_OBJCP) Object Plans include plans for stored procedures, functions, and triggers. SQL Plans (CACHESTORE_SQLCP) SQL Plans include the plans for adhoc cached plans, autoparameterized plans, and prepared plans. The memory clerk that manages the SQLCP cache store is also used for the SQL Manager, which manages all the T-SQL text used in your adhoc queries.

Bound Trees (CACHESTORE_PHDR) Bound Trees are the structures produced by the algebrizer in SQL Server for views, constraints, and defaults. Extended Stored Procedures (CACHESTORE_XPROC) Extended Procs (Xprocs) are prede ned system procedures, like sp_executesql and sp_tracecreate, that are de ned using a dynamic link library (DLL), not using T-SQL statements. The cached structure contains only the function name and the DLL name in which the procedure is implemented.

Each plan cache store contains a hash table to keep track of all the plans in that particular store. Each bucket in the hash table contains zero, one, or more cached plans. When determining which bucket to use, SQL Server uses a very straightforward hash algorithm. The hash key is computed as (object_id * database_id) mod (hash table size). For plans that are associated with adhoc or prepared plans, the object_id is an internal hash of the batch text. The DMV sys.dm_os_memory_cache_hash_tables contains information about each hash table, including its size. You can query this view to retrieve the number of buckets for each of the plan cache stores using the following query:

SELECT type as 'plan cache store', buckets_count FROM sys.dm_os_memory_cache_hash_tables WHERE type IN ('CACHESTORE_OBJCP', 'CACHESTORE_SQLCP', 'CACHESTORE_PHDR', 'CACHESTORE_XPROC');

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