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There are a few things to point out here. First, note the cacheobjtype column for the three queries. Instead of Compiled Plan, we have Compiled Plan Stub. Second, note the size_in_bytes value (336 bytes vs. ~ 57,000/82,000 bytes in figure 17.9). Third, the join to the sys.dm_exec_query_plan function reveals the absence of a stored query plan. What s happening here is that SQL Server detects these queries as ad hoc and not parameterized and therefore does not store a plan; however, it stores the stub in order to detect subsequent executions of the queries. For example, let s reexecute the first query from listing 17.4 and take another look at the procedure cache. The results are shown in figure 17.12. Note the difference in the size_in_bytes, cacheobjtype, usecounts, and query_plan columns for the first query that we reexecuted. By saving the stub from the first execution, SQL Server is able to detect subsequent executions as duplicates of the first. Thus, it upgrades the plan from a stub to a full plan on the second execution, with the third (and subsequent) executions able to reuse the saved plan. For environments containing large amounts of single-use ad hoc SQL, the Optimize for Ad Hoc Workloads option is a very significant new feature. Not only does it dramatically reduce the size of the procedure cache, but it still enables plan reuse in cases where identical ad hoc queries are executed many times, therefore also reducing CPU-related compilation pressure. In closing our section on procedure cache usage, let s look at a number of techniques for measuring the cache contents and plan reuse.

The T-SQL code in listing 17.5 summarizes the contents of the sys.dm_exec_ cached_plans DMV. It lists the number of plans for each object type (ad hoc, prepared, proc, and so forth) along with the number of megabytes consumed by such plans and the average plan reuse count.

-- Summary of Procedure Cache Contents SELECT objtype as [Object Type] , count(*) as [Plan Count]

, sum(cast(size_in_bytes as bigint))/1024/1024 as [Total Size (mb)] , avg(usecounts) as [Avg. Use Count] FROM sys.dm_exec_cached_plans GROUP BY objtype

Procedure caches suffering from a high volume of ad hoc SQL typically have a disproportionate volume of ad hoc/prepared plans with a low average use count. Listing 17.6 determines the size in megabytes of such queries with a single-use count.

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-- Procedure Cache space consumed by AhHoc Plans SELECT SUM(CAST(size_in_bytes AS bigint))/1024/1024 AS [Size of single use adhoc sql plans] FROM sys.dm_exec_cached_plans WHERE objtype IN ('Prepared', 'Adhoc') AND usecounts = 1

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From a waits perspective, the RESOURCE_SEMAPHORE_QUERY_COMPILE wait type is a good indication of the presence of query compilation pressure. SQL Server 2005 introduced a throttling limit to the number of concurrent query compilations that can occur at any given moment. By doing so, it avoids situations where a sudden (and large) amount of memory is consumed for compilation purposes. A high incidence of this wait type may indicate that query plans are not being reused, a common problem with frequently executed unparameterized SQL. Another method for determining plan reuse is measuring the following Performance Monitor counters:

SQL Server SQL Statistics:SQL Compilations/Sec SQL Server SQL Statistics:SQL Re-Compilations/Sec SQL Server SQL Statistics:Batch Requests/Sec

With these counter values, we can measure plan reuse as follows:

Initial Compilations = SQL Compilations/Sec SQL Recompilation/Sec Plan Reuse = (Batch Req/sec - Initial Compilations) / Batch Req/sec

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In other words, of the batch requests coming in per second, how many of them are resulting in query compilations Ideally, in an OLTP system, this should be less than 10 percent, that is, a 90 percent or greater plan reuse. A value significantly less than this may indicate a high degree of compilations, and when observed in conjunction with significant RESOURCE_SEMAPHORE_QUERY_COMPILE waits, it s a reasonable sign that query parameterization may well be an issue, resulting in higher CPU and memory consumption. Poor plan reuse not only has a direct impact on available RAM, but it also affects CPU usage courtesy of higher amounts of compilations. In the next section, we ll address CPU pressure from a general perspective.

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