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You will get back the value Version 2 . Had you worked with the snapshot isolation level, you would have gotten back Version 1 .

TABLE 4-8

isolation level, you can do so by specifying the READCOMMITTEDLOCK table hint . Using this hint, a reader will be blocked when requesting a shared lock on a resource that is under modification (exclusively locked) . This hint allows readers to work at a similar level to read committed while at read committed snapshot level .

That's basically it. You use UDAs just like you use any other built-in aggregate function. To test the new functions, run the following code, and you'll get the same results returned by the other solutions to custom aggregates I presented earlier.

SELECT orderid, custid, empid, shipperid, orderdate, filler FROM dbo.Orders WHERE orderdate >= '#' AND orderdate < '#';

At this point, close all connections . Restore the testdb database to its default settings:

SELECT orderid, custid, empid, shipperid, orderdate, filler FROM dbo.Orders WHERE orderdate >= '20080101' AND orderdate < '20080201';

Now you can focus your tuning efforts on the query patterns that you got back in our case, only one. Of course, in a similar manner you can identify the query patterns that generate the largest result sets, most of the I/O, and so on.

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SELECT groupid, dbo.CSStrAgg(string) AS string FROM tempdb.dbo.Groups GROUP BY groupid; SELECT groupid, dbo.VBStrAgg(string) AS string FROM tempdb.dbo.Groups GROUP BY groupid; SELECT groupid, dbo.CSProdAgg(val) AS product FROM tempdb.dbo.Groups GROUP BY groupid; SELECT groupid, dbo.VBProdAgg(val) AS product FROM tempdb.dbo.Groups GROUP BY groupid;

ALTER DATABASE testdb SET ALLOW_SNAPSHOT_ISOLATION OFF; ALTER DATABASE testdb SET READ_COMMITTED_SNAPSHOT OFF;

SQL Server 2008 provides a DMV called sys.dm_exec_query_stats that aggregates query performance information for queries whose plans are in cache. Unlike the trace approach, this DMV won t report any information for queries whose plans are not in cache (for example, when procedures or queries use the RECOMPILE option). However, for queries whose plans are in cache, you get very interesting performance information that is aggregated since the query plan was cached. Needless to say, if the plan is removed from cache, this information is gone. Note, though, that if you enable the system collection set Query Statistics, it collects information from this DMV on regular intervals based on the collection frequency de ned for it and stores the information in the management data warehouse. You can also analyze this information graphically with the precon gured report Query Statistics History. (In Object Explorer, right-click Data Collection under Management and choose Reports.) Of course, if you want, you can also create your own jobs to collect information from this DMV with your own queries.

For your convenience, Table 5-2 provides a summary of all isolation levels, the problems that each allows or prevents, the supported concurrency model, and whether the isolation detects update conflicts for you .

The information that this view provides for each cached query plan includes, among other things, the following:

When you're done experimenting with the UDAs, run the following code to disable CLR support: EXEC sp_configure 'clr enabled', 0; RECONFIGURE WITH OVERRIDE;

TABLe 5-2

A SQL handle that you can provide as input to the function sys.dm_exec_sql_text to get the text of the parent query or batch of the current query. You also get the start and end offsets of the query that the current row represents so that you can extract it from the full parent query or batch text. Note that the offsets are zero based and are speci ed in bytes, although the text is Unicode (meaning two bytes of storage per character). A plan handle that you can provide as input to the function sys.dm_exec_query_plan to get the XML form of the plan. Creation time and last execution time. Execution count. Performance information including worker (CPU) time, physical reads, logical reads, CLR time, and elapsed time. For each performance counter, you get the total for all invocations of the plan, last, minimum and maximum. A binary query hash and a binary plan hash. The former allows you to identify queries with the same query signature, similar to the checksum value I suggested creating earlier for traced data. The latter allows you to identify similar query execution plans. Note that the query hash and plan hash values (query_hash and query_plan_hash attributes) were introduced in SQL Server 2008, while all other attributes were also available in SQL Server 2005.

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