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If you want to develop your own code that would parse and analyze execution plan information, you will find the information returned by SHOWPLAN_TEXT, SHOWPLAN_ALL, and STATISTICS PROFILE very hard to work with. SQL Server 2005 introduces two new session options that allow you to get estimated and actual execution plan information in XML format; XML data is much more convenient for an application code to parse and work with. The SHOWPLAN_XML session option will produce an XML value with the estimated plan information, and the STATISTICS XML session option will produce a value with actual plan information To test SHOWPLAN_XML, turn it on by running the following code: SET SHOWPLAN_XML ON;
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Then run the following query: SELECT orderid, custid, empid, shipperid, orderdate, filler FROM dbo.Orders WHERE orderid = 280885;
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You will get the following XML value, shown here in abbreviated form: <ShowPlanXML xmlns="http://schemas.microsoft.com/sqlserver/2004/07/ showplan" Version="1.0" Build="9.00.1399.06"> <BatchSequence> <Batch> <Statements> <StmtSimple StatementText="SELECT orderid, custid, empid, shipperid, orderdate, fill er FROM dbo.Orders WHERE orderid = 280885;" StatementId="1" StatementCompI d="1" StatementType="SELECT" StatementSubTreeCost="0.00657038" StatementEstRows="1" Statemen tOptmLevel="TRIVIAL"> <StatementSetOptions QUOTED_IDENTIFIER="false" ARITHABORT="true" CONCAT_NULL_YIELD S_NULL="false" ANSI_NULLS="false" ANSI_PADDING="false" ANSI_WARNINGS="false" NUMERIC_ROUNDAB ORT="false" /> <QueryPlan CachedPlanSize="14"> <RelOp NodeId="0" PhysicalOp="Nested Loops" LogicalOp="Inner Join" EstimateRows= "1" EstimateIO="0" EstimateCPU="4.18e-006" AvgRowSize="195" EstimatedTotalSubtreeCost= "0.00657038" Parallel="0" EstimateRebinds="0" EstimateRewinds="0"> <OutputList> <ColumnReference Database="[Performance]" Schema="[dbo]" Table="[Orders]" Column="orderid" /> <ColumnReference Database="[Performance]" Schema="[dbo]" Table="[Orders]" Column="custid" /> <ColumnReference Database="[Performance]" Schema="[dbo]" Table="[Orders]" Column="empid" /> <ColumnReference Database="[Performance]" Schema="[dbo]" Table="[Orders]" Column="shipperid" />
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<ColumnReference Database="[Performance]" Schema="[dbo]" Table="[Orders]" Column="orderdate" /> <ColumnReference Database="[Performance]" Schema="[dbo]" Table="[Orders]" Column="filler" /> </OutputList> <NestedLoops Optimized="0"> <OuterReferences> <ColumnReference Column="Uniq1002" /> <ColumnReference Database="[Performance]" Schema="[dbo]" Table="[Orders]" Column="orderdate" /> </OuterReferences> <RelOp NodeId="1" PhysicalOp="Index Seek" LogicalOp="Index Seek" EstimateRow s="1" EstimateIO="0.003125" EstimateCPU="0.0001581" AvgRowSize="23" EstimatedTotalSubtreeCos t="0.0032831" Parallel="0" EstimateRebinds="0" EstimateRewinds="0"> ... </QueryPlan> </StmtSimple> </Statements> </Batch> </BatchSequence> </ShowPlanXML>
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Note that if you save the XML value to a file with the extension .sqlplan , you can then open it with SSMS and get a graphical view of the execution plan, as shown in Figure 3-16 .
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Figure 3-16. XML plan example
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Run the following code to turn the session option off: SET SHOWPLAN_XML OFF;
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As I mentioned earlier, to get an XML value with information about the actual execution plan, use the STATISTICS XML session option as follows: SET STATISTICS XML ON;
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GO SELECT orderid, custid, empid, shipperid, orderdate, filler FROM dbo.Orders WHERE orderid = 280885; GO SET STATISTICS XML OFF;
Hints
Hints allow you to override the default behavior of SQL Server in different respects, and SQL Server will comply with your request when technically possible. The term hint is a misnomer because it's not a kind gesture that SQL Server might or might not comply with; rather, you're forcing SQL Server to apply a certain behavior when it's technically possible. Syntactically, there are three types of hints: join hints, query hints, and table hints. Join hints are specified between the keyword representing the join type and the JOIN keyword (for example, INNER MERGE JOIN). Query hints are specified in an OPTION clause following the query itself; for example, SELECT ... OPTION (OPTIMIZE FOR (@od = '99991231')). Table hints are specified right after a table name or alias in a WITH clause (for example FROM dbo.Orders WITH (index = idx_unc_od_oid_i_cid_eid)). Hints can be classified in different categories based on their functionality, including: index hints, join hints, parallelism, locking, compilation, and others. Some performance-related hints, such as forcing the usage of a certain index, have both negative and positive aspects. On the negative side, a hint makes that particular aspect of the plan static. When data distribution in the queried tables changes, the optimizer would not consult statistics to determine whether it is worthwhile to use the index or not, because you forced it to always use it. You lose the benefit in cost-based optimization that SQL Server's optimizer gives you. On the positive side, by specifying hints you reduce the time it takes to optimize queries and, in some cases, you override inefficient choices that the optimizer occasionally makes as a result of the nature of cost-based optimization, which relies on statistics, or as a result of an optimizer bug. Make sure that you use performancerelated hints in production code only after exhausting all other means, including query revisions, ensuring that statistics are up to date, and ensuring that statistics have a sufficient sampling rate, and so on. You can find detailed information about the various supported hints in Books Online. I will use hints in several occasions in these books and explain them in context. To conclude this section, I'd like to introduce a nifty new hint in SQL Server 2005 that you might consider to be the ultimate hintUSE PLAN. This hint allows you to provide an XML value holding complete execution plan information to force the optimizer to use the plan that you provided. Remember that you can use the SHOWPLAN_XML session option to generate an XML plan. To see a demonstration of what happens when you use this hint, first run the following code to generate the XML plan: SET SHOWPLAN_XML ON; GO SELECT orderid, custid, empid, shipperid, orderdate FROM dbo.Orders WHERE orderid >= 2147483647; GO SET SHOWPLAN_XML OFF;
Then run the query, providing the XML plan value in the USE PLAN hint like so:
DECLARE @oid AS INT; SET @oid = 1000000; SELECT orderid, custid, empid, shipperid, orderdate FROM dbo.Orders WHERE orderid >= @oid OPTION (USE PLAN N'<ShowPlanXML xmlns="http://schemas.microsoft.com/sqlserver/2004/07/ showplan" Version="1.0" Build="9.00.1399.06"> <BatchSequence> <Batch> <Statements> <StmtSimple StatementText="SELECT orderid, custid, empid, shipperid, orderdate & #xA;FROM dbo.Orders WHERE orderid >= 2147483647; " StatementId="1" Stat ementCompId="1" StatementType="SELECT" StatementSubTreeCost="0.00657038" StatementEstRows="1 " StatementOptmLevel="FULL" StatementOptmEarlyAbortReason="GoodEnoughPlanFound"> <StatementSetOptions QUOTED_IDENTIFIER="false" ARITHABORT="true" CONCAT_NULL_YIELD S_NULL="false" ANSI_NULLS="false" ANSI_PADDING="false" ANSI_WARNINGS="false" NUMERIC_ROUNDAB ORT="false" /> <QueryPlan CachedPlanSize="14"> <RelOp NodeId="0" PhysicalOp="Nested Loops" LogicalOp="Inner Join" EstimateRows= "1" EstimateIO="0" EstimateCPU="4.18e-006" AvgRowSize="40" EstimatedTotalSubtreeCost= "0.00657038" Parallel="0" EstimateRebinds="0" EstimateRewinds="0"> ... <ParameterList> <ColumnReference Column="@1" ParameterCompiledValue="(2147483647)" /> </ParameterList> </QueryPlan> </StmtSimple> </Statements> </Batch> </BatchSequence> </ShowPlanXML>');
Note that the XML value in the preceding code is shown in abbreviated form. Of course, you should specify the full-blown XML value. SQL Server 2005 also supports a new plan guide feature, which allows you to attach an XML plan to a query when you cannot or do not want to change the query's text directly by adding hints. You use the stored procedure sp_create_plan_guide to produce a plan guide for a query. You can find more details about it in Books Online. SQL Server 2005 also introduces several other interesting hints, among them the RECOMPILE and OPTIMIZE FOR query hints. I'll discuss those in Inside T-SQL Programming as part of the discussion about stored procedure compilations and recompilations.
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