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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.

Remember that you can have a mixed case with some key ranges that are new and with some rows destined for existing pages. For rows with key ranges that are new, you get minimal logging when TF-610 is on regardless of whether the TABLOCK hint is used. For rows inserted into existing pages, you always get full logging.

This generates the following output:

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This section summarizes the requirements for minimal logging. The SELECT INTO statement has one requirement to be processed with minimal logging the database recovery model should be set to a non-FULL recovery model (SIMPLE or BULK_LOGGED). Note that if you re populating a temporary table, what matters is tempdb s recovery model, which is SIMPLE and can t be changed. You can summarize the requirements for minimal logging for the other insert methods (BULK INSERT, bcp.exe, INSERT SELECT FROM OPENROWSET(BULK . . .), and regular INSERT SELECT) with the following logical expression:

This query is equivalent to the following query using STDistance(), presented earlier:

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 dboOrders WHERE orderid >= 2147483647; GO SET SHOWPLAN_XML OFF;.

non-FULL recovery model AND not replicated AND ( (Heap AND TABLOCK) OR (B-tree AND empty AND TABLOCK) OR (B-tree AND empty AND TF-610) OR (B-tree AND nonempty AND TF-610 AND new key-range) )

DECLARE @polygon GEOMETRY; SET @polygon = (SELECT GEOM FROM Polygons WHERE NAME = 'Area1'); SELECT NAME FROM Points WHERE @polygon.STDistance(GEOM) <= .4;

SQL Server 2008 introduces support for minimal logging with the regular INSERT SELECT statement. The INSERT SELECT method is sometimes preferable to SELECT INTO because it does not involve locks on metadata, and it gives you control over the schema of the target table that you create. SQL Server 2008 also introduces support for minimal logging when inserting data into a nonempty B-tree (clustered or nonclustered index). Minimal logging is used when inserting new key ranges that allocate and populate new pages while TF-610 is on regardless of whether the TABLOCK hint is speci ed. For those new key ranges, SQL Server internally takes key-range locks to ensure that other processes don t run con icting activities. I demonstrated only a sample of the possible insert scenarios just to give you a sense of how you can do your own research. Using the tools I provided here, you can gure out for yourself what kind of logging you get for the scenarios that are of interest to you. Unfortunately, the INSERT EXEC and MERGE statements currently do not support minimal logging.

Then run the query, providing the XML plan value in the USE PLAN hint like so:

The INSERT EXEC statement allows you to direct a table result set returned from a stored procedure or dynamic batch to an existing table:

This generates the following output:

INSERT INTO <target_table> EXEC {<proc_name> | (<dynamic_batch>)};

The query using STDistance is attractive because it uses fewer spatial methods and does not result in the creation of new spatial objects . Let s look at a more complicated example using both techniques . What if you wanted to find those points that were within .4 units of the Area1 boundary Let s look at two ways to solve this, one with STBuffer() and one with STDistance() . The first method creates a region .4 units wide, around the outside and the inside of the Area1 polygon boundary . This is done by constructing two new buffer objects, one .4 units larger and one .4 units smaller, and taking their difference with the STDifference() method . The new region is intersected against the Points table:

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