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INSERT INTO Points VALUES('Point1', geometry::Parse('POINT(3 4)')); INSERT INTO Points VALUES('Point2', geometry::STGeomFromText('POINT(5 3)',0)); INSERT INTO Points VALUES('Point3', geometry::STGeomFromText('POINT(5 2)',0)); INSERT INTO Points VALUES('Point4', geometry::STGeomFromText('POINT(2 4.7)',0)); INSERT INTO Points VALUES('Point5', geometry::STGeomFromText('POINT(4.1 2)',0)); INSERT INTO Lines VALUES('Line1', geometry::STGeomFromText('LINESTRING(2 2, 5 5)',0)); INSERT INTO Lines VALUES('Line2', geometry::STGeomFromText('LINESTRING(5 1, 6 1, 6 2, 7 2, 7 3)',0)); INSERT INTO Lines VALUES('Line3', geometry::STGeomFromText('LINESTRING(4 7, 5 1.5)',0)); INSERT INTO Polygons VALUES('Area1', geometry::STGeomFromText('POLYGON ((1 1, 4 1, 4 5, 1 5,1 1))',0)); INSERT INTO Polygons VALUES('Area2', geometry::STGeomFromText('POLYGON ((5 4, 5 7, 8 7, 8 4, 5 4))',0)); INSERT INTO Polygons VALUES('Area3', geometry::STGeomFromText('POLYGON ((2 3, 6 3, 6 6, 2 6, 2 3))',0));

10

When analyzing query performance, you sometimes need to clear the cache. SQL Server provides you with tools to clear both data and execution plans from cache. To clear data from cache globally, use the following command: DBCC DROPCLEANBUFFERS;

SQL Server supports the BULK rowset provider, which allows you to use the BULK engine to load le data as a rowset or as a single large object (LOB) value. You specify BULK as the provider in the OPENROWSET function, along with other options that are relevant to your request. For example, the following code returns the data from a le called shippers.txt as a row set, based on the format le shippers.fmt:

We can view this spatial data by executing this query:

SELECT shipperid, companyname, phone FROM OPENROWSET(BULK 'c:\temp\shippers.txt', FORMATFILE = 'c:\temp\shippers.fmt') AS S;

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SELECT GEOM.STBuffer(.1) FROM Points UNION ALL SELECT GEOM.STBuffer(.02) FROM Lines UNION ALL SELECT GEOM .STBuffer(.02) FROM Polygons;

To clear execution plans from cache globally, use the following command: DBCC FREEPROCCACHE;

This code generates the following output:

shipperid ---------1 2 3 companyname -------------Shipper GVSUA Shipper ETYNR Shipper ZHISN phone --------------(503) 555-0137 (425) 555-0136 (415) 555-0138

Figure 14-7 provides an illustration of this new data:

To clear execution plans of a particular database, use the following command: DBCC FLUSHPROCINDB(<db_id>);

More Info You can download the les used in this section s examples from http://www.insidetsql.com as part of the book s source code download. For more information, see the Introduction. The format le is the same format le you re familiar with when working with bcp.exe or BULK INSERT. In fact, you can generate it either manually or by using bcp.exe as you have used it thus far. Besides FORMATFILE, you can also specify other read-related bulk options: CODEPAGE, ERRORFILE, FIRSTROW, LASTROW, MAXERRORS, and ROWS_PER_BATCH. You can also use the BULK provider to specify a le source for an INSERT statement. This way, you can ef ciently utilize the BULK engine. In such an INSERT statement, you can control insert options using table hints, including KEEPIDENTITY, KEEPDEFAULTS, IGNORE_ CONSTRAINTS, IGNORE_TRIGGERS, and TABLOCK. To demonstrate inserting a rowset into a table using the BULK provider, rst run the following code, which creates the Shippers table in the tempdb database:

-- In the outer level, create temp table #T with a single dummy column CREATE TABLE #T(dummycol INT); -- Within a dynamic batch: -Alter #T adding the columns you need -Alter #T dropping the dummy column -Open another level of dynamic execution -Populate #T EXEC(' ALTER TABLE #T ADD ' + @column_defs + '; ALTER TABLE #T DROP COLUMN dummycol; EXEC(''' + @insert + ''')'); GO -- Back in the outer level, access #T in a new batch SELECT * FROM #T; -- Cleanup DROP TABLE #T;

USE tempdb; IF OBJECT_ID('dbo.Shippers') IS NOT NULL DROP TABLE dbo.Shippers; CREATE TABLE dbo.Shippers ( shipperid INT NOT NULL PRIMARY KEY, companyname NVARCHAR(40) NOT NULL, phone NVARCHAR(24) NOT NULL );

This generates the following output:

The following code is an example of inserting the contents of a le called shippers.txt into the target table Shippers, using shippers.fmt as the format le:

Be careful not to use these commands in production environments because, obviously, clearing the cache will have a performance impact on the whole system. After clearing the data cache, SQL Server will need to physically read pages accessed for the first time from disk. After clearing execution plans from cache, SQL Server will need to

INSERT INTO dbo.Shippers WITH (TABLOCK) (shipperid, companyname, phone) SELECT shipperid, companyname, phone FROM OPENROWSET(BULK 'c:\temp\shippers.txt', FORMATFILE = 'c:\temp\shippers.fmt') AS S;

col1 col2 ----------- ----------10 20.30

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