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NCLOB, depending on whether the XML le contains regular character data or Unicode data.
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To demonstrate using the BULK rowset provider to insert le content as a scalar LOB value, rst create the CustomerData table by running the code in Listing 10-1.
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LISTING 10-1 Creating the CustomerData table
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IF OBJECT_ID('dbo.CustomerData') IS NOT NULL DROP TABLE dbo.CustomerData; CREATE TABLE dbo.CustomerData ( custid INT NOT NULL PRIMARY KEY, VARCHAR(MAX) NULL, txt_data NVARCHAR(MAX) NULL, ntxt_data binary_data VARBINARY(MAX) NULL, XML NULL xml_data );
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Data Modi cation
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As an example, the following INSERT statement inserts a new customer into the CustomerData table, with custid 101, and an XML value read from the le xml le101.xml into the xml_data column:
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INSERT INTO dbo.CustomerData(custid, xml_data) VALUES( 101, (SELECT xml_data FROM OPENROWSET( BULK 'c:\temp\xmlfile101.xml', SINGLE_CLOB) AS F(xml_data)));
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Similarly, the following UPDATE statement reads the three les text le101.txt, unicode le101.txt, and binary le101.jpg and updates customer 101 s columns: txt_data, ntxt_data, and binary_data, respectively:
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UPDATE dbo.CustomerData SET txt_data = (SELECT txt_data FROM OPENROWSET( BULK 'c:\temp\textfile101.txt', SINGLE_CLOB) AS F(txt_data)), ntxt_data = (SELECT ntxt_data FROM OPENROWSET( BULK 'c:\temp\unicodefile101.txt', SINGLE_NCLOB) AS F(ntxt_data)), binary_data = (SELECT binary_data FROM OPENROWSET( BULK 'c:\temp\binaryfile101.jpg', SINGLE_BLOB) AS F(binary_data)) WHERE custid = 101;
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Run the following code to examine the row in CustomerData for customer 101:
SELECT * FROM dbo.CustomerData WHERE custid = 101;
You get the following output, shown here in abbreviated form and in three parts because of the length of the output row:
custid txt_data ------- --------------------------------------------------101 This file contains character data for customer 101 custid ntxt_data ------- ------------------------------------------------101 This file contains Unicode data for customer 101 custid binary_data xml_data ------- --------------------- --------------101 0xFFD8FFE000104A46... <ShowPlanXML...
Minimally Logged Operations
SQL Server can perform minimal logging with certain kinds of operations. An operation done with minimal logging can run substantially faster than when done with full logging. One reason for the big difference is that writes to the transaction log are done sequentially, so in many cases writes to the log become the bottleneck of the operation. The following operations can bene t from minimal logging: SELECT INTO, index operations, operations on large object values, BULK INSERT, bcp.exe, INSERT SELECT FROM OPENROWSET(BULK . . .), and, new to SQL Server 2008, regular INSERT SELECT.
Inside Microsoft SQL Server 2008: T-SQL Querying
More Info For more information on Bulk Import/Export, see Sunil Agarwal s blog posts on the subject: http://blogs.msdn.com/sqlserverstorageengine/archive/tags/Bulk+Import_2F00_Export/ default.aspx. SQL Server has certain requirements for minimal logging. First of all, the recovery model of the target database cannot be FULL; rather, minimal logging is possible only if the recovery model is SIMPLE or BULK_LOGGED. As far as SELECT INTO is concerned, that s the only requirement. All other insert methods (BULK INSERT, bcp.exe, INSERT SELECT FROM OPENROWSET(BULK . . .), and INSERT SELECT) have additional requirements. Besides the requirement that the target database have a non-FULL recovery model, there are two requirements on the target table: it must not be marked for replication, and one of the following must be true: The target is a heap, and you specify TABLOCK. The target can be empty or nonempty, and no trace ag is required. The target is an empty B-tree, and you specify TABLOCK. No trace ag is required. The target is an empty B-tree, and trace ag 610 is on. The TABLOCK option is not required. This case is new in SQL Server 2008. The target is a nonempty B-tree, and trace ag 610 is on minimal logging will apply to new key ranges that allocate and populate new pages. The TABLOCK option is not required. This case is also new in SQL Server 2008. Note that while a database backup is running, minimal logging is disabled temporarily. The backup does not prevent the operation from running it just causes it to perform full logging. For now this list of requirements might be a bit overwhelming. I provide it here for reference purposes. I ll provide more details and examples shortly and also show you how to analyze the logging behavior yourself. As mentioned, regular INSERT SELECT statements in SQL Server 2008 can also bene t from minimal logging. Note, however, that some aspects of optimized bulk imports do not apply to INSERT SELECT but do apply to the other bulk import methods (BULK INSERT, bcp.exe, and INSERT SELECT FROM OPENROWSET(BULK . . .)). I ll collectively call the last three methods the other methods. The other methods support a table-level bulk update lock that reduces lock overhead while still allowing parallel bulk imports from multiple processes. The INSERT SELECT statement supports the TABLOCK option, but it results in an exclusive table lock that only one process can hold at a time. The other methods also support de ning a batch size that indicates after every how many rows to commit, while INSERT SELECT doesn t support this option. You will nd other such differences between the other methods and INSERT SELECT; for details please consult SQL Server Books Online.
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