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asp.net core ocr

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The hint TABLOCK tells SQL Server to take a table lock during the insert operation, minimizing lock overhead. In the case of an INSERT SELECT FROM OPENROWSET(BULK . . .) statement, the TABLOCK hint has special meaning. It tells SQL Server to obtain a bulk update table-level lock that will allow an optimized BULK operation while also allowing other sessions to obtain a bulk update table-level lock as well. This way multiple processes can run such optimized bulk inserts in parallel. If you re asking yourself why use the INSERT SELECT FROM OPENROWSET(BULK . . .) statement rather than the BULK INSERT statement or the bcp.exe tool, the rst statement has an advantage. Unlike the BULK INSERT command or the bcp.exe tool, the INSERT SELECT FROM OPENROWSET(BULK . . .) statement allows you to apply usual query manipulation on the source. This means that you can use table operators like joins, APPLY, PIVOT, UNPIVOT, lter data with the WHERE clause, group data with the GROUP BY clause, and so on. The BULK rowset provider can also be used to insert the content of a le as a scalar LOB value in an INSERT, UPDATE, or MERGE statement. You use the OPENROWSET function and specify the BULK option, the source lename, and one of three options for the type of data: SINGLE_CLOB for regular character data, SINGLE_NCLOB for Unicode data, and SINGLE_ BLOB for binary data.

generate new execution plans for queries. Also, be sure that you are aware of the global impact of clearing the cache even when doing so in development or test environments.

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SQL Server 2008 supports the caching of temporary objects across repeated calls of routines . This feature is applicable to local temporary tables, table variables, and table-valued functions used within routines such as stored procedures, triggers, and user-defined functions . When the routine finishes, SQL Server keeps the catalog entry . If the object is smaller than 8 MB, SQL Server keeps one data page and one IAM page, and uses those instead of allocating new ones when the object is created again . If the object is larger than 8 MB, SQL Server uses deferred drop, and immediately returns control to the application . This feature results in reduction of contention against system catalog tables and allocation pages, and in faster creating and dropping of temporary objects . I ll demonstrate caching of temporary objects (across repeated calls of routines) through an example . Run the following code to create a stored procedure called TestCaching that creates a temporary table called #T1 and populates it with a few rows:

Note When you want to load XML data from a le, you use either SINGLE_CLOB or SINGLE_

SET NOCOUNT ON; USE tempdb; IF OBJECT_ID('dbo.TestCaching', 'P') IS NOT NULL DROP PROC dbo.TestCaching; GO CREATE PROC dbo.TestCaching AS

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.

SQL Server 2005 introduces more than 70 dynamic management objects, including DMVs and DMFs. These contain extremely useful information about the server that you can use to monitor SQL Server, diagnose problems, and tune performance. Much of the information provided by these views and functions was never available in the past. It is time very well spent to study them in detail. In these books, I will make use of the ones that are relevant to my discussions, but I urge you to take a close look at others as well. You can find information about them in Books Online, and I will also give you pointers to additional information at the end of the chapter.

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 );

CREATE TABLE #T1(n INT, filler CHAR(2000)); INSERT INTO #T1 VALUES (1, 'a'), (2, 'a'), (3, 'a'); GO

10

STATISTICS IO is a session option that is used extensively throughout these books. It returns I/Orelated information about the statements that you run. To demonstrate its use, first clear the data cache: DBCC DROPCLEANBUFFERS;

Run the following query to determine which entries representing temporary tables exist in the system catalog:

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:

SELECT name FROM tempdb.sys.objects WHERE name LIKE '#%';

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)));

Then run the following code to turn the session option on and invoke a query: SET STATISTICS IO ON; SELECT orderid, custid, empid, shipperid, orderdate, filler FROM dbo.Orders WHERE orderdate >= '20060101' AND orderdate < '20060201';

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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