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'SqlCommand_DataSet2XML Imports System Imports System.IO Imports System.Data Imports System.Data.SqlClient Imports System.Xml Module Module1 Sub Main() 'Instantiate the SqlCommand object and the connection Dim objConn As New SqlConnection("Server=(local);" _ & "Database=Asset;" _ & "Integrated Security=SSPI") objConn.Open() 'prepare a data set Dim objCmd As New SqlCommand("SELECT * FROM Inventory " _ & "where InventoryId = 83 ", objConn) Dim objAdpt As New SqlDataAdapter(objCmd) Dim objDs As New DataSet("CompleteInventory") objAdpt.Fill(objDs, "Inventory")

SQL Server 2000: A Beginner s Guide by Du an Petkovic SQL Server 2000 Design & TSQL Programming by Michelle Poolet and Michael D. Reilly

People often use the term database to describe what are really two different types of objects. The term can be associated with a physical or virtual structure used to store and manage information. It does not even matter whether it is implemented on a computer in the form of one kind of file or another, or as a set of index cards in a library. In both cases, we refer to the structure used to store information as a database. The same word can be used in reference to a system that is used to access information and manage database storage. Of course, this usage implies that such a system is implemented as computer software. This type of database is often called a relational database management system (RDBMS). Depending on the implementation, an RDBMS can also be labeled a database server.

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PROBLEM: print 'Unable to eliminate lease amounts from the database!' rollback transaction return 1

Unlike Commit statements, only one Rollback statement is required to close a set of nested transactions. In fact, if more than one Rollback statement is executed, SQL Server will raise another error.

SQL Server places locks on data that have been modified by a transaction to prevent other users from further changing the data until the transaction is committed. This feature can lead to problems if a transaction takes too long to complete.

'prepare the destination file Dim objFile As New FileStream("DiffGramInvDelete.xml", _ & FileMode.Create) Dim objStrmWriter As New StreamWriter(objFile) 'delete row objDs.Tables(0).Rows(0).Delete() 'write DiffGram that will delete the record objDs.WriteXml(objStrmWriter, XmlWriteMode.DiffGram) objStrmWriter.Close() objFile.Close() objConn.Close() End Sub End Module

NOTE: There is no exact definition of too long. The longer a transaction works, the greater the likelihood that problems will occur.

Some of the problems that might occur if a long transaction is present in the database include the following:

Other users are blocked. They will not be able to access and modify data. The transaction log fills up. (SQL Server 2000 and SQL Server 7.0 will automatically increase the size of transaction log, but you could fill your disk as well.) Most of the time, transaction log work is performed in memory. If all available memory is used before the transaction is complete, SQL Server will start saving changes to disk, thus reducing the overall performance of the server.

TIP: You should be particularly aware of concurrency problems because they are the problems most likely to happen. While you are developing applications, you will probably work alone (or in a small group) on the server, but the situation will change drastically when you place 50, 250, or 5,000 concurrent users on the production server.

A database owner explicitly issues a checkpoint command to perform a checkpoint in that database. The log is getting full (more than 70 percent of capacity) and the database option trunc. log on chkpt. is set. A checkpoint is triggered to truncate the transaction log and free up space.

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