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DataSet ds = new DataSet(); SqlXmlAdapter da = new SqlXmlAdapter(cmd); da.Fill(ds); dataGridView1.DataSource = ds.Tables[0].DefaultView; } The code creates a SqlXmlCommand object as before. It then creates a new instance of the DataSet and SqlXmlAdapter classes. The SqlXmlAdapter accepts the SqlXmlCommand object as a parameter and thus the SELECT query (or stored procedure) is passed to it. The Fill() method of SqlXmlAdapter is then called by passing a DataSet object as a parameter. The Fill() method populates the DataSet with the results returned from the query. Finally, the DataSet is bound to the DataGridView control.

In this chapter, we explored the concept of parallel execution in Oracle. I started by presenting an analogy to help frame where and when parallel execution is applicable namely, when you have longrunning statements or procedures and plenty of available resources. Then we looked at how Oracle can employ parallelism. We started with parallel query and how Oracle can break large serial operations, such as a full scan, into smaller pieces that can run concurrently. We moved on to parallel DML (PDML) and covered the rather extensive list of restrictions that accompany it. Then we looked at the sweet spot for parallel operations: parallel DDL. Parallel DDL is a tool for the DBA and developer alike to quickly perform those large maintenance operations typically done during off-peak times when resources are available. We briefly touched on the fact that Oracle provides parallel recovery before we moved on to procedural parallelism. Here we saw two techniques for parallelizing our procedures: one where Oracle does it and the other where we do it ourselves. If we re designing a process from scratch, we might well consider designing it to allow Oracle to parallelize it for us, as the future addition or reduction of resources would easily permit the degree of parallelism to vary. However, if we have existing code that needs to quickly be fixed to be parallel, we may opt for DIY parallelism, which we covered by examining two techniques, manual and automatic. Each uses either rowid ranges or primary key ranges, which both use DBMS_JOB or DBMS_SCHEDULER to carry out the job in parallel in the background for us.

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ow that we ve created the tables, we could stop at this point and just work with our data from here. However, this would not be a good decision. As soon as any table contained a reasonable amount of information, and we wished to find a particular record, it would take SQL Server a fair amount of time to locate it. Performance would suffer and our users would soon get annoyed with the slowdown in speed. In this scenario, the database is like a large filing cabinet in which we have to find one piece of paper, but there s no clear filing system or form of indexing. If we had some sort of cross-reference facility, then it would likely be easier to find the information we need. And if that cross-reference facility were in fact an index, then this would be even better, as we might be able to find the piece of paper in our filing cabinet almost instantly. It is this theory that we need to put into practice in our SQL Server database tables. Generally, indexing is a conscious decision by a developer who favors faster conditional selection of records over modification or insertion of records. In this chapter, you ll learn the basics of indexing and how you can start implementing an indexing solution. This chapter covers the following topics: What an index is Different types of indexes Size restrictions on indexes Qualities of a good index and a bad index How to build an index in code as well as graphically How to alter an index Let s begin by looking at what an index is and how it stores data.

.NET provides an unprecedented extensibility for the remoting framework. The layered architecture of the .NET Remoting framework can be customized by either completely replacing the existing functionality of a given tier or chaining new implementation with the baseline .NET features. Before working on the framework and its extensibility, I really encourage you to get a thorough understanding of the existing layers and their inner workings in this architecture. This chapter gives you that information.

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