Read e-book online Microsoft SQL Server 2000 Performance Optimization and PDF

By England K.

ISBN-10: 1555582044

ISBN-13: 9781555582043

In his moment quantity on SQL Server, England (a advisor and coach) takes you thru the targets of functionality tuning and the weather of the actual database layout strategy, together with facts quantity research and transaction research. He then describes SQL Server garage buildings, introduces clustered and nonclustered indexes, the question optimizer, the interplay among SQL Server and home windows 2000 within the region of CPU, and reminiscence and disk I/O. the rest chapters clarify SQL Server locking mechanism, functionality tracking, and offers a functionality tuning aide-m<'e>moire.

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Sample text

Three pages are full, and the fourth page is partly filled. 4: Customers table with no indexes present We will assume, for clarity, that a database page only holds three rows and that only the customer_lname and customer_fname columns are shown. Suppose we wish to add a new row. Where is it stored? 5. We shall see shortly that this behavior is true even if there are nonclustered indexes present on the table. Only the creation of a clustered index can modify this behavior. 5: Insertion at the end of a table One can imagine that in a multiuser system many users will be attempting to insert customer rows.

1: Structure of the clustered index At any given level in the index the pages are linked together. 2 emphasizes the linkage. 2 shows how index pages are linked together, and this is true regardless of whether the index is a clustered index or nonclustered index. 2: Index pages are linked together The entries in the index pages contain a key value and a pointer to the next index page at the next lowest level starting with that key value, plus some control information. The pointer in a clustered index is a page number.

There are 10,000 bank accounts for 5,000 customers. These are managed by 100 branches. Since we will be creating indexes frequently as we progress through the book, there are no indexes created in the basic database. For the same reason, the tables are also assumed to have no primary key constraints or foreign key constraints. 1 Introduction There are many bells and whistles that can be tweaked to improve SQL Server performance. Some will provide a more positive benefit than others; however, to really improve performance, often with dramatic results, the database designer is well advised to concentrate his or her efforts in the area of indexing.

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