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 pursuits of functionality tuning and the weather of the actual database layout technique, together with info 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 sector of CPU, and reminiscence and disk I/O. the rest chapters clarify SQL Server locking mechanism, functionality tracking, and gives a functionality tuning aide-m<'e>moire.

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Extra info for Microsoft SQL Server 2000 Performance Optimization and Tuning Handbook

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The size of the index will be larger if space is reserved in it, and in the case of a clustered index the number of data pages in the table will also be greater, but this does mean that the point when SQL Server needs to page split will be delayed. When SQL Server starts to split pages, fragmentation is said to occur. If many rows are inserted into a clustered index, such that page splits occur, many data pages will be chained into the table and the table will become fragmented. This affects both insertion and scan efficiency, and so we want to avoid it.

17 we have the structure of the Accounts table row in our BankingDB database. The Accounts table has five fixed-length columns. The first three columns are of type integer, the fourth column is of type money, and the last column is of type char(400). 17: A row containing only fixed-length columns The first two bytes are used for status bits. The first status byte holds information that tells SQL Server, for example, whether the row is a primary data row or a forwarded row (described in Chapter 3).

Previously we mentioned that the index entries at the leaf level of a nonclustered index pointed directly at the data rows and these pointers, known as Row IDs, are of the form Page ID plus a row number on the data page. A Page ID is of the form File ID and database page number. We have just seen that when a page split occurs in a clustered index, rows can migrate from the old page to the newly chained-in page. So does this mean that the Row IDs for these rows are now incorrect? 0 this is exactly what this would mean.

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Microsoft SQL Server 2000 Performance Optimization and Tuning Handbook by England K.


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