Download Microsoft SQL server 2000 : performance optimization and by Ken England Microsoft Certified Systems Engineer and a PDF
By Ken England Microsoft Certified Systems Engineer and a Microsoft Certified Trainer
Learn from a SQL Server functionality authority the way to make your database run at lightning speed.
Ken England's SQL Server 6.5 functionality Optimization and Tuning guide is famous by way of SQL Server directors because the integral advisor to tuning and optimization. Now he is revised the ebook for Microsoft's new SQL Server 2000, the main complicated and strong model but of SQL Server, which takes complete benefit of home windows 2000's new processing services. The ebook info the standards that be sure database functionality and provides readers instruments, suggestions and most sensible practices they could use to tweak and song SQL Server's configuration and operation. Readers will how one can improve functionality via stable actual layout and potent inner garage buildings. The ebook spells out tools for developing effective indexes and methods for tuning SQL Server's new question optimizer.
- A re-creation of the authoritative and bestselling advisor, SQL Server 6.5 functionality Optimization and Tuning instruction manual, 1555581803
- Targets SQL Server 2000
- Helps IT pros run SQL Server extra powerfully and successfully and optimize it for e-commerce and data management
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Additional info for Microsoft SQL server 2000 : performance optimization and tuning handbook
The IAM pages are the only structures that link the pages in a table together. Finally, our last special page is a PFS page. A PFS page holds the information that shows whether an individual page has been allocated to table, index, or some other structure. It also documents how free an allocated page is. For each page, the PFS has a bitmap recording whether the page is empty, 1 percent to 50 percent full, 51 percent to 80 percent full, 81 percent to 95 percent full, or 96 percent to 100 percent full.
Create a table, T1, with a single column of data type CHAR(8000). A single row only can fit onto a database page. 2. , EXEC sp_spaceused T1). 3. Insert another row, checking the space reserved. What you will find is that after each row is inserted, the data column (the amount of space used by data in the table) is incremented by 8 KB—that is, a single page from a mixed extent. The reserved column (the amount of total reserved space for the table) is also incremented by 8 KB. Note The reserved column displays 8 KB more than the data column, since a page is used in the table's page allocation to hold a special structure called an Index Allocation Map (IAM), which we will discuss later.
Perhaps we have a customer named Mary Smith. Now we have an interesting scenario. If the clustered index is now traversed from the top searching for a key of Smith, two rows will be found. Clearly this is nonsense, so how does SQL Server find the correct Smith? The answer can be found in the way that duplicate clustered index key values are handled. If a clustered index is not created as a unique index, then duplicate key values will be allowed in the index. In our example this is not unreasonable—some customers will have the same last name.