Download Inside Microsoft SQL Server 7.0 (Mps) by Ron Soukup PDF
By Ron Soukup
A must-read for builders and IT execs who have to comprehend Microsoft SQL Server from the interior out. Written through a Microsoft SQL Server guru, this complete consultant presents up-to-date, authoritative suggestion for fitting, administering, and programming with model 7.0. The CD comprises product review documentation, pattern code and scripts, white papers, and a benchmarking equipment.
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In reality many more rows and index entries are likely to be found. 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.
In this root page there will be a number of key values, and in our clustered index these are Adams and James. SQL Server will look for the highest key value not greater than Green, which will be Adams. In a clustered index an index entry consists of the index key plus a pointer, which is a page number. The pointer held in the Adams key entry points to page 58, and so index page number 58 will be retrieved. Since page 58 is still an index page, SQL Server will look for the highest key value not greater than Green.
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. Each PFS page covers an 8,000page range. When a search is made to look for free space, the PFS page is consulted to see which page in an extent belonging to the table or index may have enough free space. 0. In these previous versions, if there were no clustered index on the table, new rows were always added at the end—that is, inserted into the last page.