rebuild index sql server

What is an index? Take the directory pages (indexes) of the Chinese dictionary for example: just as the Chinese characters in the Chinese Dictionary are stored by page, the data records in SQL Server are also stored by PAGE, and the size of each page is generally 4 K. To speed up searching, Chinese characters (words) are usually sorted by pinyin, strokes, radi

What is an index Take the table of Contents page of Chinese dictionary (index) metaphorically: Just as Chinese characters are stored as pages in a dictionary, data records in SQL Server are stored on a per-page basis, typically 4K in volume. In order to speed up the speed of the search, the Chinese word (word) code gen

Tags: style blog color ar using SP data div onWhat is the index of the Chinese Dictionary of the Directory page (index) analogy: Just as Chinese characters are stored by page, the data records in SQL Server are stored on pages, and the capacity of each page is typically 4K. In order to speed up the search, Chinese word

What is an index? Take the directory pages (indexes) of the Chinese dictionary for example: just as the Chinese characters in the Chinese Dictionary are stored by page, the data records in SQL Server are also stored by PAGE, and the size of each page is generally 4 K. To speed up searching, Chinese characters (words) are usually sorted by pinyin, strokes, radical

the disk's head movement. Conversely, if their physical storage order is consistent with the logical order, SQL Server can read it one time because it reads a block (8 pages) at a time. Well, when we get to the basics, we'll see what is fragmentation.What is index fragmentationIndex fragmentation can be divided into two categories: internal

There are two examples in the previous two blogs to demonstrate the content to be told. Some methods for viewing the database status are mentioned, which is not very comprehensive. This blog lists several of the statuses and data that we will use in subsequent blogs. And how to clear the cache in the test.The link addresses of the previous two blogs are as follows: Basic SQL Server

--Index and Views (view)-- --indexing (Index)----Overview : 　　 the index in the database is similar to the book's Directory, which contains a new order of a column or combination of columns in the table as a pointer, implementing the logical ordering of the database in the table。index is created on a field in a

Technical preparationBased on SQL Server2008R2, Microsoft uses a simpler case Library (Northwind) for parsing.IntroductionThe so-called index application is in our daily write T-SQL statement, how to use the existing index, then analysis is what we write query conditions, in fact, most of the situations are nothing mor

', UNION allSELECT 10002, ' NULL ', 24CREATE INDEX idx_test_n2 on TEST (name,age);UPDATE STATISTICS TEST with FULLSCAN;If the predicate is located in the Union index and not in the first column, is null or is the NOT NULL will not go index it?As shown above, it changes from an index lookup to an

is an internal method of SQL Server orchestration data. It provides a way for SQL Server to orchestrate query data what is an indexTake the Catalogue page (index) of the Chinese dictionary for example: Just as Chinese characters are stored on pages, the data records in

Tags: style color using strong data reWhat is an indexTake the catalogue page of the Chinese Dictionary (index) analogy: Just as Chinese characters are stored on pages, SQL Server data records are also stored on a per page basis, and each page capacity is typically 4K . In order to speed up the search, Chinese word (word) code generally have by pinyin, strokes, r

performance.Nonclustered index sub-overlay index, unique index, composite index (of course, clustered index also has compound, compound two words, just explain index, reference Multi-column), General nonclustered indexIt is bette

Tags: tar idt val ext http about csdn Select MoDfrom:http://blog.csdn.net/tjvictor/article/details/4370771XML indexes in SQL Server fall into two categories: primary XML indexes and secondary XML indexes. The secondary XML index is divided into: PATH secondary XML index, VALUE Secondary XML

organization.Body Defined In SQL Server, indexes are organized by the B-tree structure. Each page in the index B-tree is called an index node. The top node of the B-tree is called the root node. The underlying node in the index is called a leaf node. Any

In SQL Server, non-clustered indexes can be considered as a table containing clustered indexes. but compared to the actual table. the number of columns in tables stored in non-clustered indexes is much narrower, because non-clustered indexes only contain columns of non-clustered indexes in the original table and pointers to the actual physical table. In addition, for non-clustered

Objective In the course of learning the SQL 2012 Basic tutorial, you will be interspersed with other content from time to time, believe that the children's shoes that read the SQL Server T-SQL Basic tutorial know that all the contents of the previous writing are not all excerpts from the contents of the book, if so it

Tags: find combined with server other LTE art definition technology share defaultObjectiveIn this section we continue to talk about index knowledge, before we clustered index, nonclustered index and overlay index, there is also a filter