server index

Select OBJECT_ID (' dbo. Ft_cfp_trade_subaccount ')SELECT * from sys.partitions where [object_id]=1467256382SELECT * from Sys.allocation_units where container_id=72057594139049984SELECT * FROM sys.system_internals_allocation_units where container_id=

The SQL Server version is R2.SQL statement (source) for querying database index fragmentation conditions:SELECT object_name (Ind. OBJECT_ID) as TableName, ind.name as IndexName, Indexstats.index_type_desc as Indextype, Indexstats.avg_fragmentation_

This article is part of the "Stairway series: Steps for SQL Server Indexing"Indexes are the basis of database design and tell developers to use the database with regard to the designer's intentions. Unfortunately, when performance problems arise,

clustered index, nonclustered index, nonclustered unique indexWe all know that establishing an appropriate index can improve query speed and optimize queries. First, whether a clustered or nonclustered index is a B-tree structure . The

Start from Create By using the explicit CREATE INDEX command As an implied object when creating a constraint Implicit indexes created with constraintsAn implicit index is created when you add one of the following two constraints to

--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

Reference Original: http://www.cnblogs.com/tjy9999/p/4494662.html1. Nonclustered indexesSET STATISTICSIo on SET STATISTICSTime on --1. No index (logical reads 568)SELECTFirstName, LastName fromDbo. ContactWHERELastName like 's%' --To create a

　　SQL Server index structure and its use (i)FreedkFirst, understand the index structure in a comprehensible senseIn fact, you can interpret an index as a special kind of directory. Microsoft's SQL Server provides two types of indexes: Clustered

The concept of an indexThe purpose of the index: our data query and processing speed has become a measure of the success of the application system standards, and the use of indexes to speed up data processing speed is often the most commonly used

The basic unit of data storage in SQL Server is the page. The disk space allocated by the data file (. mdf or. ndf) in the database can be logically divided into pages (numbered from 0 to n consecutively). Disk I/O operations are performed at the

Transferred from: http://www.cnblogs.com/chenmh/p/3780221.htmlClustered indexOverviewThe concept of index and table architecture has always been the discussion of a lot of topics, including the table of various storage forms is the focus of

Unique indexIf the primary key is not set to a clustered index when it is created, it must be a unique nonclustered index. In fact, the unique index, the name Incredibles, is that it requires the value on that column to be unique. A unique index

What is an index A database index is a structure that sorts the values of one or more columns of a table, and the relationship of the index to the table data is similar to the relationship between the catalog and the content of the book. There are

In a database with a large number of transactions, tables and indexes are fragmented over time. Therefore, to improve performance, you should periodically check the fragmentation of tables and indexes, and defragment them with a lot of fragmentation.

--Requirements change, need to add a foreigner name to the F_username field of the T_login table, the previous set of varchar (10) is not enough, the negotiation decision to change to varchar (30), when executing, the message index ' Uq_f_username '

Original article: StairwaytoSQLServerIndexes: Level2, DeeperintoNonclusteredIndexes this article is part of the advanced series of SQL Server indexes (StairwaytoSQLServerIndexes. In Level 1 Original article: StairwaytoSQLServerIndexes: Level2,

Basic SQL Server Index knowledge (2) ---- clustered index, non-clustered Index [From] http://blog.joycode.com/ghj/archive/2008/01/02/113291.aspx As I needed to train my colleagues on database indexing knowledge, I collected and sorted out this

Original article address: Stairway to SQL Server Indexes: Level 2, Deeper into Nonclustered Indexes This article is part of the SQL Server Index advanced series Stairway to SQL Server Indexes. The first level introduces non-clustered indexes in SQL

Importance of Indexes Indexes in database performance optimization are definitely a heavyweight factor. It can be said that improper indexing and other optimization measures will be meaningless. Clustered Index(Clustered index)Non-clustered

SQL Server Index Structure and usage (III)Author: freedk I. An in-depth understanding of the index structureIi. Improve SQL statements General paging display and storage process for small data volumes and massive data Creating a Web application