sql server index tuning wizard

Label:It is understood that the vast majority of developers understand the index is smattering, limited to the majority of daily work without opportunities, and what is not necessary to care about the index, it is a query is too slow to find the query criteria to build an index OK, which day and a query slow, and then build an

BKJIA exclusive Article] low carbon index: here we use Intel Xeon X7500 processor TDP as the standard for computing power consumption TDP = 130 W/h = 2.167 W/m = 0.036 W/s) to facilitate computing and visualization ). In addition, according to data from the China Forestry Administration, a tree absorbs 5.023 kg of carbon dioxide a day and generates 0.785 kg of carbon dioxide per power. If the execution time of the database is reduced from 27 seconds t

Tags: Group impact dex STS HTML tail file without MicrosoftReference Original: http://www.cnblogs.com/tjy9999/p/4494662.html 1. Nonclustered indexes SET STATISTICSIo on SET STATISTICSTime on --1. No index (logical reads 568) SELECTFirstName, LastName fromDbo. ContactWHERELastName like 's%' --To create a nonclustered index IF EXISTS(SELECT * fromSys.indexesWHERE object_id = object_id('Person.Contact'

First, the concept of bookmark searchBookmarks can help SQL Server quickly direct from the nonclustered index entry to the corresponding line, but I can actually say a few words about it.　　If the table has a clustered index (the section structure), then the bookmark is the clustered

From http://www.20cn.net " In application systems, especially online transaction processing systems, data query and processing speed have become the criteria for measuring the success or failure of application systems. Using indexes to accelerate data processing has become an optimization method accepted by the majority of database users. Based on a good database design, using indexes effectively is the foundation for SQL

server| Index In the application system, especially in the online transaction processing system, the data query and processing speed has become the standard to measure the success or failure of the application system. And the use of index to speed up data processing has become the majority of database users to accept the optimization method. Based on good databas

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SQL Server index maintenance2012-03-08 00:30:09|Category: Default Categories | Tags:SQL Server Index | Report | Font size Subscription Pages Extents (pages and extents)The most basic data storage unit for SQL

exceeds 8 pages, the data page is allocated from the consistent extension. The space page is dedicated to the allocation and management of data spaces, including: PFS pages (page free space): Record whether a page is assigned, in a mixed or consistent extension, and how much space is available on the page; Gam page (Global allocation MAP) and Sgam page (secodary Global allocation map): Used to record the location of an idle extension or a mixed extension containing free pages. Sqls Comprehensiv

Label:In today's scale OLTP system, it is a good way to solve the problem by replicating multiple copies in order to alleviate the single point of reading and writing pressure in the database, especially the read pressure.The SQL Server transactional replication transactional Replication is the most common form of replication we take. Some of the previous articles always introduce some basic constructs,Lack

In application systems, especially online transaction processing systems, data query and processing speed have become the criteria for measuring the success or failure of application systems. Using indexes to accelerate data processing has become an optimization method accepted by the majority of database users. Based on a good database design, using indexes effectively is the foundation for SQL Server to

performance gains of indexes, it's very difficult to actually build enough correct and necessary indexes at the outset, how can we infer which tables need to be indexed and which ones are not built correctly?Typically, SQL Server executes a query script with an existing index, assuming that no index is found he will v

pages, the data page is allocated from the consistent extension. The space page is dedicated to the allocation and management of data spaces, including: PFS pages (page free space): Record whether a page is assigned, in a mixed or consistent extension, and how much space is available on the page; Gam page (Global allocation MAP) and Sgam page (secodary Global allocation map): Used to record the location of an idle extension or a mixed extension containing free pages. Sqls Comprehensive utilizat

Objective In this section, we'll talk about indexing knowledge, followed by date types in data types, short content, in-depth understanding. Force Index query criteria We also spoke a little bit about forcing the index query, and we'll go through the whole story in this section. (1) SQL Server uses default

data and index information, and SQLS uses 4 types of data pages to manage tables or indexes, which are IAM pages, data pages, text/image pages, and index pages. When the 8 data pages in an extension area contain both a spatial page and a data or index page, called a mixed extension (Mixed Extent), each table starts with a mixed extension, and conversely, is call

, one is not perfect function also dare to take Out (2000) The second functional architecture of the outstanding design makes the function has a strong continuity and Scalability (2005 2000 of the function to retain and improve). The optimization tool is simple to use 1: Use SQL Server Porfiler (Event Viewer) to record all the steps of the operation database in the business system and save it as a working

is possible that the clustered index is a non-unique clustered index, which could cause a sort error, so SQL Server A unique key is generated internally to make all duplicate keys unique, and this four-byte value is not visible to the user and is added only if the clustered key needs to be unique for use in a nonclust

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

if you want to index the primary key, candidate key, appropriate foreign key, potential query column, do some analysis before building. Do understand That:same Database + Different situation = Different indexing Whether it's during the day or off-peak processing, whether it's on-line processing or report processing of a database copy, the indexes are different in different cases. Do has a Primary Key on every Table Although the primary key is not req

Introduction to the index:Indexes are clustered and nonclustered, and the index in the database is similar to a book's directory, where you can quickly find the information you want in a book, without having to read through the books.The main purpose of the index is to improve the performance of the SQL Server system,