sql server index tuning wizard

ObjectiveIn the previous few we analyzed a series of SQL Server-related performance tuning, which I divided into two modules.The first module focuses on the basic content of the master, a total of 6 articles to complete, covering a series of basic algorithms, the detailed analysis of how to view the execution plan, master Execution Plan optimization points, and a

if the amount of data is small, create a table and insert it in order to mitigate the resources of the system tables. If a temporary table is used, TRUNCATE TABLE first and then drop table when all temporary tables are finally explicitly deleted, which avoids longer locking of the system tables. Index You should first consider establishing an index on the columns involved in where and o

author David Durant,2014/11/05(First edition:2011/02/17)Original link:http://www.sqlservercentral.com/articles/Stairway+Series/72284/The seriesThis article is part of the "Stairway Series:Steps forSQL 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, indexes are often added as an afterthought. The end here is a simpl

different types of indexes, all of these indexes use this balanced tree method in some way. In fact, because of the flexible nature of the balance tree, all indexes are structurally similar, but they actually have a little bit of a difference, and these differences can have an impact on the performance of the system.　　3. How data is accessed in SQL ServerBroadly speaking, there are only two ways for SQL

which some statements in SQL Server take advantage of the index may not be clear, our next analysis of this piece, to understand the indexing method and optimization techniques, interested in advance attention, about SQL Server performance

. server.2005. Technical Insider "series Conclusion This article first to this bar, short, easy to understand, this article mainly introduces the query plan of the joint operators, the next we analyze SQL Server parallel operations, in multicore hyper-threading gathered today, see SQL How

In database principles, clustering indexes are interpreted as follows: the order of clustering indexes is the physical storage order of data, while the non-clustering indexes are interpreted as follows: the index order is irrelevant to the physical data arrangement order. Because of this, a table can have at most one clustered index. However, this definition is too abstract. In

in each record to go to B scan again, actually swept the number of rows equal to a result set row x B result set row number. So if the two result sets are large, the result of the join IS bad.SQL Server 2005 Added merge Join, if the Join field of table A and table B is exactly the field of the clustered index, then the order of the table is lined up, as long as the two sides of the row, the cost of this Jo

Tags: date sample Ros Border tables Many column answer structuresThis 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, indexes are often added as an afterthought. The end here is a simple series of articles that shou

easily believe that the online spread of those "SQL optimization gold sentence", "SQL Optimization prescriptions", their practice several times, is the hard truth. First figure out the goal of performance tuning From the most intuitive, most common point of view, mainly includes the following two points: Optimize response time What is "Optimizing response time"

index is created based on the data that already exists, such as the need to alter INDEX to rebuild the indexes and reset the previously specified filefactor values.When you create an index, if you do not specify Filefactor, the default value of 0 is filled, and the global instance can be configured by sp_configure. Filefactor is also used only on leaf-level pagi

not regular, it is time-consuming to index the above, so the efficiency is lower than using the self-increment field.3, CombGiven the pros and cons of the two primary key types above, the comb type can be used to find a balance for both. Its design idea is this: since the GUID type has no regularity can be made index inefficient, affecting the performance of the system, then can not be combined to preserve

Original article address: StairwaytoSQLServerIndexes: Level1, IntroductiontoIndexes this article is part of the advanced series of SQL Server indexes (StairwaytoSQLServerIndexes. Indexes are designed for databases. Original article address: StairwaytoSQLServerIndexes: Level1, IntroductiontoIndexes this article is part of the advanced series of SQL

see the SQL Server will not dynamically split the task into a few other busy threads. We are here to add a large data scale, the script is as follows SELECT [Key],[data],[pad] into BigTable2 from BigTable Let's write a query with a large number of statements, make it occupy a thread, and here we force the designation to run with only one thread SELECT MIN (b1.[ key]+b2.[ KEY]) from BigTable B1 cross JOIN

rows reserved data index_size unused TB_WCB 9439661 317208 kb 167168 KB 149872 KB 168 KB */ we found that the size before index compression was 329M. And after compression is 149M, the compression ratio is 45%. The effect is also very obvious. Summarize: Compression through tables and indexes. We can reduce the disk space occupied by the table, this is only part of it, and more importantly, reading the same amoun

Try this tool to configure yourself today. First, a database is established in the database, named TestDB, and a new SQL Server login name (TESTDB) is created and the default database TestDB TestDB is specified. And then it starts to be configured. The configuration process is referred to theaspnet_regsql.exe tool registration database , but when you select the server