sql server query tuning advisor

Preface Indexes are one of the most important objects in relational databases. They can significantly reduce disk I/O and logical read consumption and improve the query performance of SELECT statements. However, it is a double-edged sword. Improper use affects performance: it requires additional space to store the index information and requires additional overhead to maintain index synchronization when data is updated. The index is like a directory in

Microsoft, 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

SQL Server Performance Tuning entry (graphic version) Step 1: capture sample data during business peaks(About 2 hours ). The tool used is the profiler that comes with sqlserver, also known as the event probe. For example, after entering, click the button on the leftmost side to create a new trail: DBO permission is required for logon, therefore, you can log on wi

Books Online logical operators and physical operator references Refer to the book SQL. server.2005. Technical Insider "series Conclusion This article mainly introduces some of the methods of index operation, mainly describes the way we usually apply when writing statements, and to cite a few examples, as a point, in fact, we usually write in the statement is nothing more than this article introdu

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 amount of data, just need to read less data pages,

Tags: des style blog http io ar color OS useObjectivePrevious articles we introduced how to view the query plan, the introduction of common operators, the way of parallel operations, interested can click to view.This article will analyze in SQL Server, how to use the first indexed items for query performance optimizati

compression is 167M, the size of the table after compression is only 40% of the original table, the effect is obvious, and because most of the table's fields are only IDs, the relative repetition value is not too much.However, we see that the size of the index varies substantially, so we continue to compress the index:5. Compression indexAlter index idx_tb_wcb_id on Tb_wcbrebuildwith (Data_compression=row)6, the comparison after the index compressionsp_spaceused ' ms_visit_qst_opt '/*name

Original: SQL Server Tuning Series Basics (Summary of common operators)ObjectiveIn the previous article we looked at how to view the query plan, this article will introduce the analysis techniques in the query plan we looked at, as well as several of our commonly used operat

Label:Original: SQL Server Tuning Series Basics (Summary of common operators)ObjectiveIn the previous article we looked at how to view the query plan, this article will introduce the analysis techniques in the query plan we looked at, as well as several of our commonly used

specify the type and index of locks used by the statement, but in general, the lock type and index chosen by the SQL Server optimizer are optimal under the current data volume and query conditions, and we may specify only in the present case, But data volumes and data distributions will change in the future. F You can select the lowest isolation level (uncommitt

--windows Machine NameSysprep.exe check general, and turn off the machine--Instance NameSELECT @ @SERVERNAME, serverproperty (' SERVERNAME ')If SERVERPROPERTY (' servername ') Begindeclare @server sysnameSet @server = @ @servernameexec sp_dropserver @server = @serverSet @server = Cast (serverproperty (' servername ') a

There should be different filegroups in the database before the partition table is created;Assuming the database name is Df17datapro, create the user table UserID, put the first 500,000 data in the primary filegroup, place the 50~100 in the FG1 filegroup, and put more than 100 in the FG2 filegroup1. Add File group Fg1,fg2ALTER DATABASE Df17datapro ADD FILEGROUP FG1ALTER DATABASE df17dataproadd FILEGROUP fg22. Adding files to a filegroupALTER TABLEDf17dataproADD FILE(NAME=Df17datapro1,filename=

"SQL Server 2005 Deadlock resolution Discovery" mentioned a while ago, serious deadlock, the average occurrence of a deadlock every day, in the resolution and processing of SQL server2005 deadlock in the search for a lot of information and think of a lot of ways, on why deadlocks and how less deadlock has a further understanding, Here to share with you:

Original: SQL Server Tuning Series basics (Parallel operations Summary chapter II)ObjectiveIn the previous article we described how to view the parallel running of a query plan.In this article we then analyze the parallel operations of SQL Server.Gossip less, directly into t

. Experiments have found that different indexes can be created on the master/slave database without interfering with each other (this is related to replication configuration). This makes it possible to create more optimized indexes based on the different usage patterns of the master and from the database. I saw on a foreign blog that using the dynamic view of SQL Server 2005, indexes are automatic

ObjectiveAn index is one of the most important objects in a relational database and can significantly reduce the consumption of disk I/O and logical reads to improve the lookup performance of a SELECT statement. But it is a double-edged sword, and improper use can affect performance: He needs extra controls to hold the index information, and when the data is updated, it takes some extra overhead to keep the index synchronized.Image of the index is like a dictionary directory, you want to find a

Label:Original: SQL Server Tuning Series Basics (Union operator summary)ObjectiveIn the last two articles, we describe how to view the query plan, and some of the common optimization techniques for join operators, and we summarize how the federated operators are used and how to optimize them.Talk less and go straight t

Yesterday's SQL Server query performance optimization-index creation principle (I) mainly introduced the principle. today are some of the main principles and checks the created indexes. Iii. indexing principles In general, building indexes depends on the data usage scenarios. In other words, which SQL statements are co

poorly run applications outweigh the investment in human, program, and technology using reliable load testing methods. Therefore, I would like to provide the following list of load tests for your application, which will be a magic bullet to prevent your SQL Server performance tuning problem. Checklist: Load test--sql

more than 95% of the total SP cost. If we fix this insert into # temptable statement, the cost of the entire SP will naturally come down. Therefore, we need to insert this sentence. But it's slow! In the case of default, SQL Server results only displays a few characters. The SQL statement in the second line is incomplete, so we need to modify the settings. In th