tuning sql server

"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:

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

decomposition, it seems necessary to sort out a directory ....SQL Server Tuning Series BasicsSQL Server Tuning Series Basics (Summary of common operators)SQL Server

Original: SQL Server Tuning Series Basics (Index operations Summary)ObjectivePrevious 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

Recently, the following project encountered an urgent problem, my old horse and young people to fight together. The problem is that many queries are incredibly slow when the pressure data is poured into the database. Said there must be some basic guidelines for performance issues. The order of performance problems tunning 1 Architecture design (software architecture and database design, poor design is almost fatal) 2 Code defects (90% of performance problems) 3 Add index (this is to be deter

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

attention, on the SQL Server performance tuning of the content is very broad, followed by the analysis in the article.If you have any questions, you can leave a message or private messages, and look forward to an in-depth study of your child's shoes with SQL Server. Learn t

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 the topic of this article.Technical preparatio

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 operator optimization techniques, the same emphasis on the master of basic knowledge.In this art

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 operator optimization techniques, the same emphasis on the master of basic knowledge.In th

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

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

ELSEStatement_end_offsetEND -Statement_start_offset)/ 2) fromSys.dm_exec_sql_text (sql_handle)) asQuery_text--, Plan_handle,db_name(qp.dbid), Qp.query_plan fromsys.dm_exec_query_stats Crossapply Sys.dm_exec_query_plan (plan_handle) QPORDER by(total_logical_reads+Total_logical_writes)/Execution_countDESC--indexes that have not been usedSELECTO.nameobject_name --Table name, I.name index_name--Index name, I.type_desc--whether the clustered index, S.user

server| optimization In the actual work, especially in the production environment, the optimization of SQL statements is very important, and it also plays a significant role in improving the performance of the database. We are always complaining about the performance of the machine, always complaining about the trivial issues of concurrent access, but if we are not optimizing a single

Label:SELECT Mig.index_group_handle, Mid.index_handle, CONVERT (Decimal (28,1), Migs.avg_total_user_cost * Migs.avg_user_impact * (Migs.user_seeks + Migs.user_scans) ) as Improvement_measure, ' CREATE index idx_ ' + object_name (object_id,database_id) + ' _missing_ ' + Replace (replace (replace (ISNULL (Mid.equality_columns, ') + ' _ ' + ISNULL (Mid.inequality_columns, '), ', ', ' _ '), ', '), ' [', ' '), '] ', ') + ' On [' + object_name (object_id,database_id) + '] (' + ISNULL (mid.equality_col

In our OLAP implementation, SQL is extremely complex and uses a lot of temporary tables. During the installation of tempdb, the local disk path for SQL Server installation is selected by default, and no disk array is used. When learning PostgreSQL, we found that many experts suggest placing the temporary tablespace on SSD or using RAID0 + 1 to increase the write

)) FROM Seq WHERE id Then we execute this stored procedure and insert the test data. SQL Server Management Studio records the operation time in the lower right corner of the output window. To be more intuitive, we manually wrote a statement that records the time, as shown below: DECLARE @ d datetimeSET @ d = getdate () print 'start to execute the stored procedure... 'exec pro_Count_Test; S

When it is determined that application performance problems can be attributed to one or several time-consuming statements, tuning these statements is the responsibility of the database administrator or database application developer. Statement tuning is one of the essential skills for dealing with databases.When you face a "problem" statement, how should you analyze its problem, and finally achieve the purp

I like to think of tools bundled with SQL Server as inverted pyramid type, tools for diagnosing and checking general problems at the top, finding and diagnosing problem-specific areas of the tool at the bottom. In addition to providing a convenient way to write SQL scripts, Query Analyzer is the resource you need to use when you need to address specific

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 to the subject of this article.Technical prepa