index performance tuning in sql server

Trust a lot of friends, whether it is to do development, architecture, or DBA, are often heard that the word "tune". Speaking of "tune", may let a lot of technical staff heart surging, may also make a lot of people feel distressed. Of course, there are a lot of people are dismissive of this, because not everyone has access to the project is very large, and not everyone does the project is very high performance requirements. In the mainstream enterpri

, physical read 0 times, read 0 times, LOB logic read 0 times, lob physical read 0 times, lob read 0 times.Table ' TB '. Scan count 2, logical read 46 times, physical read 0 times, read 0 times, LOB logic read 0 times, lob physical read 0 times, lob read 0 times.SQL Server Execution Time:CPU time = 734 milliseconds, elapsed time = 769 milliseconds.(2012 rows affected)Table ' #t2___________000000000065 '. Scan count 1, logical read 1677 times, physical

What is database partition?Database partitioning is a type of horizontal table segmentation. This technology is provided by SQL Server 2005 Enterprise Edition and later SQL Server versions. This type of horizontal table segmentation is different from that in SQL

For systems running on-line, current database performance monitoring typically monitors the following points:(1) Whether there is obstruction (Blocking);(2) whether there is waiting (waiting), blocking is the lock (locks) waiting;(3) Whether the running time is too long (long running);(4) Whether there is a deadlock (Deadlock);Sys.dm_exec_query_stats and so on, and so on some statistical information, usually not as the real-time alarm content, but in

I. Preface Index plays an important role in database performance. The advantages and disadvantages of index design directly affect the efficiency of DB execution. Therefore, when performing DB tuning, some of them will start to process the index. SQL server also provides a good tool for Database Engine Tuning Advisor and provides some advice on index creation and

SQL Server Performance Bottleneck analysisFirst, memory bottleneck analysis--sqlserver:buffer ManagerSELECT TOP 312 * from Sys.dm_os_performance_counterswhere object_name = ' Sqlserver:buffer Manager ' ORDER by Counter_name1.Buffer Cache Hit Ratio average >=90%Buffers are buffer page pools that create data pages, which is typically the largest portion of the

Label:Original: SQL Server Automation Operations series-Monitoring Performance metrics script (Power Shell)Requirements DescriptionGenerally in the production environment, sometimes need to automatically detect the status of the indicator value, if there is an exception, need early warning, such as e-mail notification, this article is introduced if the power shel

Original address: http://www.sqlpassion.at/archive/2014/04/08/improving-query-performance-by-using-correct-search-arguments/ Today's article gives you a talk about a specific performance issue with indexing on SQL Server. Problem Look at the simple query statement below, you may have seen it hundreds of times

existing event classes are displayed on the right. For performance optimization, we do not need security review or session information. Click the delete button: Switch to the third tab page, and the data column here is enough by default. Of course, if you are not pleasing to the eye, you can delete the appname/NT username and so on. On the last tab page, we need to block the event ID generated by the system: Check the excluded System ID, for examp

ExecuteScalar method to retrieve a single value (for example, an ID number) from the database ). This operation requires less code than executing the operations required to generate a single value for the returned data using the ExecuteReader method.You only need to update the data using ExecuteNonQuery. Use ExecuteScalar to query a single value. Ii. SqlDataRead and Dataset SelectionSqldataread advantages: fast data reading. If you do not need to process the returned data in large quantities, w

A common performance counter for SQL Server servers, in this flag. Performance object Counter Description Processor %processor time%privileged time Recommended value: lasts less than 80Recommended value: lasts less than 10 System Processor Queue Length

= 'white'Indexes created on the following columns will be useful to the optimizer.Au_lnameAu_lname, au_fnameThe indexes created in the following columns will not play a good role in the optimizer.Au_addressAu_fname, au_lnameConsider using narrow indexes on one or two columns. Narrow indexes are more effective than multi-index and composite indexes. Use a narrow index on each pageThere will be more rows and fewer index levels (relative to Multiple indexes and composite indexes), which will promo

SQL Server query performance optimization analysis transactions and locks (2 ). Step 1: Execute Example 2 and Example 3 code in the query analyzer. (This is the example in the previous article SQLSERVER query performance optimization analysis transactions and locks (2) -- Example 2 6 is locked by 53

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

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

Label:Original: SQL Server performance Optimization (i)--IntroductionFirst, the reasons for performance optimization:It sounds a bit superfluous, but let's say it in detail:1, cost savings: Here the cost is not necessarily money, but basically can be disguised as saving money. Perf