A few SQL Server paging stored procedure writing and performance comparisonsStored procedure 5 Kinds of pagination, the following code is from the forgotten when from someone else that CTRL + C, so just as a collection, hope the author see don't Spray me.------Create a Database tutorial data_test-----Create DATABASE Data_testGoUse Data_testGoCREATE TABLE Tb_testt
The impact of using SQL waits blocking on overall performance
SQL Server 2000 provides 76 wait types to provide waiting reports. SQL Server 2005 provides an extra 100 wait types to track application
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
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
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
" began, and then check the "suo", and then find the word "rope", according to its page, Turn to the page where the word is located. Of course this requires that 1. All Chinese characters in the Xinhua dictionary are arranged in phonetic alphabet order. 2. The Xinhua dictionary has a phonetic lookup appendix in front of it. Clustered index is also the reason, 1. There is a "phonetic" list of all the data, that is, the index. 2. All data is arranged sequentially on the hard disk according to this
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
20150500
Union All
Select [Commitid]
,[Authorid]
,[CreatedDate]
,[Createddatekey]
fromDb2.tdw.dbo.commits C with(NOLOCK)whereC.[Createddatekey] between 20150500 and 20150900
with Check OPTION;
GO 2, query performance test Test1, using the basic table test, cost:16s Select Count (0)
from dbo.commits_total C with (nolock)
whereDay (c.[ createddate])=1 Test2, using partitioned view test, cost=136s, with Test1 there is a sign
The first time the data is accessed is much slower than the next access, because it reads the data from the disk and writes it to the buffer;
Aggregate queries (Sum,count, etc.) and other queries that scan most tables or indexes require a lot of buffering and can adversely affect performance if it causes SQL Server to discard other data from the cache;
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
performance of the rapid decline.The original version is actually quite common, and performance is better than after the rewrite (in the case of a very long string). But there is also the problem that if the string is too long, the performance drops sharply.If there is really a string of more than 5W commas. This SQL
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
andselectmax(列)(@pageIndexint, --页索引@pageSizeint--页记录数)asbeginsetnocounton;declare @timediff datetimedeclare @sql nvarchar(500)select@timediff=Getdate()set@sql=‘select top ‘+str(@pageSize)+‘ * From tb_TestTable where(ID>(select max(id) From (select top ‘+str(@pageSize*@pageIndex)+‘ id From tb_TestTable order by ID) as TempTable)) order by ID‘execute(@sql)selectd
How do you improve the performance of your SQL Server database? The author thinks that we should follow the order from outside to inside to improve the running performance of the database. The following figure:
First layer: network environment.
To the enterprise to meet the database reflection speed is relatively s
Many times, the performance bottleneck of our server will be when querying the database, so it is very important to cache the database, then there is no way to implement the SQL Server database cache, when the data table is not updated, read from the cache, when there is an update, only read from the data table, The an
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.