sql server cpu usage query

Label:Paging Query for sqlserver2005 SQLSERVER2005 has been using the top keyword to achieve paged query, but inefficient, in the sqlserver2005 and later versions of the use of row_number () parsing function to complete the paging query, the efficiency has been greatly improved, but the SQL statement is more complex, T

Copy codeThe Code is as follows: -- PK Select * from sys. key_constraints where object_id = OBJECT_ID ('tb ') -- FK Select * from sys. foreign_keys where parent_object_id = OBJECT_ID ('tb ') -- Create a linked server Exec sp_addrole server 'itsv', '', 'sqloledb', 'remote server name or IP address' Exec sp_add1_srvlogin 'itsv', 'false', null, 'username', 'Password

As a small program ape, in the daily development can not avoid to and where in and like to deal with, in most cases we pass the parameters of simple quotes, sensitive word escape directly after the SQL, execute the query, fix. If one day you inevitably need to improve SQL query performance, need a one-time where in hun

Wbk_goods_info where cop_g_no= ' 00078027 'There are only 1 records in the Wbk_goods_info table that meet this condition, and the entire data table has 100,000 records, so the selectivity of this query is 1/100000, which represents very high selectivity, so it is efficient to find data by index. Conversely, or your statement is as follows:Select * from Wbk_goods_info with (index (IDX_COP_G_NO)) where cop_g_no> ' 00018000 'At this time the matching

MSSQL uses the linked server when querying multiple databases. The following describes how to add the linked server. After adding the link server, you can query multiple databases on any server. Exec sp_droplinkedsrvlogin zyb, null -- delete ing (ing between recording and r

1. Start or stop the SQL Agent service in Query Analyzer Start Use master Go xp_cmdshell ' net start SQLServerAgent ' Stop it Use master Go xp_cmdshell ' net stop SQLServerAgent ' Change the startup of a service from manual to automatic start exec xp_cmdshell ' scm-action 7-service mssqlserver-svcstarttype 2 ' It is also possible to execute the contents of quotes directly with the command line. 2. Cause a

XML query in SQL Server: For XML specify Auto Objective In SQL Server, an XML query can specify Raw,auto,explicit,path. This article introduces some examples of XML queries that specify auto in

Often listen to the students of Oracle materialized view, one of the functions of materialized view is that you can implement query rewriting, it sounds like a tall feeling, SQL Server also has the function similar to Oracle materialized view, just called indexed view. To tell the truth, or materialized views sound more appropriate, compared to the normal view, m

In the previous article, wherein and like implementation of SQL Server parameterized query describes several Implementation Solutions for SQL Server parametric query of wherein. xml and Table value parameters are omitted. Here is

For a slow query, we usually need to know which steps are expensive first, and then try some improvement methods. In general, if you cannot solve the problem by improving the hardware performance or adjusting the OS or SQL server settings, the remaining options are usually the following:1. Add the index of the corresponding field for the "scan" operation.2. Somet

Query optimization on SQL statements. The foreground application works on the database server, and ultimately relies on the SQL statements in the application. According to incomplete statistics, SQL statements consume about 80% of the database server's resources. Therefore,

from ITSV. Database Name. dbo. Table Name -- Delete the linked server when it is no longer in useExec sp_dropserver 'itsv', 'droplogins' -- Connect to remote/LAN data (openrowset/openquery/opendatasource)-- 1. openrowset-- Query exampleSelect * from openrowset ('sqlodb', 'SQL Server name'; 'username'; 'Password', data

SQL Server multi-Table query optimization solution highlights, sqlserver The multi-Table query optimization solution of SQL Server is what we will introduce in this article. We provide the optimization solution and specific optimi

As a little programmer, it is inevitable to deal with where in and like in daily development, in most cases, the parameters we pass are not much simple, single quotation marks, sensitive characters escape, and then directly spelled into the SQL, execute the query, done. If one day you inevitably need to improve the SQL query