query tuning in sql server

For accidental reasons, when the inner join table is required, the corresponding field must beCase Sensitive. By default, SQL Server databases are case-insensitive. How can this problem be solved? To achieve this, there must be at least three operation levels: 1.Database level: The entire databaseChar,Varchar,Text,Nchar,NvarcharAndNtextThe data is case sensitive. (For ease of description, the data types are

BuniessDateTime1 between ' 2016-6-21 ' and ' 2016-6-28 'There may be 10,000 data, then BUNIESSDATETIME2,BUNIESSSTATUS1, BUNIESSSTATUS2 filteringFinally, there is only one qualifying piece of data.The difference is that: at the beginning of the filter conditions, determine how many page queries to determine the initial criteria to meet the data, and then further filteringIf the data range that satisfies the query condition is determined relatively acc

For more information about SQL Server paging query stored procedures, see. For SQL Server paging query stored procedures, refer. The Code is as follows: Create procedure [dbo]. [up_Pager] @ Table varchar (2000), -- table name @ C

If the primary database fails, Microsoft's SQL Server may enthusiasts down. See how you can handle this event to find out how to repair the primary database with Enterprise Manager and Query Analyzer. As an administrator of Microsoft SQL Server, you must know how to fix a c

methods just one more column of Rewnumber? Of course not, look at the internal differences: On two SQL, add the following SQL separately, and use MS's include execution plan to facilitate viewing execution details: SET STATISTICS time on SQL to execute: SET STATISTICS time in go select top numcomimg.* from (select Row_number () over (orde

Recently and colleagues to deal with a small program, the data volume is not particularly large, a table of data records: 7000W records around, but from the change to execute a query, but found that the query is not fast, and the most obvious problem is cpu100%.SQL statements:Select from where LNG> and LNG and lat> and LatMax_lat;To find the problem, use the fol

1. The question The system has a module that needs to query the data in the Oracle database. It is now implemented by establishing a linked server. SQL Server access Oracle implementation can refer to this article http://www.cnblogs.com/gnielee/archive/2010/09/07/access-oracle-from-sqlserver.html The current

SQL server allows you to quickly query information about a table among multiple databases. This example describes how SQL server can quickly query information of a table among multiple databases. We will share this with you for yo

Label:SQL Server database paging query has been SQL Server's short board, Idle to do nothing, think of several methods, assuming that there is a table article, Field ID, year ... (other omitted), Data 53,210 (customer real data, amount of small), page 30 per page, query page 1500th (that is, 第45001-45030条 data), field

SQL Server converts query results to script sharing in Json format, serverjson Script source code: Copy codeThe Code is as follows:SET ANSI_NULLS ONGOSET QUOTED_IDENTIFIER ONGOCreate procedure [dbo]. [SerializeJSON] (@ ParameterSQL as varchar (MAX))ASBEGINDECLARE @ SQL NVARCHAR (MAX)DECLARE @ XMLString VARCHAR (MAX)DEC

implemented in a stored procedure, we use a undocument query hint directly on the statement, which causes the parallel cost threshold of the query to be reduced to 0, which forces the statement to go parallel and the statement execution time from 20 seconds to 5 seconds (note: Using the hash join hint is 7 seconds). The following is a simple example of the effect of using this hint, as shown in Listing 1 o

SQL Server query performance optimization and analysis of transactions and locks (1) Step 2: analyze the locking status using SQL statements. sys. in the sysprocesses view, find out the source of waiting for the initial lock of resources and the subsequent processes to be forced to stop. The following code is applicabl

Determine the installed SQL Server 2000 Database Components version Use isql, osql, or query analyzer to Perform one of the following queries on Database Engine instances. Select serverproperty ('productlevel ') SELECT @ VERSION Select serverproperty ('productversion ') Use the following table to determine your Database Components version.

the cold data should be only a cold database to initiate these 20 data requests. At this point the R table data needs to be compared, only part of the cold data.6. Nonlocality = Cold storage: When you query and use hot data, move hot data that is no longer used for a period of time to the cold storage.7. Cold storage = nonlocality: Query cold storage, the results of this

Tags: back top blog number expression ^c compare escape character directory quotesRead Catalogue Brief introduction First, the general search conditions used like Second, like special case: Search wildcard characters Back to top introductionLike in sql: Use a good fuzzy query directive in SQL Server