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In a large database, performance has become one of the focuses of attention. How to Make the efficient and effective operation of the database become an issue that must be considered by database administrators and developers. Performance is the measure of efficiency when one or more applications run in the same environment. Performance is usually expressed by res
select the crosstab (intersection table) as the underlying table, which is the table referenced by the other table. For example:The EMP table describes the intersection of the T1 table and the T2 table SELECT * from WHEREbetween . and=A.deptidwill be more efficient than the following SQL SELECT * from WHERE a.deptid=and A.empid= and Between2. connection order in the WHERE clauseSQL Server parses t
. In this month's column, I will talk about four technologies that can be used to improve the performance of SQL Server? Or improve the scalability of the application. I will carefully describe the use of left join and cross join and the retrieval of identity values. Remember, there is no magic solution at all. Adjusting your database and its query takes time and
Preface
Indexes are one of the most important objects in relational databases. They can significantly reduce disk I/O and logical read consumption and improve the query performance of SELECT statements. However, it is a double-edged sword. Improper use affects performance: it requires additional space to store the index information and requires additional overhead to maintain index synchronization when data
1. confirm that the latest patches for NT/2000 and SQL server have been installed. Needless to say, you should have installed them, but I think it is best to remind you here.
2. evaluate and select a network protocol that considers maximum security but does not affect functionality. Multi-Protocol is a wise choice, but it is sometimes not used in a heterogeneous environment.
3. Set strong passwords for "sa"
worry about it, of course, the above scenario is not completely covered, or at least to explain part. The results we got above look at the execution time, now let's look at the two query execution plans.0 ) from sys.tables as T; 0 ) from sys.tables as T;The above may not be accurate, but also related to hardware configuration, it is possible to coalesce poor performance and IsNull. There should be no big difference in
This article discusses how to improve the performance of SQL Server databases. BKJIA database channel recommends "getting started with SQL Server" to help you better understand SQL Server
, generally believed that the closer the data from the method efficiency higher.
With a careful use of cascading deletes and cascading updates, cascading deletes and cascading updates as new features of SQL SERVER 2000, are reserved in 2005 and should be available. I'm talking about caution here, because cascading deletions and cascading updates have broken through the traditional definition of foreign keys
Trojan code. Compare your product scripts with the default scripts for a newly installed system and save it conveniently.
15. Record all user access information. Make these settings from the Enterprise Manager or enter the following on the Query Analyzer by using SA login:
Xp_instance_regwrite n ' HKEY_LOCAL_MACHINE ', n ' software\ microsoft\mssqlserver\mssqlserver ', n ' AuditLevel ', REG_ dword,3
16. Overriding the application uses more user-defined storage and viewing processes so general
Many enterprises also use various versions of Windows 9x in various contexts, so in order to use SQL Server 2000 in these environments, we must first understand the performance and limitations of Windows 9x.
Client software
SQL Server 2000 client software is included with
Many of my friends may be making mistakes in performance optimization as described below. If you have any need, please refer to the mistakes in SQL Server query performance optimization to get out of the index.
Many of my friends may be making mistakes in performance optimiz
SQL Server Full-text indexing performance has been not too good, listen to colleagues today to share, found a skill, go back to try, found that can obviously improve the performance of full-text indexing, generally can improve twice times +
Original SQL statement:
SELECT
After a period of research, we started to optimize the performance this week. Before optimization, I will summarize some of the information I have investigated.
1. Background
This is a system developed in the past 03 years. NET 1.1 + SQL Server 2000, the operating system uses Windows2003. After so many years of use, the operating system was upgraded (from Windows
The source of this article: http://www.cnblogs.com/wy123/p/7106861.html(It is not the original works right to retain the source, I my book still far to reach, just to link to the original text, because the following may exist some errors to amend or supplement, without him)Recently encountered in SQL Server several times the developer submitted the performance pr
Extending a SQL Server environment across multiple systems can be said to be a difficult and complex project, involving partitioned databases, federation, and so on. So, when it comes to SQL Server scalability, most organizations prefer to take the approach of extending independent systems before trying to solve them.
Tags: blog http io os using AR java strong SPIndex of http://www.blogjava.net/allen-zhe/archive/2010/07/23/326966.html Performance optimizationRecent project needs, did a period of time SQL Server performance optimization, encountered some problems, but also accumulated some experience, now summed up, with June share.
the same, does not necessarily apply to the current query, the performance problem is generated.Why is the execution plan compiled with a completely inconsistent current, and the cache has not been cleaned up so far? There are two reasons for personal speculation, but it is not entirely certain thatOne is based on the current data distribution (statistical information) obtained by an implementation plan, it may be that the statistics are not accurate
Unlike other SQL Server databases, tempdb stops at SQL Server and automatically drops and re-create upon restart. by default, a new 8 MB (MDF file: 8 MB; LDF file: 1 MB, autogtouth is set to 10%) recovery model is a simple tempdb database.
After the tempdb database is created, DBA can create data objects, temporary
installed system and save it conveniently.
15. Record all user access information. Make these settings from the Enterprise Manager or enter the following on the Query Analyzer by using SA login:
Xp_instance_regwrite n ' HKEY_LOCAL_MACHINE ', n ' software\ microsoft\mssqlserver\mssqlserver ', n ' AuditLevel ', REG_ dword,3
16. Overriding the application uses more user-defined storage and viewing processes so general access to the table can be disabled. Here you should also see
rows reserved data index_size unused
TB_WCB 9439661 317208 kb 167168 KB 149872 KB 168 KB
*/ we found that the size before index compression was 329M. And after compression is 149M, the compression ratio is 45%. The effect is also very obvious. Summarize: Compression through tables and indexes. We can reduce the disk space occupied by the table, this is only part of it, and more importantly, reading the same amount of data, just need to read less data pages,
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