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Designing an application system does not seem difficult, but it is not easy to optimize the system performance. In the development of tools, database design, should There are multiple options for application structure, query design, and interface selection, depending on the specific application requirements and the skills of the development team. This document uses SQL
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Recently, due to work needs, I hope to make a comprehensive summary of the considerations related to SQL Server database performance optimization. After searching online, I found manyArticleSome of them list hundreds of entries, but you can see that there are a lot of seemingly incorrect or outdated information (which may be applicable to versions earlier than
impossible to design a system completely according to the standardization. Unless the system is very small, it is necessary to add redundancy in a planned manner after the standardization design. Redundancy can be a redundant database, a redundant table, or a redundant field. redundancy at different granularities can play different roles. Redundancy can be increased for programming convenience or for performance improvement. From a
disperse the concurrency pressure of the large scale data, also can speed up the speed of special query, the redundant field can reduce the connection of database table effectively and improve the efficiency.3.Design of the primary keyThe primary key is necessary, and the primary key for SQL Server is a unique index, and in practice, we tend to choose the smallest key group to work as the primary key, so t
what you need to do, especially if you use a linked server (linked server) in your SQL statement, for example, I have encountered a SQL statement similar to the following, executed for 10 minutes 1:select * 2:from localtable 3:where Somecolumn 4: (SELECT COUNT (*) 5:from RemoteServer.SomeDB.dbo.SomeTable 6:wher
server| View | index | performance What is an indexed view? For many years, Microsoft®sql Server™ has been providing the ability to create virtual tables, called views. In the past, these views have two main uses: Provides a security mechanism for restricting users to a subset of data in one or more base tables.Provide
Tags: des style blog http ar io color using SPSQL Server Performance Counter schema Introduction to Windows Performance counters The operating system can use the Performance Monitor graphical tool to measure performance information for systems, applications, se
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
server| Data | database | performance | optimization Editor's note: Database performance optimization and database management system are closely related, different database management system in the specific operation of a very different. Following this newspaper in 2003, the 48th, 49 issue of "Sybase Database Performance
not very useful because the connection command is not included in the query, but this information is useful if the query contains one or more connections.The scan count value for a table outside a loop is 1, but for a table within a loop, its value is the number of cycles. As you can imagine, for a table within a loop, the smaller the value of its scanner, the less resources it uses, and the higher the performance of the query. Therefore, when adjust
SQL Server's common performance problems can be considered in three aspects: operating system and database configuration, table/index/storage settings, and SQL statements. For delivered systems, it is often difficult to optimize SQL statements due to actual conditions. This article summarizes the practical methods for
Label:Original: SQL Server Performance Tuning Training IntroductionHello everybody, this is the first blog post I wrote in the blogging park, and the reason I want to open this blog is a record of my interest in MS SQL Technology learning. As a computer professional graduates, their own grasp of the technology always
Designing an application system does not seem difficult, but it is not easy to optimize the system performance. There are multiple options in terms of development tools, database design, application structure, query design, and interface selection, depending on the specific application requirements and the skills of the development team. This article takes SQL Server
Label:As a DBA, troubleshooting SQL Server is one of our responsibilities, and a lot of people each month bring us a variety of performance issues that can't be explained but solved. I've heard many times that the performance problems of previous SQL
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
target_recovery_time = [number of seconds or minutes]As mentioned earlier, SQL Server analyzes the current system pressure and, when it considers that there is no need to checkpoint at this time, kills the process, thus preventing the disk subsystem from becoming worse. When checkpoint is throttled, it is recorded in the information of the Sleep_bpool_flush wait type.Under normal circumstances, this wait s
. For example, when multiple indexes are used, the SELECT query may run faster. However, the speed of DML (insert, update, and delete) operations will be significantly slowed down because more indexes must be maintained for each operation. Therefore, if your query mainly contains select statements, it is very helpful to use more indexes. If your applicationProgramTo perform many DML operations, it is necessary to control the number of created indexes. SQL
SQL Server performance optimization -- wait -- SLEEP_BPROOL_FLUSHPreface: There is a database for historical archiving (referred to as the historical database). After a certain amount of time, the data file has reached more than 700 GB, and it was decided that some data does not need to be retained, this part of data is truncate and more than 600 GB of space is a
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