sybase performance tuning tips

Transferred from: http://www.cnblogs.com/MR_ke/archive/2010/08/25/1807856.htmlSQL 2005 Performance TuningSQL Server runs for a period of time, and as data accumulates, SQL runs less efficiently, and in order to use business system normal actions, IT departments often need to spend a high price on SQL tuning experts to solve. In fact, tuning is not complex, mainly

15 useful MySQL/MariaDB performance tuning and Optimization Techniques MySQL is a powerful open-source Relational Database Management System (RDBMS ). It was released in 1995 (20 years ago ). It uses Structured Query Language (SQL), which may be the most popular choice in database content management. The latest MySQL version is 5.6.25, which was released on July 25, May 29, 2015. An interesting fact about M

MyBatisRemoving all the columns will make the optimizer unable to complete such optimizations as overwriting index scans, such as HibernateHowever, retrieving the query cache for all columns is more beneficial than multiple independent query caches that only get partial columnsEvery time I see a SELECT * Please wonder if you really need to take it all outDuplicate query for the same data: Please cache this data, for example, in the session.The simplest of three metrics to measure query overhead

described in the previous article, and the same bufferedwrtier and bufferedreader efficiency is also very high. The buffer is used preferentially. Using static methods: Static methods can be used directly without building an instance, and because the method area GC is rarely recycled, and the JVM caches commonly used classes, some common tool classes are more likely to encapsulate static performance. And it is more expressive than function overlo

you want to port it to Android, do not use native code to improve the speed of code written by the Java language.If you need to use local code, you should read the JNI Tips. TIP: information can also be viewed in effective Java, 54th of Josh Bloch. Performance MythsIn a device that does not have a JIT, it is true that calling a method through a specific type of variable is more efficient than

"Performance Tuning" Oracle AWR reporting metrics full resolution What is AWR? ===================================================================================================== AWR (Automatic workload Repository) A bunch of historical energy data, placed on the Sysaux table space, AWR and Sysaux are all 10g, are the key features of Oracle tuning; About

plan directives are "extra tips" that prevent the optimizer from making the same mistakes in the future. In some scenarios, automatic re-optimization can also lead to the generation of SQL plan execution, but this does not include statistical feedback and performance feedback, but rather the execution of dynamic sampling to solve short-term deviations, therefore, no need for statistical information feedbac

SQL Server Performance Tuning entry (graphic version) Step 1: capture sample data during business peaks(About 2 hours ). The tool used is the profiler that comes with sqlserver, also known as the event probe. For example, after entering, click the button on the leftmost side to create a new trail: DBO permission is required for logon, therefore, you can log on with SA or use Windows integrated verification

Label:The story of Ash and awr 1.1 About Ash As we all know, when a user performs an operation in an Oracle database, it is necessary to create the appropriate connection and session, where all current session information is saved in the dynamic performance view v$session, where the DBA can see what the user is actually doing, or the current wait event. This part of the information is usually the key information in the

Tags: bottleneck affects LAN connectivity and so on addition query framework staticReprinted from Http://www.cnblogs.com/jiaosq/p/5843437.html Today, database operations are increasingly becoming a performance bottleneck for the entire application, which is especially noticeable for web applications. It's not just about the performance of the database that DBAs need to worry about, it's something that our p

xf master# cd major-mysqltuner-perl-993bc18/#./ mysqltuner.pl You will receive detailed reports and recommended tips for MySQL usage. The following is an example of the output from the default MariaDB installation: MySQL Performance Optimization 15. Optimize and Repair MySQL database Sometimes tables in the MYSQL/MARIADB database can easily crash, especially if the server shuts down unexpectedly, the fil

PHP is a scripting language executed on the server side that has developed many of the world's best-known websites, including Yahoo and Facebook. Here are 6 PHP code, performance tuning tips. 1. Upgrade PHP to the latest version The easiest way to improve performance is to constantly upgrade and update the PHP versio

% When the full time began to implement the old generation of garbage collection (CMS), then there is still 10% of the space is 5500*10%=550 trillion, so even if xmn (that is, the young generation of 500 trillion) all the objects are moved to the old generation, 550 trillion of space is enough, so as long as the above formula is satisfied, There will be no promotionfailed at the time of garbage collection;SOFTREFLRUPOLICYMSPERMB This parameter I think it might be a bit of a use, the official exp

MySQL is a powerful open-source database. With more and more database-driven applications, people have been pushing MySQL to its limits. Here are 101 tips for adjusting and optimizing MySQL installation. Some of the techniques are specific to the installation environment, but these ideas are generic. I've divided them into several categories to help you master more of the tuning and optimization techniques

Label:MySQL is a powerful open-source database. With more and more database-driven applications, people have been pushing MySQL to its limits. Here are 101 tips for adjusting and optimizing MySQL installation. Some of the techniques are specific to the installation environment, but these ideas are generic. I've divided them into several categories to help you master more of the tuning and optimization techn

Tags: temp dispatch variable mysqld equals unnecessary configuration of extension testOriginal link: https://m.aliyun.com/bbs/read/300762.html MySQL is a powerful open-source database. With more and more database-driven applications, people have been pushing MySQL to its limits. Here are 101 tips for adjusting and optimizing MySQL installation. Some of the techniques are specific to the installation environment, but these ideas are generic. I've divid

Label: MySQL is a powerful open-source database. With more and more database-driven applications, people have been pushing MySQL to its limits. Here are 101 tips for adjusting and optimizing MySQL installation. Some of the techniques are specific to the installation environment, but these ideas are generic. I've divided them into several categories to help you master more of the tuning and optimization tech

MySQL is a powerful open-source database. With more and more database-driven applications, people have been pushing MySQL to its limits. Here are 101 tips for adjusting and optimizing MySQL installation. Some of the techniques are specific to the installation environment, but these ideas are generic. I've divided them into several categories to help you master more of the tuning and optimization techniques

the article you learn SQL language experience, or probation book feel, we will elect 3 readers to give "SQL optimization core ideas" 1, quickly actively participate in it! Event deadline: May 10, 2018 In the "async Community " Backstage reply " concern ", you can get free 2000 online video courses ; recommend friends follow the tips to get books link, free to get an asynchronous book. Come and join me!Sweep the QR code above, reply to the "Att

There are a number of articles on Windows 7, but most of them are about user interface changes, such as new taskbar, improved Start menu, larger preview thumbnails, and more. There are still a lot of new things in Windows 7, so let's change the subject today. 10 Very useful windows 7 tuning tips have you noticed that disk defragmentation has supported multiple drives for parallel processing? Also, do yo