db2 performance tuning tips

] mysqldump [Options]--databases [options] DB1 [DB2 DB3] ... mysqldump [Options]--all-databases [options] 1 "MyISAM engine, can directly copy data sheet. 2 "mysqldump: Data export to SQL statement 3 "SELECT * FROM table1 to outfile '/tmp/table1.txt '; 4 "Recovery: Load Data infile '/tmp/table1.txt ' into table table1; 4,mysqlimport Mysqlimport [OPTIONS] Database textfile ... The Mysqlimport program is a tool program that will store text data in a

Label:20 Experience tuning MySQL performance optimizationPublished: February 15, 2012 published by: OurmysqlSource: Web Base is read: 3,354 kills 0 comments This article will introduce you to 20 MySQL performance optimization experience, these little experiences will help you better use MySQL for web development. Today, database operations are increasingly bec

database administrators to test to confirm the obvious functionality, but a second person should be scheduled to test. If you don't have a budget to ask a full-time or part-time tester, consider having the development team check in with each other. If you have a budget for testers, then let your team add load to the application. Streamline the load test process When an application is published as a product, identify some of the factors that work with system

22 criteria for performance tuning of large-scale and high-traffic Internet sites (zz)Reprint from http://icyriver.net /? P = 26. The author should be yahoo China's engineer. Among the six newly added rules, the flush head method is quite interesting. yahoo changed its own yapache, so it is better to do these things, several other rules I think are also summarized by the research efforts of this jj team. ya

Recent project adjustments mainly involve changes to the length of database fields. In DB2, the only way to modify the length of a char field seems to be to delete the table and recreate it. Therefore, the question of which varchar and Char are used has been a headache. I read some information from the Internet and give a reply to this complicated question: SQL Server Performance

Javascript's performance tuning point A, use caution to remember that the "eval" code is 100 times times slower than the "eval" code. The main reasons are: JavaScript code performs a "precompiled" operation before execution: first, it creates an active object in the current execution environment and sets those variables declared with Var to the properties of the active object, but at this point the variabl

The simplest and most effective--bufferpool A buffer pool is a storage area in memory that is used to temporarily read and change database pages (including table rows or index entries). The purpose of the buffer pool is to improve the performance of the database system. Accessing data from memory is much faster than accessing data from disk. As a result, the fewer times the database manager needs to read from or write to the disk, the better the

dynamic statement caching. If you need to use input variables in a complex query workload, consider using the REOPT (ALWAYS) BIND option. When the input DB2 Performance Tuning variable value is known, the reopt bind option delays statement compilation from PREPARE to OPEN or during execution. The variable value is passed to the SQL Compiler, so that the optimize

operations, although PHP file operation efficiency is not low;41, optimize the Select SQL statement, as far as possible, as little as possible to insert, update operation (on the update, I was a bad batch);42, as far as possible the use of PHP internal functions (but I have to find a php non-existent function, wasted can write a custom function of time, experience problem ah!);PS: Built-in functions are nearly an order of magnitude more efficient than user-defined functions.43, the loop inside

Hard Canton: "iOS Performance Tuning Series", the second, continuously updated, welcome attention.The first article introduces the static analysis of analyze to the app, can find out the memory leak problem in the application, for some memory leaks can not be solved by static analysis, it could be discovered by dynamic analysis, and the analysis is more targeted.From the beginning of this article, we introd

Hard Canton: "iOS Performance Tuning Series", the second, continuously updated, welcome attention.The first article introduces the static analysis of analyze to the app, can find out the memory leak problem in the application, for some memory leaks can not be solved by static analysis, it could be discovered by dynamic analysis, and the analysis is more targeted.From the beginning of this article, we introd

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

"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

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

more information: Open source distributed database middleware mycat:http://blog.oldboyedu.com/mysql-mycat/Mycat: Open Source distributed database middleware: http://www.csdn.net/article/2015-07-16/2825228 Mongodb I've heard about it a few years ago, just know it's a nosql database, knowing that the storage format is JSON and is a file database. MongoDB supports sharding: Concrete implementation: http://my.oschina.net/ydsakyclguozi/blog/268377 PostgreSQL