mysql query performance tuning

third-party applications running on Linux, there are many performance tuning techniques that can help you improve the performance of your Linux servers and lower your operating costs.14. Correct configuration of MySQLTo allocate more memory to MySQL, you can set the MySQL c

with version 3.23.52 and 4.0.3, you can use a new SQL command Show INNODB STATUS To read the output information of standard InnoDB Monitor to SQL client. This information is useful for performance tuning. 　 Another way to use InnoDB monitors is to have it continue to write information on the standard output of the service program mysqld. When the switch is turned on, the InnoDB monitors displays data ap

.InnoDB Buffer hit RatioInnodb_buffer_read_hits = (1-innodb_buffer_pool_reads/innodb_buffer_pool_read_requests) * 100%Mysql> Show status like ' innodb_buffer_pool_read% ';25.Query Cache Hit RateQuery_cache_hits = (Qcahce_hits/(qcache_hits + qcache_inserts)) * 100%;Mysql> Show status like ' qcache% ';26.Table Cache State AmountMysql> Show status like ' open% ';27.

The following articles mainly describe the ultimate SQL Performance tuning Technology of DB2, including the impact of pointers on the Performance of DB2 databases, DB2 performance tuning technology and a detailed description of more future

. For example, when an index is deleted, the execution Plan of the corresponding SQL Plan baseline is deleted, this will not help avoid performance degradation. I personally think this is a comprehensive choice of Oracle, and it is not a limitation of SQL Plan Management. The SQL Tuning function of the Oracle database can generate an SQL profile to help the optimizer generate a well-adjusted plan. However,

obtain more information in this regard. Therefore, starting with 2nd technologies that help precisely locate the fault area, we will discuss how to conduct more detailed analysis. When starting a new database performance tuning project, you must first find out which query has the lowest efficiency. In other words, determine the cause of the worst

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excerpt from: http://uule.iteye.com/blog/2114697Summary of JVM garbage collection and performance tuningSeveral strategies for tuning the JVMFirst, JVM memory model and garbage collection algorithm1. According to the Java Virtual Machine specification, theJVM divides the memory into: New (Young Generation) Tenured (old generation) Permanent generation (Perm) Where new and tenured belon

easily believe that the online spread of those "SQL optimization gold sentence", "SQL Optimization prescriptions", their practice several times, is the hard truth. First figure out the goal of performance tuning From the most intuitive, most common point of view, mainly includes the following two points: Optimize response time What is "Optimizing response time"? The popular point is that after

Most developers believe that performance optimization is a more complex issue and requires a lot of experience and knowledge. Yes, it is not wrong. Admittedly, it's not easy to optimize your application for the best performance, but that doesn't mean you can't do anything without getting the experience and knowledge. Here are a few easy to follow suggestions and best practices that can help you create a goo

in SSMS T-SQL Tools SQL Profiler Query Analyzer Database Engine Tuning Advisor Windows Event Viewer, primarily to view the following event logs Windows Application Log Windows system logs Windows security Log Windows System Monitor is able to track: SQL Server I/O SQL Server memory SQL Server user SQL Server lock Copy activity Activit

This document describes how to use SQL Plan Management to manage SQL Execution plans. SQL Plan management provides components for capturing, selecting, and evolving SQL Plan information to prevent performance degradation caused by sudden changes in the execution Plan of SQL statements. See http://blog.csdn.net/davidwang9527/article/details/18620953 FOR THE FIRST PART This article includes the following topics:3. Use SQL Plan Baseline with SQL

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 feel very superficial, Bo and not specialized, until now I find their interests, so I foun

Author: (US) Tony Andrews Translator: Chen Yong Yang Health Series name: Chapter Hua programmer library Publishing House: Machinery Industry Publishing House ISBN: 9787111425021 shelving time: -6-4 published on: July 4,: 16 webpage: 86 versions: 1-1 category: more about computers> DB2 SQL Performance Tuning tips computer books DB2 SQL Performance

Tags: non-homogeneous project distribution tuning hold writes merge partitions multiple timesReprinted from XiaoruiSome users (especially the external output) when using Maxcompute (original ODPs), due to the use of the product level and level of understanding of the level of implementation, resulting in the implementation of the task is too long, the occupation of more cluster resources, serious will lead to failure, not only need to invest support s

Although the WebLogic version has now been upgraded to 10.3 and is packaged as Oracle Funsion middleware 11g, the new data is relatively small, sharing a WebLogic Classic version 8.1 performance tuning article. --------------------------------------------------------------------------------------------------------------- ---- Any successful product in the market has good

, that is, the so-called "know each other, the victorious" principle.Purchase Address:http://www.china-pub.com/3501136Course Requirements 1. Have a strong interest in performance testing.2. Need a certain programming foundation, can read basic C language code can. But need to have certain self-study ability, this is the performance completes the performance test

, such as business logic, SQL optimization, algorithms and so onIn this example, the Linux kernel parameter adjustment, the network has more detailed parameters, please refer to:11 1In this test, the adjustment of the relevant one-piece is as follows:1, Resin to handle the adjustment of the service:Conf\resin.xml file parameter adjustment under Resin directoryfree-min>10m free -min>Specific adjustment methods, you can refer to the JVM performance

. MongosniffThis tool can monitor from the bottom to what commands are sent to MongoDB for execution, from which it can be analyzed: EXECUTE as root: $./mongosniff--source NET Lo It then monitors all packet requests to local mongodb with localhost listening on the default 27017 port.2.MongostatThis tool provides a quick view of the statistics field descriptions for a set of running MongoDB instances: Insert: Insertion amount per second Query