mysql performance tuning tools

Cache Size| Query_cache_type | On | cache type, determines what queries are cached| Query_cache_wlock_invalidate | OFF | when other clients are writing to the MyISAM table If the query cache is returned , the cache result, or wait for the write operation to complete the reread table to get results+------------------------------+---------+Mysql> show global Status Like "qcache%";+-------------------------+-------+| va

In addition to the integrated VISUALVM and Jconsole, the JDK itself provides performance tuning monitoring tools such as JPS, Jstack, Jmap, Jhat, and Jstat.In Java development, we sometimes encounter the following problems:OutOfMemoryError, Low memoryMemory leaksThread deadlockLock contention (lock contention)The Java process consumes too much CPU......These prob

large, you may need to add-j-xmx512m This parameter specifies the maximum heap memory, which is jhat-j-xmx512m-port9998/tmp/dump.dat. Then you can enter the host address in the browser: 9998 viewed:4. Jstat (JVM Statistical monitoring tool)Jstat [generaloption | outputoptions vmid[interval[s|ms] [count]]Vmid is the Java Virtual machine ID, which is generally the process ID on the Linux/unix system. Interval is the sampling time interval. Count is the number of samples. For example, the followin

make decisions about. This mechanism is the rule engine.650) this.width=650, "src="/images/upload/image/%e5%9b%be%e7%89%872%2824%29.png "title=" drools rule Workflow engine Full development tutorials (basic syntax, Performance tuning, common tools) "height=" 490 "width=" 629 "/>Ii. Outline of the courseModule1-drools IntroductionModule2-drools Rule languageModul

Article title: debugging tools for Tuning LINUX network performance. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. This article describes how to adjust the network performance of

limit.(iii) Accelerate the compilation of JSPThe first time you access the JSP, it will be converted into Java servlet source code, and then compiled into binary. In this process, we are able to control the compiler used. By default, Tomcat uses the same compiler that executes Javac on the command line. In fact, there are faster compilers, we can use these to improve the JSP compile speed.V. Monitoring of Tomcat servers1, Tomcat's own monitoring index ServeletStep one: Increase the user access

1. Introduction:Javamelody can monitor Java or Java EE application servers in a running environment. It is displayed as a graph: Java memory and Java CPU usage, number of user sessions, JDBC connections, and HTTP requests, SQL requests, JSP pages and Business interface methods (EJB3, Spring, Guice), average execution time, Error percentage, and so on. Charts can be viewed by day, week, month, year, or custom time period.2. Prepare:Download Javamelody-1.47.0.jar and Jrobin-1.5.9.1.jar, referenced

language (DSL) specifically written for rulesIn version 5.0, the introduction of important functional modules such as Drools Funsion/flowrule1.2, why should learn drools?The rule engine is the framework for organizing business logic. It allows developers to focus on what they are sure of, rather than making decisions on some low-level mechanisms.Often, business users are more comfortable with things that make them understood to be right, relative to things that are expressed in the form of If..

]: MySQL 08:32:38> change MASTER toMaster_host= ' 192.168.0.1 ',Master_user= ' Repl ',Master_password= ' PASSWORD ',Master_log_file= ' mysql-bin.000035 ',master_log_pos=399;After executing the change MASTER to command, you can start SLAVE with the following command:[email protected]: MySQL 08:33:49> START SLAVE;At this point, our Replication environment is built.

servers through data segmentation solves both write performance bottlenecks and, once again, the scalability of the entire database cluster. Whether it is through vertical slicing or horizontal slicing, the system is less likely to experience bottlenecks. Especially when we use the vertical and horizontal combination of the segmentation method, in theory will no longer encounter the expansion bottleneck. Excerpt from: "

Tags: MySQL performance tuning six InnoDB engine and MyISAM engine performanceThe choice of the two storage engines depends on the application characteristics of the project, and for the complex application system, it is possible to select a combination of various storage engines according to the actual situation. But this method is not recommended to be taken. M

MySQL performance tuning and Architecture Design-Chapter 1 Data splitting of scalability design and mysql Optimization Chapter 1 Data splitting for scalable design Preface The expansion implemented through the MySQL Replication function is always limited by the size of the d

] 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 specific format (such as data files generated

are some bugs, is not necessarily applicable to the core of the online system.3. DRBD Disk Network mirroring schemeAdvantage: Software is powerful, data is mirrored across physical hosts at the underlying fast device level, and different levels of synchronization can be configured according to performance and reliability requirements. IO operations are kept in order to meet the database's demanding data consistency.Disadvantage: Non-Distributed File

authorize other users with the permissions that they own, usually with the following: With GRANT option to achieve the purpose of authorization.9, we can grant all available permissions for a level to a user through the grant all statement:Grant all on TEST.T4 to ' ABC ';Note: The above five permissions: Table,column,routine the objects that are dependent upon authorization must be present, unlike database level, which can be authorized when the current database does not exist.4.2.4 access Cont

This article introduces 10 MySQL Performance tuning methods. each method is very detailed and practical. For more information, see MYSQL, which is the most popular WEB backend database. WEB development languages have developed rapidly recently. PHP, Ruby, Python, and Java have their own characteristics. although NOSQL

Search to achieve efficient full-text Search 15.5? High-performance computing of large data volumes using distributed parallel computing 15.6? Summary Chapter 2? MySQL Cluster 16.0? Introduction 16.1? MySQL Cluster Introduction 16.2? Create a MySQL Cluster Environment 16.3?

The following environments are representative of the general configuration and work environment of small and medium-sized enterprises. I hope this article will help you understand the MySQL database performance tuning method in Linux. 51CTO recommends the MySQL database getting started and proficient tutorial to you. H

Tags: mysql performance optimization tuning-primer.shTuning-primer.sh detects the current operation of MySQL, generates reports, and gives recommendations for optimization. Download and use:1.wget http://www.day32.com/MySQL/tuning