java performance tuning and optimization

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Title:java Program Performance Tuning notes (3)-tips to help improve performanceTags: tips to help improve performance grammar_cjkruby:true 1. Use exceptions with caution @Test public void Testinfortrycatch () {//performance difference long Starttime=system.currenttimemillis (); int a=0;

you to optimize the SQL statement for join. Also, the fields that are used for join should be of the same type. For example, if you want to join a DECIMAL field with an INT field, MySQL cannot use its index. For those string types, you also need to have the same character set. (The character set of two tables may be different) "Avoid select *" "always set an ID for each table" We should set an ID for each table in the database as its primary key, and the best one. "Use enum instead of VARCHA

Tags: base conferencing method technology and services COM CTF Research: Network Disk DownloadOracle Database 10g Performance Tuning and optimization provides a way to monitor, analyze, and optimize Oracle database 10g, built by Oracle Certified Master Richard J.niemiec. The book contains detailed case studies, best practices, and a rich code sample of Oracle's n

, Running-------------------+-----------------+-------+------------- +--------------------Maxscale> list SerUnknown or missing option for the list command. Valid Sub-commands is:Clients List all clientsDcbs List All DcbsFilters List All FiltersListeners List all listenersModules List all currently loaded modulesMonitors List all monitorsServices List all the servicesServers List all serversSessions List all sessionsThreads List Polling ThreadsCommands List Registered commandsMaxscale> quit 4 tes

garbage collection process are explained. The five articles will explain the principles of Java Program Performance tuning, especially the necessary knowledge in this process and the need to determine whether your program needs tuning. It also describes the problems you may encounter during

One of the practical skills that can greatly improve the performance of SQL TUNING optimization. When we perform SQL optimization, we often encounter the need to sort a large number of datasets and then retrieve the first part of the results from the sorted set. In this case, when we write SQL statements according to t

add the following line to the boot auto mount in the/etc/fstab file: /dev/sdb1/ssd ext3 defaults00 Now we move MySQL to the new diskFirst stop the MySQL service: #service mysqld stop I suggest you?? Stop Apache/nginx at the same time to prevent any attempts to write to the database: #service httpd stop #service nginx stop Now copy the entire MySQL directory into the new partition: #cp/var/lib/mysql/ssd/-Rp This may take some time, depe

Spark Source Analysis Reproduced: Http://blog.sina.com.cn/s/articlelist_2628346427_2_1.html Http://blog.sina.com.cn/s/blog_9ca9623b0102webd.html Spark Performance Optimization-------Development tuning reprint 2016-05-15 12:58:17 Development tuning, know spark basic development principles, including: RDD lineage design

number smaller than their own, the right to put bigger than their own dataFeatures: Fast Range search Speed3. Create an index:Normal index:CREATE INDEX name on ... Table of: ColumnCREATE INDEX Zhanggen on day61. ' User ' (email);Unique index:Create unique index index name on table name (column name)Drop unique index index name on table nameCombined index (leftmost prefix match):Create unique index index name on table name (column name, column name)Drop unique index index name on table nameCreat

Java program performance optimization and java Performance Optimization Java program tuning entry-level tutorials seem very thick. In fact,

Want to keep your project running at high performance? Here are some tips you can take to eliminate cache bottlenecks, as well as some other performance tuning recommendations.Most developers think that performance optimization is a complex topic that requires a lot of work

Tags: disco net text http speed data start time NTS database applicationOriginal: SQL Performance Detection Tool: SQL Server Profiler and Optimization tool: Database Engine Tuning Advisor I. Summary of TOOLS? database application system performance is low, it needs to be optimized,?? If you do not know where the proble

below: The total number of instances created on the left, the structure of the instance on the right, and the reference description below, which can be seen in the class Cyclicdependencies and referenced by HashMap.This can determine the location of the leak, and then according to the actual situation to analyze and solve. JVISUALVM remotely monitor Tomcat 1 and modify the remote Tomcat's catalina.sh profile, where it adds: java_opts="$JAVA

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

consumption. At the cost of a single performance loss, but because it reduces CPU consumption, for multi-threaded applications, it improves the overall average performance.(Similar scenarios in actual Java applications, where the best way to do this is to use the wait/notify mechanism instead)For other similar cycles too many times, regular, calculation and so o

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

Reference indicators for performance Execution time-from the time the code starts running to the end CPU time--the time that a function or thread consumes the CPU Memory allocation-a scenario in which a program consumes memory at run time Disk throughput--Describe the use of IO Network throughput--describe the use of the network Response time-The response time that the system makes to a user's behavior or time

Most developers take for granted that performance optimization is complex and requires a lot of experience and knowledge. Well, you can't say it's completely wrong. Optimizing your application for optimal performance is not an easy task. But that doesn't mean that if you don't have the knowledge, you can't do anything. Here are 11 easy-to-follow recommendations a

The author of this book is a leader in Java performance and Java HotSpot virtual machines, helping you to use modern soft practices to improve your practical life by summarizing energy, avoiding common mistakes, and tips and tricks.Using G1 to overcome the limitations of parallel, serial, and CMS garbage collectors learn about the various stages of G1 GC collecti