high performance java persistence

main aspects:(1) programming methods and modelsA good design can improve the program performance, which is not only applicable to Java, but also any programming language. It makes full use of various resources, such as memory, CPU, high-speed cache, Object Buffer Pool, and multithreading, to design a high-

space (only hotspot VM) or local heap leakage over time is a very common problem; OOM errors are often observed after a period of time, the dynamic transfer of applications. The younggen and oldgen ratios do not match your application. The Java heap is too large on a 32-bit Vm, causing the local heap overflow, the specific manifestation is that OOM tries to link a new Java EE application, create a new

algorithms is very important for applications that apply business logic to transactional operations. In general, the requirements for applications will determine the priority of each performance. 2. How to improve Java Performance To improve Java performance, we generally c

Transferred from: http://blog.csdn.net/zhangzeyuaaa/article/details/44542161Java's approach to designing databases in high-concurrency high-load Web sites (Java tutorials, Java processes large amounts of data, Java high-load data)

[Forward] 9 misunderstandings about Java performance and the java paradox of forwarding Please indicate the source for reprinting. Thank you for your support! This article from the optimization code: http://www.uucode.net/201502/9%e4%b8%aa%e8%b0%ac%e8% AE %ba Java's performance is known as black magic. This is partly

)/current Bandwidth * 100The strategy for increasing network utilization is to use non-blocking network I/O instead of blocking network I/O, and to read as much data as possible for non-blocking network I/O when reading requests, as much as possible when writing requests.6. Disk I/O utilizationDisk I/O has a critical impact on performance for applications that frequently perform disk I/O, such as databases, logs, and so on.Linux disk I/O monitoring:Af

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 tuning. At the end of this article, I'll give you some advice on how to make better decisions when tuning

as transaction, persistence, security, etc. can be handled by the application container or server. Once development is complete, it can be easily deployed to the application server where the specification is implemented. As a commercial application system on the Web, the number of people visiting the network is numerous, in the case of extensive access, there will be contradictions between excessive resource requests and limited server resources (me

Java performance analysis tools, Part 1: Operating System Tools, java operating systemsIntroduction The premise of performance analysis is that the running status of the application and the running environment of the application are displayed more directly in a visual manner. How can we achieve this visual display? We

Writing high-quality code: 151 suggestions for improving Java programs (Chapter 1: common methods and guidelines for JAVA Development ___ recommendation 1 ~ 5), java151 The reasonable man adapts himself to the world; The unreasonable one persists in trying to adapt the world himself. People who understand the truth adapt themselves to the world; people who do not

One: CPU1. The user-state CPU is the percentage of the total CPU time that executes the application code. The system-State CPU is the percentage of the total CPU time that the application performs operating system calls. System-State CPU high means that shared resources are competing or there is a lot of interaction between I/O devices. One goal of improving application performance and scalability is to min

Read Catalogue Recommendation 1: Do not appear in constants and variables easily confusing letters Recommendation 2: Never let a constant degenerate into a variable Recommendation 3: The types of ternary operators must be consistent Recommendation 4: Avoid method overloads with variable-length parameters Recommendation 5: Do not allow null values and null values to threaten the variable length method The reasonable man adapts himself and the world; The unreasonable

Become a Java GC expert (5)-Java Performance Tuning principle, gc Tuning Not every program needs optimization. If the performance of a program is the same as expected, you don't have to put extra effort into improving its performance. However, after the program debugging is

Read Catalogue Recommendation 1: Do not appear in constants and variables easily confusing letters Recommendation 2: Never let a constant degenerate into a variable Recommendation 3: The types of ternary operators must be consistent Recommendation 4: Avoid method overloads with variable-length parameters Recommendation 5: Do not allow null values and null values to threaten the variable length method The reasonable man adapts himself and the world; The unreasonable

IntroductionThis article is the second article in the Java Performance Analysis tool series, the first article: Operating system Tools. In this article, you will learn more about Java applications and the JVM itself using built-in Java monitoring tools. There are many built-in tools in the JDK, including: Jcmd

stability. This will increase customer costs, so it is necessary to take time to develop reasonable Java EE middleware environment specifications. This work should be combined with the initial capacity planning iteration. 3. Excessive garbage collection on java virtual machines Are you familiar with the error message "java. lang. OutOfMemoryError? JVM memory spa

tests, only the models that support Java serialization are included. The following three diagrams show the results of this test.Figure 6. Serialization of output Time Figure 7. Serialization Input Time Figure 8. Serialization of document Size The dom4j shows the best serialization performance of the output (generating serialized format) and the input (rebuilding the document from the serialized format), wh

Download the High-imitation QQ source code (android front-end + JAVA background + spark A openfire (XMPP + open source code ); B. android front-end source code (similar to QQ's high UI ); C java background source code (HTML5 on the UI ); Dspark (for windows ); Get: do not enjoy the income of labor The system is mai

Author a ”+ “WHERE a.id = :id”); In these cases, you should use a simple ++ to connect your string. The Java compiler will optimize it and execute the connection during compilation. Therefore, when running, the Code only uses one character and does not need to be connected. 7. Use Basic Data Types whenever possible Another way to avoid overhead and improve application performance is to use raw data types i

consider the following four main areas: (1) Methods and modes of programming A good design can improve the performance of the program, not only for Java, but also for any programming language. Because it makes full use of various resources, such as memory, CPU, cache, object buffer pool and multithreading, so as to design high-