high performance java persistence

get the maximum concurrency, but the management of the lock is very resource-intensive things (involving acquisition, inspection, release locks and other actions), Therefore, the database system needs to balance high concurrent response and system performance, thus creating the concept of "lock granularity". One way to increase the concurrency of shared resources is to make locked objects more selective. T

by the client is registered on the multiplexer, and the multiplexer polls to the connection with an I/O request to start a thread for processing.··Java AIO (nio.2): Asynchronous non-blocking, server implementation mode for a valid request for a thread, the client I/O requests are completed by the OS before notifying the server application to start the thread for processing,·BIO, NIO, AIO application scenario analysis:·The bio method is suitable for a

High-performance MySql evolution (1): Data Type optimizationThe database performance tuning process involves a lot of knowledge, including whether the attribute settings of fields are appropriate, whether the index is created properly, and whether the table structure is reasonable, are database/operating system settings correct ..... Each topic may be a field. In

Recently has been doing a new online business projects, in all the pre-design, medium-term writing and later on-line completion, open to the user when the use of the site to find that the speed is not as fast as you think! So after a lot of research and commissioning, finally the speed achieved our expectations.Here are some of the information I've collected over the one months and some of my own thoughts, and I'll do some more recording.A. From the browser to the server to initiate the request

cache the data to be processed, Kafka has better throughput, built-in sharding, replication, fault tolerance mechanism, is a better solution for large-scale data message processing.2, website activity tracking: Site visits, search volume, or other user activity behavior such as registration, recharge, payment, purchase and other behavior can be published to the center of the topic, each type can be as a topic, these information flow can be the consumer subscription real-time processing, Real-ti

Netty Combat high Performance distributed RPCCourse View Address: http://www.xuetuwuyou.com/course/171The course out of self-study, worry-free network: http://www.xuetuwuyou.comFirst, the software used in the courseNetty4.1.6.finalSpring Tool Suite 3.8.2.RELEASEMaven3.1Spring4Zookeeper3.4.6jdk1.8.0_111Ii. objectives of the course1, the use of fast learning Netty2, learn to build a

(Original)I bought the 2007.4 issue of programmer magazine yesterday and read it for the first time. One of the two high-performance I/O design patterns is eye-catching, this is a translation. I have been trying to carefully read this article for a long time. In this article, the I/O methods of the system can be divided into blocking, non-blocking synchronous and non-blocking asynchronous. Among the three m

Writing javascript events with high performance and efficiency How to make efficient web Front-end programs is a problem that I will not consciously consider every time I do front-end development. A few years ago, Yahoo's awesome front-end engineers published a book about improving the web Front-end performance, which caused a sensation in the entire web developm

This is a creation in Article, where the information may have evolved or changed. Original address: How to write High-performance code in Golang using Go-routines Original Author: Vignesh Sk From: Nuggets translation program Permanent link to this article: Github.com/xitu/gold-m ... Translator: Tmpbook Reviewer: altairlu How to write

simple string. A binding binds the "switch, routing key, message delivery queue" together to form a routing rule. Exchange type: Switch types: Fanout: Do not process routing keys and forward to all bound queues Direct: Processing routing keys must match exactly, that is, the routing key string is the same before forwarding Topic: The routing key pattern matches when the queue needs to be bound to a pattern. The symbol "#" matches one or more words, and the symbol "*" matches no more than a

the expired data again. We have a set in the cache, which contains the removed cache data signature, the corresponding data is written to a file on the disk.When a user requests data, first check whether the signature is in the normal cache. If not, check whether the signature is in the expired zone. If the signature is in the expired zone, if no disk file is read (at least the database overhead is reduced), check the database. 3. process the collection codeWhether it is page JavaScript or back

In High-performance I/O design, there are two well-known patterns reactor and Proactor modes, where the reactor mode is used to synchronize I/O, while Proactor is applied to asynchronous I/O operations. Before you compare these two patterns, we first understand a few concepts, what is blocking and non-blocking, what is synchronous and asynchronous, synchronous and asynchronous are for application and kerne

itself.2) Dubbox do not know how to asynchronous processing, I need to write the demo, currently not tested.9. Layering, separating, distributing1) I have done three types of project development, one is to build a lot of Java engineering, compiled into the Web project, not add a module to build a project, disadvantage if using a module is cumbersome.10. Asynchronously, using a queue, the request does not have to wait until the response can be returne

follows:# cp/usr/local/tomcat/webapps/root/web-inf/web.xml/web/webapps/web-inf/# Vim/web/webapps/web-inf/web.xml #添加下面这一行, in Add multicast routing addresses for each Tomcat node (two Tomcat hosts to configure):Route add-net 228.0.1.7 netmask 255.255.255.255 Dev eth0Restart the Tomcat service# Service Tomcat stop# service Tomcat startThe access tests are as follows:650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M00/88/75/wKiom1f4gY7jT5pZAAEW7R4l5fo298.gif "title=" Tomcathttp3.gif "alt="

I have studied json on my own today and it feels very useful. After testing, it is much faster than google's GSON. At the same time, Jackson can easily convert Java objects into json objects and xml documents, you can also convert json and xml into Java objects. Powerful functions! Everybody knows... syntaxHighlighter. all (); I have studied json on my own today and it feels very useful. After testing, it i

Java Hashcode method is contained in object, returns the value int, then calculates the index subscript of the hash table by Hashcode, the simplest is the remainder method, uses the hash table array length to hashcode, the remainder is the index subscript of the hash table. The cache typically holds data that is very high in reading and writing and has little change. The site's data usually follows the 28

DOM object. Memory cannot be deleted. The browser memory usage remains high. This memory usage will be automatically released as the browser refreshes.Another case is loop reference, where a DOM object and JS object are referenced to each other. In this case, the situation is more serious, and the memory will not decrease even if it is refreshed. This is strictly the memory leakage. --> The above is a summary of the implementation of

High-performance JavaScript data storage and javascript Data Storage 1. Four Basic Data Access Locations in JavaScript: literally, local variables, array elements, and object members. Generally speaking: [literal, local variable] running speed> [array, object member] 2. The internal attribute contains a set of objects in the scope created by a function. This set is called the scope chain. 3. Execute the fun

Label: style color use Java strong SP on size C ++???HP-socket is a set of common high-performance TCP/UDP Communication frameworks, including server components, client components, and Agent components. It is widely used in TCP/UDP communication systems in various application scenarios, provides C/C ++, C #, Delphi, E (easy language),

In the previous article, there are many performance and memory tips that need to be noted in the development of Android apps. This article is an analysis of performance optimization and memory optimization issues from the Smali instruction level.How to solve the problem of high interface start time overheadWhen we write Android applications, there are many situat