high performance java persistence

In-depth Java Program Performance tuning (Amdahl law, cache component, parallel development, thread pool, JVM tuning)Course Lecturer: SpecialCourse Category: Java coreSuitable for people: BeginnerNumber of lessons: 33 hoursUpdate level: CompleteUsing technology: Amdahl Law, caching components, parallel development, thread pooling, JVM tuningProjects involved: the

session data based on the ID. Since PHP cannot maintain state during execution (different from Java), the session data needs to be stored somewhere, usually in the database. However, if a complex page needs to be searched ten times during each page loading process (this is often done), it means that each page needs to perform ten SQL queries, this will cause a large load on the database. In the preceding example of 0.01% Internet users in China, it m

In the company, have seen many different types of websites and systems, there are good and bad. Some of these systems have a good server/network architecture, and are properly tuned and monitored, while general systems have security and performance problems that do not work well and become more prevalent.In China, the open source lamp stack is the most popular network architecture, which uses PHP development, runs on Apache servers, and MySQL as a dat

comparison of Hubble+sqlserver, Hubble+mongodb and lucene.net in high concurrency of stand-alone systems.Test method:Through the test code query 10 times per second, query 840 commonly used English words search, return to the first 10 title and content, sorted by matching degreeTest Case 1:In this test case, we de-hubbledotnet all the caches so that Hubbledotnet reads the index from the hard disk each time, and Lucene.Net is also set to read from the

High-performance MySQL Reading Notes-lock, transaction, isolation level1. Why should I lock the lock? Because the database needs to solve the concurrency control problem. At the same time point, multiple clients may operate on the same row of records in the table. For example, some clients may read this row of data and others may try to delete it. To ensure data consistency, the database must control such c

10 simple Java performance optimizations and java performance optimizations Recently, the word "full domain (Web Scale)" has become popular, and people are also scaling their application architecture to make their systems more "full domain ". But what exactly is a full domain? Or how to ensure full domains?Different as

In fact, this article similar version in 12 in the online everywhere appeared, also with the rise of HTML5, the new features of HTML is also much sought after developers, nature-related HTML5 high-performance animation and game related articles are endless, the author is also in contact with the relevant technology in 12, but the saying goes " Interlacing as Foster ", with the arrival of the large front-end

**32 priority, the lower the value, the higher the priority, the default priority is 1024.Persistence ofThe job and its status can be logged to the file via Binlog, and the previous job and status can be restored by reading Binlog the next time BEANSTALKD is started.Distributed fault toleranceDistributed design is similar to memcached, BEANSTALKD each server does not know each other's existence, is through the client to implement the distributed and a

. Configure appropriate database parameters5. Optimize Cache Django-redis6. Monitoring real-time performance Graphite 1. Configuration Management tool Ansible/salt2, the Process management tool system UPSTART/SYSTEMD, the third party's Daemontools/supervisord3. Script execution Code update process Fabric4, check if there is a single point of failure Chaos Monkey5. Cache: Prevents cache key from expiring and flooding into DB Django-newcacheCache s

MS, and then add reflow/repaint/compositing or skip frame is the norm.Fortunately, the standard and browser vendors have earlier supported the animated interface RAF (Requestanimationframe function) to handle animation frame callbacks. Solves the problem that the above Settimeout/setinterval Animation insufficiency.Reasons for poor DOM performanceThe browser performs several steps:Restyle/reflow/repaint Trigger conditions:After you know the above information, consider the following conditions:

Label:Summary: How to create a high-performance database connection pool framework, which can be optimized from the point of view, the number of connection pool optimization practices How to escort your system, the topic will take you into the connection pool of the world, for you one by one announced. He Tao The only product platform architect He Tao, currently serving in the Platform Architecture Departme

scripts, etc.) , which can greatly speed up user access and reduce data center load.(3) Reverse proxy:The reverse proxy server is located in the website room, the proxy Web server receives an HTTP request and forwards the request as shown in:The reverse proxy server has the following features:① Protect website Security: Any request from the Internet must go through a proxy server first;② accelerates Web requests by configuring caching: Reduces load pressure on real Web servers;③ load balancing:

; Accept to the new Socket, did not trigger the next time to accept; Read to the new Buffer, determine the length of the Payload message, the decision process is long; Read to the new buffer, found that the Payload has not been fully received, continue to Read, "may" cause a Buffer Copy; Payload received, the de-serialization turned into a recognizable Protocol Message, deserialization slow; The business Module handles the corresponding Protocol Message, and the processing pr

November 9, 2015 Google Open source of the artificial intelligence platform TensorFlow, but also become the 2015 's most popular open source projects. After 12 iterations from v0.1 to v0.12, Google released its version of TensorFlow 1.0 on February 15, 2017, and hosted the first TensorFlow Dev Summit conference in Mountain View, California, USA. TensorFlow 1.0 and Dev Summit (2017) Review Compared with previous versions, the features of TensorFlow 1.0 are mainly reflected in the following aspect

High-Performance File Cache key-value storage-Redis, key-valueredis1. High-Performance File Cache key-value storage-Memcached 2. ASP. NET HttpRuntime. Cache Usage Summary Note: The three blog posts can be read in combination for easy understanding and use. If you want to learn more, please refer to the blog posts in th

One, what RedisREmote DIctionary Server, or Redis, is a memcached-like key-value storage System. Compared to memcached, it supports a richer data structure, including string (string), list (linked list), set (set), Zset (sorted set-ordered set), and hash (hash type), and provides a data persistence mechanism, in some scenarios, You can completely use it as a non-relational database. It is a high-