exadata architecture

============= optimization of large-scale website Architecture =====================A small website, such as personal website, can use the simplest HTML static page to achieve, with some pictures to achieve beautification effect, all the pages are stored in a directory, such a site on the system architecture, performance requirements are very simple, with the Internet business is constantly enriched, Websit

EF architecture ~ Add bitwise operation aggregation methods for groups, ef Architecture Back to directory We know that the Group groupby in Linq can group one or more fields in the set and aggregate one of the attributes. However, Linq provides multiple aggregation methods, in the uncle permission system, the above aggregation is not enough because we needPerform bitwise aggregation on permission FieldsOr p

the authentication mechanism, so that the API should be usedYou do not need to specify a specific SASL mechanism. This API facilitates client and server applications so that applications can be based on the required security featuresSelect the mechanism you want to use, such as whether you are susceptible to passive dictionary attacks and whether you accept anonymous authentication. The Java SASL API also allows developers to create custom SASL mechanisms. The SASL mechanism can be installed us

laws)4 inconsistent data (such as the seller has changed the product attributes, but the buyer is not seen in real time, if you want to enforce the same will also bring other problems)Distributed Cache ArchitectureOne is that the JBoss cache represents the need to update the synchronization of the scheme, one is the memcached as the representative of the non-mutual communication scheme.AsynchronousThe main thing is to use Message Queuing, and anything that can be done late can be done late, usi

Tomcat-Orthodox Class Loader architecture, tomcat-loading Architecture Mainstream Java Web servers include tomcat, Jetty, WebLogic, WebSphere, etc. These servers all implement their own defined loaders (generally one or more ), because a fully functional server needs to solve the following problems: The Java class libraries used by two Web applications deployed on the same server can be isolated from each

OkHttp3.7.0 architecture and Principle Analysis, okhttp3.7.0 Architecture Final Summary Realcall.exe cute 1.dispatcher.exe cute 2. get... 3. finish the output queue to boost execution Realcall. enqueue = dispatcher. enqueue (Async) 1. get 2. Callback 3. finish the output queue to boost execution Interceptor Retryfollw Retry upon failure Redirect to directly initiate new requests (conditional permit, reus

Analysis of the core architecture of the jQuery Library and the simple implementation of common APIs, analysis of the jquery architecture API The following code only demonstrates the implementation principle of prototype inheritance in the jQuery Library and the simple implementation of its common functional modules, and does not involve excessive compatibility processing.// This is my $;(Function (window,

Build the MySQL MMM architecture from scratch and build the mysqlmmm Architecture The cloud platform is a good thing. A typical configuration of MySQL-mmm requires five machines, one as the mmm admin, two masters, and two slave servers. It is really not easy to find five machines at once, not to mention installing the same operating system. With cloud, we have a complete lab environment in just a few steps:

Introduction to MVC Architecture-serialization attribute and mvc Architecture serialization attribute Instance product based on asp.net mvc 5.0 framework, source code: http://www.jinhusns.com/Products/Download During design, if we can predict that some entities may add some attributes in subsequent R D (or secondary development), in order to quickly increase or decrease these attributes, provides a design

Reference https://www.zhihu.com/question/27785028/answer/48096396 The wiki is too scholarly. Http://www.ruanyifeng.com/blog/2011/09/restful.html Http://www.ruanyifeng.com/blog/2014/05/restful_api.html Summary 1. The full name is Resource representational State Transfer: In layman's terms, resources are transferred in a certain form in the network.Resource：资源，即数据（前面说过网络的核心）。比如 newsfeed，friends等；Representational：某种表现形式，比如用JSON，XML，JPEG等；State Transfer：状态变化。通过HTTP动词实现。2.

materials.Drying thin air film to eliminate the use of PVC raw materials, adhere to the use of non-odor environmental protection of new building thin cloth. Its weight per square meter does not exceed 3 kilograms, but can achieve a span of 120-150 meters, and is lightweight, high-strength, flexible structure, no bending, torsion and compression of the components, in the wind, anti-seismic, to prevent temperature deformation, settlement deformation and other aspects of the effect is significant.

discovered. The wrong state may spread, if you think that the thread is only doing operations that are irrelevant to the important state, make sure that the thread does not encounter unhandled exceptions. The latest UI front-end framework! Trial with prize! Code Generation Code generation has many functions. For example, we can use code generation to reduce the amount of writing our code, or we can use code generation to implement cross-section operations such as AOP. Generally, there are

to determine whether the user has logged on, it is unreasonable to use the user name in the clear code, if you change the username of an administrator, does the system assume that the Administrator has logged on to the system? The solution is to save an encrypted user name, but this is also insecure, because once the encryption method is not cracked, it will still generate a huge vulnerability, therefore, the user name and password can be stored in the cookie at the same time, that is to say, t

Why does the Asp.net three-tier architecture use the n-tier architecture? Because each layer can only change a small amountCodeIt can be used on different servers physically, because the layer does not know any other layer of the application.ProgramThere are usually three layers: The presentation layer, the business layer, and the data layer. The presentation layer is used to display user interfaces, and th

Pinot architecture introduction, pinot Architecture1. High Level Architecture1. Purpose: To provide analysis services for a given dataset2. Input data: Hadoop Kafka3. Indexing Technology: to provide fast queries, Pinot uses column-based storage and various indexing technologies (bitmap, inverted index) 2. Data Flow2.1 Hadoop (Historical)1. Input data: AVRO, CSV, JSON, etc;2. Processing Process: files on HDFS are converted into indexed segments throug

Rsync architecture and rsync Architecture 1.1 rsync server configuration 1.1.1 view the server rsync version 1.1.2 after the rsync program is installed by default, the main configuration file of rsync is not automatically created and needs to be created manually. The main configuration file is "/etc/rsyncd. conf, create the file and insert the following content: 1 # Rsync server 2 # create by zhurui 18:1

Android architecture and android Architecture The figure shows that android is divided into four layers, with linux as the core and dedicated Optimization for mobile phones, providing the most basic functions of the android operating system, android runtime and libraries. Dalvik Virtual Machine (similar to JVM) is specially optimized for the android operating system. The above is the application framewor

Android system architecture, android system architecture The Android system is divided into four layers: Linux kernel, Android core library, Android Runtime Environment (Android Runtime ), Application Framework and applications. Linux Kernel) Android's core system services depend on Linux 2.6, such as security, memory management, process management, network stack, and driver model.Linux Kernel is also an

Three, in-depth rddThe Rdd itself is an abstract class with many specific implementations of subclasses: The RDD will be calculated based on partition: The default partitioner is as follows: The documentation for Hashpartitioner is described below: Another common type of partitioner is Rangepartitioner: The RDD needs to consider the memory policy in the persistence: Spark offers many storagelevel to choose from: At the same time,

statement resource file, you can set the HTTP header Cache-control and expired properties, slow the presence of the browser1.3.1.3 Enable compression: Compression can have a certain amount of pressure on the server and the browser1.3.1.4 CSS on the top of the page, JS placed at the bottom of the page1.3.1.5 reduce cookie transmission, consider using a separate domain name for static resources1.3.2 CDN Acceleration1.3.3 Reverse Proxy1.3.4 Application Server Performance optimization1.3.4.1 Distri