data structures

The current High-performance computing system (high-performance computing Systems, HPC systems) is designed to efficiently perform floating-point-intensive work by 1. HPC systems are primarily used for scientific simulations, which have features

First, basic knowledge This chapter briefly describes the internal mechanisms of some Zend engines, which are closely related to extensions and can help us write more efficient PHP code. Storage of 1.1 PHP variables 　　1.1.1 Zval Structure Zend

1. Do not turn off the power when reading and writing the hard drive When reading and writing a hard disk, the disc is in a high speed rotating state, if the power is forcibly turned off, it will cause the head and disc to rub violently, thus

So far, we've learned that when you change the direction of the screen, the activity will be destroyed and then rebuilt. Keep in mind that when an activity is rebuilt, its current information may disappear. When an activity is killed, one or two of

js|xml| access to Web applications is a sign of integration of multiple subsystems. SQL and XML are two of the most common mechanisms for exchanging data between such subsystems. In this article, Mark Kolb introduces the SQL and XML libraries that

The most recent week is busy, the main work is to do a call "Keyboard Wizard" things, simply put a lot of data into memory, the data for quick retrieval, and then find the input conditions to match the best 10 records and show. Specific and the

Issues such as coordination, asynchronous behavior, responsiveness, and scalability can be the focus of attention in concurrent space. These are some of the more esoteric topics that developers must consider when designing applications. However,

Js|servlet Java servlet Technology and JSP technology enable Java server-side technology, currently they control the entire server-side Java technology market, and gradually become the standard for building commercial Web applications. Java

Ajax| Program | design First, the main reason to use Ajax 1, through the appropriate AJAX application to achieve a better user experience; 2, some of the previous server burden to the client, to facilitate the client idle processing capacity to deal

If you make a general backup, on a daily basis (at least for the most frequent user profiles), you will help reduce the loss of the file and increase the level of resilience. The safest backup method is to record them in different media, such as

In order to handle exceptions at run time, the program logs a large amount of information. Wherever it is executed, the program must be able to identify which object will be freed if an exception is thrown here, and the program must know each entry

Sysinit is a common framework for calling sorting and executing mechanisms separately. FreeBSD is currently using it for dynamic initialization of the kernel. Sysinit makes the kernel or modules of the FreeBSD can be restructured, added, deleted,

The. NET Framework Garbage collection What is garbage collection? Garbage collection is a mechanism that enables a computer to detect when an object can no longer be accessed. It then automatically frees the memory that is used by the object (while

Specification | skill | design | data | database | Database design method, specification and skill (recommended) The process of database design Database technology is the most effective means of information resource management. Database design

Introduction: This article describes best practices for developing WEB 2.0 enterprise applications based on IBM Lotus Domino. These best practices cover the entire lifecycle of system development, including the system design phase, implementation

Pass descriptor and SENDMSG/RECVMSG functions through UNIX domain sockets In the front we introduced UNIX domain socket programming, and more importantly UNIX domain sockets can pass file descriptors between processes on the same host. Let's take

In many of the new enterprise system designs implemented with SQL Server, System architects need to make decisions that are critical to the positioning of data structures and management application logic. SQL Server has its own programming language (

Data structure This course As a subject, the data structure is the subject of the computer's operation and the relation between them and the operation of the programming problem of the numerical computation. The description problem is no longer a

At the headquarters of Palo Alto today, Facebook's design team shared their design ideas and how they designed products for 250 million of users. In particular, they highlighted the following points: To write code frequently (get your hands

Ordered prompts to force Oracle to join tables in the order in which they appear in the FROM clause. By ordered hints, you can avoid table connection evaluations during the CBO SQL parsing process, thus avoiding Oracle generating incorrect