data structures

Data | Database attached A: Introduction to the transaction A transaction is a series of actions executed as a single logical unit, which means that the actions are either all successful or fail altogether. If the last action fails, the previous

What is redo Redo record transaction logs, divided into online and archived. For the purpose of recovery. For example, if the machine is out of power, then you need to go online redo logs to restore the system to the failure point after the reboot.

Procedures and processes: A program is an executable mirror of a series of code and data stored on a disk, and is a static entity; Process is an executing program, it is a dynamic entity, in addition to include instruction segments, data segments,

This article mainly introduced PHP 4 kinds of common operation way, this article explained the CGI, FastCGI, Apache2handler, CLI and so on 4 kinds of Operation Way, needs the friend may refer to under Sapi:server application Programming Interface

JSON (JavaScript Object notation) is a data interchange format, a JavaScript based data representation language that defines the basic data description format on the basis of the following two data structures: 1 A set containing name/value pairs; 2

web|xml| page Second, the definition of XMLXML is a condensed SGML that combines the richness of SGML with the ease of use of HTML in Web applications. XML retains the extensible functionality of SGML, which makes XML fundamentally different from

As SOA becomes the IT trend, more and more SOA projects are launched. Some projects have failed completely, and some projects have succeeded. How to learn the lessons of these failed projects and develop the vision and strategy you need to plan your

1. Although C + + is mainly a new language developed on the basis of C, she is not a substitute for C, it is not an upgrade of C, C + + and C are brotherly relations. No one is more advanced than the saying that the more important point is C and C +

Data | database What is a database transaction A database transaction is a series of actions performed as a single logical unit of work. The payment process includes at least the following database operations, assuming a single transaction for

The problem of Netfilter/iptables In Linux, it is easy to use the Netfilter/iptables framework to prohibit IP addresses: The code is as follows: $ sudo iptables-a input-s 1.1.1.1-p tcp-j DROP If you want to completely block an IP address segment,

Distributed data challenges Distributed databases that do not have a fixed connection to each other cannot provide any system-wide locking mechanism. In particular, there is no mechanism to prevent you from inserting two rows with the same primary

Ruby's block is one of its key features, using blocks to write concise and highly reusable algorithms. Even if it had no other use, it would at least weaken the people's attitude towards the cycle of awe. This concept is also known in other

Displacement Mapping (Shift map) Another application of Normal maps is displacement mapping, in which the increase in detail is no longer achieved through virtual illumination, but rather a real change in the vertices of the model. When using

iis| Server | performance Each of the following commandments will effectively affect the performance and scalability of your code. In other words, try not to follow the precepts as much as possible! Below, I'll explain how to break them to improve

　　GProf uses an unusually simple but very efficient way to optimize C + + + + + + programs and easily identify code that is worth optimizing. A simple case study will show how Gprof optimizes the actual application from 3 minutes of runtime to 5

As Ajax paradigms get more and more widely used, browser pages can keep the front-end user interface active (and therefore asynchronous in Ajax) while requesting data from the back server. However, problems can arise when both activities access the

The method recommended by Kmdkit is to write the assembly source program as a batch bat file, taking the Ring0.sys of heaven as an exampleSave the following code as a Ring0.bat ; @echo off; Goto make;>>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>

Although you can use PHP to create command-line scripts for tasks such as system management and traditional data processing, programming languages have a major impact on the performance of WEB applications. Each PHP application resides on the server

Xml 1. Data exchangeUsing XML to Exchange data between applications and companies is no secret and should be ranked first. So why is XML so important in this field? The reason is that XML uses elements and attributes to describe the data.

Queues are linear tables that allow only inserts at one end and deletions at the other end. is an advanced first-out linear table (FIFO). The one end allowed to be inserted is called a team tail, which allows the deletion of one end to be called the