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Address: http://www.cnblogs.com/ibook360/p/3159544.html 1. Background Many companies' platforms generate a large number of logs (generally stream data, such as search engine PVs and queries) every day. to process these logs, a specific log system is required. Generally, these systems must have the following features: (1) build bridges between application systems and analysis

completely lost. The system accountant calculates the location of the corrupted data, either by recovering the redundant metadata information, or by directly deleting files that are corrupted or damaged by the metadata information. Obviously, the larger the file system to be detected, the longer the detection process takes. For partitions with a size of dozens of G, it can take a long time to detect. As Linux starts to be used for more and more important applications in large servers, it is bec

systems are writable to everyone, so that users can use the write command to send information. although the write command is prone to security issues, most users think that it is very convenient to use the write command to obtain information from other users. Therefore, the system sets the terminal device access permission to be writable to all users. The/dev directory should be 755 access permission method and owned by root. The principle that all u

Article Title: teach you how to make three mainstream systems coexist. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Over the past two days, I have been exploring how to make the three systems coexist. on the Internet, it is

IntroductionCAP is the most discussed theory in distributed systems, especially distributed storage, "What is the cap theorem?" "Ranking FAQs in the Quora Distributed Systems category. Cap in the programmer also has a broader popularity, it is not only "C, A, p can not meet at the same time, up to 3 select 2", the following attempts to synthesize views from the development history, engineering practice and

Oracle Microsoft SQL server2005 Sybase Informix DB2 Ingers Microsoft Access Visual FoxPro MySQL OracleOracle is one of the earliest commercial relational database management systems. It is also a widely used and powerful database management system. As a general database management systemThe entire data management function is also a distributed database system that supports various distributed functions, especially Internet applicat

1. Self-increasing primary key The primary advantage of the Self-increasing primary key is performance. Early database systems often used some numbers, such as ID card numbers and company numbers, as the primary key of the database table. However, soon, you will find the disadvantages. For example, in the early Hospital Management System, the ID card number is used as the primary key of the patient table. However, first, not everyone has an ID c

Application maintenance is a meticulous task. In addition to requiring the technical staff to be rigorous and responsible, technical personnel are also required to have high processing capabilities and work experience in various emergencies. With the establishment of ICBC's two big data centers, ICBC's core business data is concentrated in the data center, the primary branches focus on the maintenance of peripheral systems, such as the business system

Due to hardware restrictions in embedded systems, the huge and bloated X Windows in Embedded Linux systems are not suitable. We need a high-performance, lightweight GUI system. Generally, the GUI suitable for Embedded Linux systems has the following features: 2. It is small in size and occupies less flash and ram. When installing the GUI system, you should be abl

rapid progress and is encouraged by his achievements. He shares this achievement with other students through the Internet and is mainly used in academic fields. Someone saw the software and started distributing it. Whenever a new problem occurs, someone will immediately find a solution and add it to it. Soon, Linux becomes an operating system. It is worth noting that Linux does not include the Unix source code. It was rewritten according to the Public POSIX standard. Linux uses a lot of GNU sof

operating system detection technology-Identity information is obtained using this technology in many test tools.Information. It is often achieved through the collection and analysis of binary files.-TCP segmentation (Standard/non-standard) response analysis relies on different operating systems to perform specific segmentationDifferent responses are differentiated. Popular tools include Savage's queso and Fyodor's NMAP.Most of the changes come from t

The main points of installing a dual operating system are: (1) disk planning, note that dual operating systems should be installed in different partitions, (2) for beginners, it is best to install from a low to a high version; (3) Boot.ini, Ntdetect and Mldr These three files are very important for the boot of the dual operating system, and a backup is usually available. If you want to install 3 or more systems