Plead paging management method to complete virtual memory

Pleading bits and pieces are built on the foundation of fundamental pagination bits and pieces. In order to support the function of virtual memory, pleading function and page replacement function are added. Pleading for paging is the most commonly used way to complete virtual memory. In pleading for paging bits and pieces, only a portion of the pages required later need to be loaded into memory

2022-06-01 Network Security 我要分享

Summary of common sense points about processes and threads

The difference and connection between process and program 1) process is a running movement of the program and its data on the computer, and it is a static concept. The running entity of the process is the program, and the process of separating the program has no meaning. From a static point of view, the process is composed of the program, data and process control block (PCB).

2022-06-01 Network Security 我要分享

Memory masking and memory communication

In the computer bits and pieces of the late memory masking, the main memory capacity is very small, although there is only one user program in the main memory, but the storage space can not hold the user process often occurs, this contradiction can be dealt with with masking techniques. The basic idea covered up is that you don't have to visit the program all the time when the program is running.

2022-06-01 Network Security 我要分享

A collection of docker bits and pieces of knowledge

Docker run-when rm exits the Docker container, the file system inside the default container is still retained to facilitate debugging and retain user data. However, for the foreground container, because it only runs for a short period of time during development and debugging, its user data and

2022-06-03 Servers 我要分享

Governance method of memory non-continuous allocation

Non-continuous allocation permits a program to be evacuated into non-adjacent memory partitions, which can be divided into paging storage governance methods and segmented storage governance methods according to the size of the partition. In the paging storage management method, it is divided into fundamental according to whether all the pages of the homework can be loaded into memory when running the homework.

2022-06-01 Network Security 我要分享

Governance method of memory continuation allocation

The continuation allocation method refers to the allocation of a continuous memory space to a user program. It mainly includes single continuous dispatch, fixed resolution assignment and static resolution assignment. Under this method, the single continuous continuous allocation memory is divided into the piecemeal area and the user area, which is only provided for the operation piecemeal application, and usually at the low address part.

2022-06-01 Network Security 我要分享

Output / input (Istroke O) equipment dispatch and reception

1. Equipment dispatching Overview equipment dispatching refers to the equipment required to be dispatched according to the user's Istroke O request. The general criterion of distribution is to give full play to the effectiveness of the use of equipment, to keep the equipment busy as much as possible, and to prevent the formation of process deadlocks because of unreasonable methods of distribution. In terms of the characteristics of the equipment, the following three applications are used.

2022-06-01 Network Security 我要分享

An example of Oracle 10.2.0.5 RMAN Migration and upgrade 11.2.0.4

1. Environmental introduction 1. Source database environment operating system version: OEL 5.4x64 database version: 10.2.0.5x64 database sid name: orclOracle 10g 10.2.0.5 (64bit) installation directory is as follows

2022-06-01 Database 我要分享

Nand flash Bad Block Management OOB,BBT,ECC

Nand flash Bad Block Management OOB,BBT,ECC0.NAND Operation Management NAND FLASH Management: take Samsung FLAHS as an example, a piece of Nand flash is a device (device), 1 (Device)

2022-06-03 Internet Technology 我要分享

Fragmentation and assembly of Datagram

1. IP Datagram format 2, MTUMTU (maximum transmission unit): the maximum length of the data field in the frame format. 3. Sharding 1) when the length of the sliced conditional Datagram exceeds the maximum transmission unit MTU allowed by the network, the overlong Datagram must be sliced before it can be transmitted on the network. two

2022-06-01 Network Security 我要分享

Database backup

[oracle@oracle01 ~] $[oracle@oracle01 ~] $rman target / Recovery Manager: Release 11.2.0.4.0-Product

2022-06-01 Database 我要分享

Typical dispensing algorithm for operating bits and pieces

There are many adjustment algorithms in the operation, some of which are practical for homework adjustment, some are practical for process adjustment, and some are both practical. Several commonly used dispensing algorithms are introduced below. First come, first serve (FCFS) dispensing algorithm FCFS dispensing algorithm is the most complex

2022-06-01 Network Security 我要分享

Page jitter (fluctuation) and task set (resident set)

One of the worst cases of page jitter (fluctuation) in the process of page replacement is that the page that has just been swapped out is immediately swapped into main memory, and the page that has just been swapped in is immediately swapped out of main memory. This frequent page tuning action is called tremor, or fluctuation. If a process takes more time to change pages than to perform

2022-06-01 Network Security 我要分享

Machine dispensing: the concept, opportunity, switching, process, methods and basic principles of dispensing

The concept of regulation 1. The basic concept of regulation in the fragmentation of multi-programming, the number of processes is often more than the number of disposal machines, so it is inevitable that the process competes for routing machines. The dispatch of the disposal machine is to stop the dispatch of the disposal machine, that is, to select a process from the parking queue according to a certain algorithm (fairness, efficiency).

2022-06-01 Network Security 我要分享

Oracle Cloud (DBaaS): Migrating Databases to Oracle Cloud Using RMAN Backup

Https://community.oracle.com/blogs/Sir.DBaaSJoelPerez/2017/09/25/oracle-cloud-dbaas-migrating-databa

2022-06-01 Database 我要分享

INNODB page node data storage mode, data link, deletion chain learning and experimental summary

Previous article: about MYSQL INNODB index page header Learning and Experimental Summary http://blog.itpub.net/7728585/viewspace-2063921/ about INNODB S

2022-06-01 Database 我要分享

Detection and removal of deadlock

Most of the deadlock prevention and prevention algorithms introduced later are to impose restrictions or stop detection when allocating capital to the process. If bits and pieces are not taken when allocating capital to the process, the tactics of deadlock detection should be provided. The capital allocation chart is a piecemeal deadlock, which can be depicted by the capital allocation chart. Figure 2-17

2022-06-01 Network Security 我要分享

What is the off-machine upgrade of Oracle database

In this issue, the editor will bring you about the off-machine upgrade of Oracle database. The article is rich in content and analyzed and described from a professional point of view. I hope you can get something after reading this article. Architecture introduction: source library: single instance ip:192.168.56

2022-05-31 Database 我要分享

The concept of deadlock and the cause of deadlock

The definition of deadlock in multi-program piecemeal, because of the concurrent implementation of multiple processes, improve the application rate of piecemeal capital and improve piecemeal disposal ability. However, the concurrent implementation of multiple processes also brings a new achievement-deadlock. The so-called deadlock refers to a deadlock formed by multiple processes competing for capital.

2022-06-01 Network Security 我要分享

Page allocation strategy: resident set size, opportunities to access the page, and where to transfer the page

Resident set size about paged virtual memory, in preparation for implementation, it is not necessary to be able to read all pages of a process to main memory, so the operation must decide to read several pages. That is to say, how much main memory space is allocated to a particular process, you need to consider the following points: allocate to a pass

2022-06-01 Network Security 我要分享