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Dirty reads, Phantom reads, non-repeated reads, and loss of updates, lost

Dirty reads, Phantom reads, non-repeated reads, and loss of updates, lost The weather is rain on January 1, June 5, 2017. When I sorted out the previous learning notes two days ago, I found that the problems caused by transaction concurrency-dirty reads, Phantom reads, non-repeated reads, and lost updates were a bit vague, so I re-reviewed them again, now I will summarize some of my understandings as follow

MySQL (26): The isolation level of a transaction has a phantom read of the problem

Label:1. Phantom reading Phantom Reading (Phantom read), also known as virtual reading, refers to the number of data bars in a transaction within two queries, the Phantom reads and does not repeat some types, the same is in the two query process, the difference is that the Phantom

How to delete phantom Devices)

Devices that have been installed on a system but are not currently available are referred to as "Phantom devices". These devices are not usually displayed in the Device Manager, but can be madeTo be displayed as though they are attached. This allows device properties to be changed or devices to be uninstalled via device manger even though the device is not physically connected to the PC. To display phantom

What is a phantom virus?

Nat.exe is a program called "New Ghost virus" that can be used to achieve the illegal purpose of a virus, for example: 1, the operation can control some of the advertising program to achieve traffic profit; that is, the pop-up ad window that the user mentions 2, control the computer to become broiler, DDoS competitors or more sinister purposes. Phantom virus: Ghost Virus After a successful run, in the process, the system boot add-ins c

On the understanding of dirty reading, phantom reading and non-repetition reading

Generally we are familiar with the four kinds of isolation modes of business, from pine to strict in order:-READ UNCOMMITTED (READ UNCOMMITTED): Dirty reads, Phantom reads, non-repeatable reads may occur in this mode-read Committed (Read Committed): Phantom read, non-repeatable read in this mode-repeatable read (REPEATABLE Read) : Phantom read-serial (Serialize)

MySQL Phantom read

First of all, MySQL Phantom read is not "a transaction within two times the same operation actually got a different result", because it is not possible at the RR isolation level using the Read VIEW/MVCC, the definition of this magic is more suitable for oracle,oracle transaction isolation only two levels, RC and Serializable. And then there are a lot of people who argue that the non-repetition is for a record, and that the

Phantom OS: Operating System in the 21st century?

Phantom OS: Operating System in the 21st century? 2009.02.08 from: solidot Russian programmer Dmitry zavalishin is developing a new Virtual Machine (VM)-based operating system called phantom. The phantom operating system is very different from today's operating system. Its goal is eternal life, that is, shutting down the computer will not cause the program to dis

Daji phantom 4-GPS uses a 4g sim card to control the plane

I have always imagined that drones can fly farther and more stably, and can be achieved through 4G signals. Now DJI has helped us achieve this. It is indeed a great company:Features: Purpose: surveying and mapping, agriculture, inspection, plant protection, and building Measurement Precision: GPS/BeiDou/GLONASS 3 system, 6-frequency GPS, provides 2 cm-level positioning for Aircraft 4G networks supported One-controller multi-host (five aerial vehicles) When the base station's ne

Summer NOIP Final Exam "1"--phantom

PhantomTitle Name: Phantom? time limit: 1 seconds? Space limitations: The MiBTitle DescriptionOn an infinitely large chessboard, n * n pieces are arranged to form a square of n rows n columns. Chess pieces can be moved horizontally or vertically, moving over an adjacent piece, falling into the next free grid in the same direction, and removing the pieces that have been crossed. Now, we want to know if it's possible to pass several operations, leaving

And today we've perfected the Phantom effect.

Very early to do a "Lingbo micro-step" phantom effect, but there are many problems, such as: location is not accurate, need to set a lot of parameters beforehand, the camera's viewport clipping and position can not be updated dynamically, and the corresponding particle effects and other preset all with the main character matching good, today put these problems are modified, No matter where the character is in the screen, it can be very ideal to render

PS Synthetic Phantom Effect

PS Synthetic Phantom effect This PS tutorial introduced the special effects of the production method can be applied to any video, but the black and white color, fixed lenses and other scenes are particularly suitable for the scene, because the omission of the background processing and pixel processing problems. Figure 00 1. Create a document This tutorial is used by the singer MV. The video screenshots are a bit similar, but very diffe

New trends in web design! Have you ever heard of the Phantom button?

@ Chen Zimu transparent button, as the name suggests, that is, in the design of the button in the Web page, no longer design complex colors, styles and textures, but only the outline of the line frame, only the text to indicate the function, background, with the entire page/background of the design of a way. Foreign designers called "Ghost button" (Ghost Buttons), praised this kind of button permeability simple, fitting the overall style without losing charm, not attractive. The design of the bu

Phantom Blue e Mobile phone How to insert card/card charm Blue e mobile phone SIM card installation steps detailed

SIM (small card), you need to cut cards or to the business hall to replace the nano SIM card. Charm Blue E Install SIM card step: 1, first open the box, take out the Phantom Blue e mobile phone and SIM card accessories, as shown in the picture. 2, the use of the needle, and then a little hard, will be stuck needle inserted into the charm of the Blue e mobile phone card slot hole, and then pop-up card slot. Cancel the card

Beauty Mito Self-made phantom effect tutorial share

To the U.S. Mito software users to detailed analysis to share the illusion of self-made the effect of the tutorial. Tutorial Sharing: Effect Chart Comparison: 1, in the "Beauty Mito" software to open the picture, into the "Landscaping" menu of "pull the drawing pen", select "Auto-pull figure", with the drawing pen will be picked up the characters, click "Finish Pull", select the foreground as the material, back to the main page. 2, into the "jewelry-user-defined" catego

The Phantom of the Family MX3 custom call/SMS Ringtones Tutorial

Specific steps 1. The Phantom mobile phone can set the MP3 directly to the phone ringtones oh (the outside assumes that the good ringtone is "***_ring.mp3") 2. First prize our charm family mobile phone and computer connection, and then in the computer into the mobile directory to find "Ringtones" folder, and open it. 3. Now we put the bell in the computer and copy the ringtone into this folder. 4. Now we are in the main menu of the Phantom's

Database transaction isolation level-dirty read, phantom read, non-repeated read, transaction level

Database transaction isolation level-dirty read, phantom read, non-repeated read, transaction level I. database transaction isolation level There are four database transaction isolation levels, from low to high: Read uncommitted, Read committed, Repeatable read, Serializable, these four levels can solve dirty reads, non-repeated reads, and Phantom reads one by one. √: Possible occurrence ×: No

Database transaction isolation level and dirty read, phantom read, non-repeated read, transaction level

Database transaction isolation level and dirty read, phantom read, non-repeated read, transaction level I. database transaction isolation level There are four database transaction isolation levels, from low to high: Read uncommitted, Read committed, Repeatable read, Serializable, these four levels can solve dirty reads, non-repeated reads, and Phantom reads one by one. √: Possible occurrence ×: No

Analysis of the locking problem of SQL Server to prevent the range lock of Phantom read under Serializable isolation level

Tags: writing test table Ash works how much position dirty read res effect The source of this article: http://www.cnblogs.com/wy123/p/7501261.html(It is not the original works right to retain the source, I my book still far to reach, just to link to the original text, because the following may exist some errors to amend or supplement, without him) In the process of dealing with concurrent things, the database has different lock performance under different isolation levels, and under the non se

How much does the Phantom Pro 5 phone rabbit run?

The charm oil long-awaited new high-end flagship mobile phone---The Phantom Pro 5 finally officially released yesterday, as the charm of the new series of high-end smartphones, but also the first flagship mobile phone of the Phantom Pro Series, its performance is naturally also a fever level kerosene attention topic. In front of the author for you to introduce this charm family Pro 5 performance situation,

Understand database transaction ISOLATION level and dirty read, not repeatable read, Phantom read __ database

4 attributes of a database transaction:Atomicity (atomic): both succeed or fail;Consistency (consistency): After a transaction operation, the database is in the same state as the business rules; for example, after the A,b account transfers, the total amount remains unchanged;Isolation (Isolation): transactions in operations do not affect each other;Persistence (Durability): After a transaction is committed, it is persisted to the database. Dirty read, not repeatable read,

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