sra levels

The source of this article: http://www.cnblogs.com/wy123/p/7218316.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)The things in the database are four characteristics that have atomicity (atomicity), consistency (CONSISTEMCY), isolation (isolation), persistence (durability).In the implementation of the consistency and isolation of the four

In many cases, PHP files may encounter some very difficult-to-troubleshoot errors, such as output of large white pages. It is possible that the PHP error level shields some non-fatal errors, resulting in no error prompt. Therefore, understanding and familiarity with PHP error levels may become a new method for debugging errors.Php. by default, the PHP Error Reporting level is E_NOTICE, and E_ALL indicates reporting all non-fatal errors, because these

Differences between the levels of integrated wiring systems In general, the levels of Integrated cabling systems are divided into three types: integrated, enhanced, and basic. So what are the differences between the three types? Level 1: Comprehensive The integrated architecture is suitable for scenarios with high configuration standards in the Integrated Wiring System. It uses optical fiber cables and co

[Switch] from the perspective of the framework, five levels of PHP and their respective salary and treatment, five types of salary. [Switch] looking at the five levels of PHP and their respective salary and treatment from the framework, I accidentally saw this article and was somewhat touched. I started my blog and used it to motivate myself. In the original article, [transfer] The framework shows the five

The chrome version of Angry Birds has been upgraded! This new version of 1.2.0 adds checkpoints designed for Christmas and the highly destructive mighty eagle on the iOS platform. Including: For 42 levels, you can use mighty eagle to play the game again. You need to pay $0.99. There are 25 season's greedings levels, and only one level can be played every day until the last level is displayed on Jan

SQL server lock mechanism (I)-Overview (lock types and ranges) SQL SERVER lock mechanism (II)-Overview (Lock compatibility and lockable resources) This article introduces the locking mechanism of SQL SERVER (iii) -- Overview (lock and transaction isolation level) Vi. Impact of various transaction isolation levels Users who modify data will affect other users who read or modify the same data at the same time. That is, these users can access data con

During the interview, you may often ask "what do you want to do in the next five years ?", This may be a difficult question to answer. In China, the answer may generally be team leader, Manager, ect, specialist, etc. In China, you may think that manager will be the programmer's next goal, but abroad, managers and programmers may be two different branches. The superior ect or specialist is better than the manager, because these people have higher IQ requirements. There was such an article on the

Cocos2d-x 3.2 Monopoly game project development-Part 5 standalone game-levels choose ScrollView, monopoly Standalone Click MenuScene. cpp to call Director: getInstance ()-> pushScene (MapChooseScene: createScene ()); Go to the level selection interface. We use the ScrollView control to create this interface. Because the position of the scrollview is relatively random after being dragged, I think it is to drag it to the second image to display the

1. Runs 64-bit registers and is compatible with the armv7 architecture software. That is, it supports both 32bit and 64bit, aarch64 aarch32 2. the privilege and mode are separated, and armv7 is integrated. In armv8, there are pl3, PL1, pl0, and no pl2 in the security status, and the safe memory space can be accessed. In the unsafe state, there are pl2, PL1, pl0, and no pl3, and the safe memory space is not accessible. Each PL level determines a set of commands and registers. 3. Exception

sea of ridicule in front of the leadership, and dress yourself as a technical master. It is really difficult to introduce the confused office culture into the technical department! Level 10: I am a dumb or dumb. If I write a SELECT statement, I will say that I am proficient in oralce. If I don't even know a few registers, I will say that I understand Assembly. I suggest sending all the registers to Japan as IT industry workers, earning money from the Japanese is also a serious blow to the Ja

Introduction: This tutorial is mainly for beginners, and the author explains how to use channels to handle the color levels and sharpness of pictures through examples. A friend sent me a picture and asked me how to get the color levels back and do a little bit sharper. Open the picture a look, sure enough color level is very weak, the petals are not clear. But this kind of picture has the same feature: it

Staff often need to analyze and summarize large amounts of data stored in Excel to discover trends and implications of data. For example, in the Sales Performance table shown in Figure 1, how do you quickly show how each employee's sales compare in 1 ~ March? Figure 1 Sales Performance table The "Levels" feature of Microsoft Office Excel 2007 enables you to quickly understand the distribution trend of your sales data by taking advantage of co

transaction read data that was not committed by another transaction. (There is a lot of potential for concurrent processing of the system) 2. Non-repeatable reading Within the same transaction, when reading the same data multiple times, the data was found to have been modified by another committed transaction. (data that is read two times within a transaction is not the same.) ） 3. Phantom Reading A transaction executes a query based on the same query criteria, and the returned record contains

Label:Access levels Modifier Class Package Subclass World Public Y Y Y Y Protected Y Y Y N No modifier Y Y N N Private Y N N N The following table shows where the members of the Alpha class is visible for each of the access modifiers that can

that was just made. Now the line read by T2 is invalid. ) exp: Xiaoming's score was 89, and transaction a changed his score to 98, but transaction A was not yet committed. at the same time, transaction B is reading Xiaoming's score, reading to Xiaoming's score is 98. then, transaction A to the exception and rolled back the transaction. Xiaoming's score rolled back to 89. finally, transaction B reads the data for Xiaoming with a score of 98 as dirty data, and transaction B makes a dirty read

Based on dropdown. js, two levels of navigation menus with beautiful atmosphere are available: dropdown. js This article describes two levels of navigation menus Based on dropdown. js. Share it with you for your reference. The details are as follows: 1. Blue navigation menu The running effect is as follows: The Online Demo address is as follows: Http://demo.jb51.net/js/2015/js-dropdown-blue-style-nav-menu-

MySQL supports four transaction isolation levels and mysql supports four types of transactions. Test environment of this experiment: Windows 10 + MySQL5.6.36 + InnoDB I. Basic Elements of transactions (ACID) 　　1. Atomicity: All operations after the transaction starts, either completed or not done, cannot be stuck in the intermediate stage. If an error occurs during the transaction execution, it is rolled back to the state before the start of the tran

The " amp;" operator can be understood at three different levels. Operators can be understood at three different levels. Level 1 Understanding When the operands are boolean values, "" performs the Boolean AND (AND) operations on the two values. The Code is as follows: X = 0 y = 0 // returns true only when x and y are both 0. The priority of Relational operators is higher than that.Level 2 Understanding

transaction is part of the parent transaction and is submitted uniformly by the parent transaction. Now you can feel the "nesting", is that a little bit of meaning? These are the 7 levels of communication for a transaction, and in everyday applications, it can usually meet a variety of business needs, but in addition to the level of propagation, in the process of reading a database, if two transactions are executed concurrently, how is the data betwe

Article Title: describes four intrusion levels for Linux servers. 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. With the expansion of Linux enterprise applications, a large number of network servers use the Linux operating system. The security and performance of Linux servers have received increasing attention. H