CONCURRENCY Prepared by : Wigdan Nadeem 1 Introduction Theory of concurrency Models Key terms related to concurrency Concurrency areas Concurrency control Advantages and Disadvantages References 2 Concurrency is the ability of a database to allow multiple users to affect multiple transactions. This is one of the main properties that separate a database from other forms of data storage like spreadsheets. 3 Concurrency theory has been an active field of research
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A Sophomoric∗ Introduction to Shared-Memory Parallelism and Concurrency Dan Grossman Version of February 23‚ 2012 Contents 1 2 Meta-Introduction: An Instructor’s View of These Notes 1.1 Where This Material Fits in a Changing Curriculum . . 1.2 Six Theses On A Successful Approach to this Material 1.3 How to Use These Notes — And Improve Them . . . . 1.4 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Transactions 1. In this exercise‚ you will see how to rollback or commit transactions. By default PostgreSQL commits each SQL statement as soon as it is submitted. To prevent the transaction from committing immediately‚ you have to issue a command begin; to tell PostgreSQL to not commit immediately. You can issue any number of SQL statements after this‚ and then either commit; to commit the transaction‚ or rollback; to rollback the transaction. To see the effect‚ execute the following commands
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Concurrency Control in Database Systems Key Points The purpose of concurrency control is to ensure that one user’s work does not inappropriately influence another user’s work. In some cases‚ these measures ensure that a user gets the same result when processing with other users as that person would have received if processing alone. In other cases‚ it means that the user’s work is influenced by other users but in an anticipated way. When many transactions take place at the same time‚ they are
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Explain some cases in which you would perm-ban/temp-ban people: Spamming : Caps/random letters and more things that will heart some one’s feelings . 1st : warn ( name) disrespect staff . 2nd : /mute ( name) 5 minutes disrespect staff . 3rd : /mute ( name ) 10 minutes disrespect staff . 4th : /mute ( name ) 15 minutes disrespect staff . =============================================================================================================================================================================================
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responsible for concurrency control? How is this feature used to resolve conflicts? In the fields of computer science and information technology there are often transactions‚ operations or jobs that are executed to gather a result. In most cases these results come in bunches and many separate transactions may have to occur at the same time. The process of managing simultaneous execution of transactions while ensuring the serializability of transactions in a database is known as concurrency control. Concurrency
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Explain some cases in which you would perm-ban/temp-ban people? Hacking: What is hacking well Hacking is someone that uses any kind of client and gets an unfair advantage on a player. First off I would record the Hacker and once I get a lot of proof I would permanently ban the Hacker for 48Hours and upload it and then share it with the staff team.If I was a Helper I would record the hacker then once I get a lot of proof I would upload it and share it with a Moderator+. Advertising Other Servers
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Explain some cases in which you would perm-ban/temp-ban people: Spamming Chat - If a player is spamming the chat with the same message over and over again‚ this would be a warn for ’Spamming Chat’ and if the user was to carry on‚ this would result in a 5m mute for ’Spamming Chat’ etc. /warn {user} Spamming Chat /mute {user} 5m Spamming Chat Suspicious Links / IP-Loggers - If someone is posting a suspicious link that has nothing to do with OP-Craft and looks very suspicious‚ the user will be perm
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1. The Principle of Solar Energy 2. The Principle of Power Energy Saving by CESS 3. The Inside Circuit Diagram and Function of CESS 4. The Power Out-put formula by CESS 5. The Difference of Energy Saving Rate at a site by CESS 1. The Principle of Solar Energy 1) Light and the wavelength The world is filled with light. Because there are full of light in the world‚ you may well wonder at the beautiful colors of all creations. But there are two types of lights; the one is the light which we can
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Design concepts in architecture: the porosity paradigm Sotirios D. Kotsopoulos 129 Franklin Street‚ # 203‚ Cambridge‚ Massachusetts 02139‚ USA; e-mail: skots@alum.mit.edu Abstract: Presented is a paradigm of how a design concept can be converted into a system of production rules to generate designs. The rules are expressed by the means of shape grammar formalism. The paradigm demonstrates how porosity a concept transferred from biology‚ medicine and organic chemistry was implemented by architect
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