7.1- What Is Exactly A Transaction In Transaction And Concurrency Control | DBMS course online
7.1- What Is Exactly A Transaction In Transaction And Concurrency Control | DBMS course online
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Transactions & Concurrency Control In DBMS | Serializability | Recoverability | recovery System | Time stamp
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Transaction is a logical unit of work that represents the real-world events. A transaction is also defined as any one execution of a user program in a Database Management System (DBMS). The transaction management is the ability of a database management system to manage the different transactions that occur within it. A DBMS has to interleave the actions of many transactions due to performance reasons. The interleaving is done in such a way that the result of the concurrent execution is equivalent to some serial execution of the same set of transactions.
Concurrency control is the activity of coordinating the actions of transactions that operate, simultaneously or in parallel to access the shared data. How the DBMS handles concurrent executions is an important aspect of transaction management. Other related issues are how the DBMS handles partial transactions, or transactions that are interrupted before successful completion. The DBMS makes it sure that the modifications done by such partial transactions are not seen by other transactions. Thus, transaction processing and concurrency control form important activities of any Database Management System (DBMS) and is the subject-matter
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