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Tag Archives: DBMS-Transactions and Concurrency Control

 The transaction is a single logical unit that accesses and modifies the contents of the database.Transactions access date using read and write operations. Transaction is… Read More
Pre-requisites: Various types of Backup A database backup is a copy of storage that is stored on a server. Backup is used to prevent unexpected… Read More
Pre-requisites: Audit Trail In today’s world, data plays a vital role for any organization. Not just for the organization but also for customers. It becomes… Read More
Central Authentication Service is a single sign-on protocol that is developed to permit a user to have access to multiple applications using the same underlying… Read More
In the Multiversion timestamp ordering technique, for each transaction in the system, a unique timestamp is assigned before the start of the execution of the… Read More
The isolation levels in DBMS are used to maintain concurrent execution of transactions without facing interruption through problems like dirty read, phantom read, and non-repeatable… Read More
Commercial demands for ensuring smooth functionality and highly efficient run-time servers, make it highly prime for Database Designers to work out systems and code which… Read More
Prerequisite: Conflict Serializability, Precedence Graph Conflict Serializable Schedule: A schedule is called conflict serializable if it can be transformed into a serial schedule by swapping… Read More
Concurrency control means that multiple transactions can be executed at the same time and then the interleaved logs occur. But there may be changes in… Read More
States through which a transaction goes during its lifetime. These are the states which tell about the current state of the Transaction and also tell… Read More
Time Stamping Protocols: The timestamp protocols ensures that each transaction in the system has in advance a timestamp that has been associated with each transaction… Read More
Algorithm for Recovery and Isolation Exploiting Semantics (ARIES) is based on the Write Ahead Log (WAL) protocol. Every update operation writes a log record which… Read More
Concurrency control is provided in a database to: (i) enforce isolation among transactions. (ii) preserve database consistency through consistency preserving execution of transactions. (iii) resolve… Read More
When multiple transactions execute concurrently in an uncontrolled or unrestricted manner, then it might lead to several problems. These problems are commonly referred to as… Read More
Generally, there are 3 types of schedule based on recoverbility given as follows: Recoverable schedule: Transactions must be committed in order. Dirty Read problem and… Read More

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