Transactions - Database Management System
Subject and UNIT: Database Management System: Unit III: Transactions
The consistency of the database is maintained with the help of isolation property(one of the property from ACID properties) of transaction.
Transactions - Database Management System
Subject and UNIT: Database Management System: Unit III: Transactions
In database management system there are data at various levels depending upon the data sizes.
Transactions - Database Management System
Subject and UNIT: Database Management System: Unit III: Transactions
The optimistic concurrency control algorithm is basically a validation based protocol.
Transactions - Database Management System
Subject and UNIT: Database Management System: Unit III: Transactions
The DBMS maintains multiple physical versions of single logical object in the database. When a transaction writes to an object, the database creates a new version of that object.
Transactions - Database Management System
Subject and UNIT: Database Management System: Unit III: Transactions
The time stamp ordering protocol is a scheme in which the order of transaction' is decided in advance based on their timestamps. Thus the schedules are serialized according to their timestamps.
Transactions - Database Management System
Subject and UNIT: Database Management System: Unit III: Transactions
The two phase locking is a protocol in which there are two phases: i) Growing phase (Locking phase),ii) Shrinking phase (Unlocking phase)
Transactions - Database Management System
Subject and UNIT: Database Management System: Unit III: Transactions
One of the method to ensure the isolation property in transactions is to require that data items be accessed in a mutually exclusive manner.
Transactions - Database Management System
Subject and UNIT: Database Management System: Unit III: Transactions
Concurrent execution of transactions over shared database creates several data integrity and consistency problems
Transactions - Database Management System
Subject and UNIT: Database Management System: Unit III: Transactions
One of the fundamental properties of a transaction is isolation.When several transactions execute concurrently in the database, however, the isolation property may no longer be preserved.
Transactions - Database Management System
Subject and UNIT: Database Management System: Unit III: Transactions
The COMMIT, ROLLBACK, and SAVEPOINT are collectively considered as Transaction Commands
Transactions - Database Management System
Subject and UNIT: Database Management System: Unit III: Transactions
When multiple transactions run concurrently, then it may lead to inconsistency of data (i.e. change in the resultant value of data from different transaction).
Transactions - Database Management System
Subject and UNIT: Database Management System: Unit III: Transactions
Schedule is an order of multiple transactions executing in concurrent environment.