Saturday, April 26, 2014

Deadlock Handling Techniques in Database

What are the Deadlock handling techniques in database?

A set of transactions are considered to be in a deadlock state, if the transactions are waiting for one another to release the data items needed for them that are held by others. In a deadlock state no transaction will proceed.
The deadlock can be handled by rolling back a transaction which would be chosen as the victim.

Deadlock can be handled in the following ways;

Deadlock Preventionthis concept ensures that the system never enters a deadlock state. It chooses the transaction which would probably cause the deadlock and rolls-back the transaction.

Deadlock Detectionthis identifies the deadlock if any happened and recovers the system from deadlock.

Deadlock Recovery - recovers the system from deadlock state. It chooses the identified transaction which caused the deadlock, and rolls-back it.

Related Links

Deadlock in database
Database management systems home page
Four  necessary conditions for deadlock to happen

How to handle deadlock in database management systems

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