Live Lock in SQL

Question

What is Live Lock in SQL and how it is related to Deadlock.

Prabhu Raja · Answer

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Tulasi · Answer

Hi A livelock is one where a request for an exclusive lock is repeatedly denied because a series of overlapping shared locks keeps interfering . SQL Server detects the situation after four denials and refuses further shared locks . (A livelock also occurs when read transactions monopolize a table or page forcing a write transaction to wait indefinitely.) Please mark the answer as Accepted if it helps you.

Hemant Kumar · Answer

What is Live Lock? A Live lock is one where a request for exclusive lock is denied continuously because a series of overlapping shared locks keeps on interfering each other and to adapt from each other they keep on changing the status which further prevents them to complete the task. In SQL Server Live Lock occurs when read transactions are applied on table which prevents write transaction to wait indefinitely. This is different then deadlock as in deadlock both the processes wait on each other. A human example of live lock would be two people who meet face-to-face in a corridor and each moves aside to let the other pass but they end up moving from side to side without making any progress because they always move the same way at the same time and never cross each other. This is good example of live lock. refer this link http://social.msdn.microsoft.com/Forums/en/sqldatabaseengine/thread/478aa50f-b7dd-43fb-bb90-813057a6a1ed