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What is mean live lock and deadlock? How to prevent it?A deadlock can occur when two or more processes that strive to acquire resources are not able to acquire them due to some of the following reasons:
- Two processes may be interdependent upon each other,
- If there are more than 2 processes, then if a graph is plotted, then there could be a cycle,
- A server maintains a graph. The processes acquiring the resources would intimate the server about their requirement. If the server detects an occurance of a deadlock, the user process is be terminated.
In a livelock, a request for an exclusive lock is denied repeatedly due to a series of overlapping shared locks that keep interfering.
An SQL Server detects this situation after four denials and then refuses further shared locks.
When a write transaction is forced to wait indefinitely due to read transactions that monopolize a table or a page then a live lock occurs
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