Issues in Concurrency Control
Concurrency control is the process of managing
simultaneous execution of transactions (such as queries, updates, inserts,
deletes and so on) in a multiprocessing database system without having them
interfere with one another.This property of DBMS allows many transactions to
access the same database at the same time without interfering with each other.
Problems of Concurrency
Control :
When concurrent
transactions are executed in an uncontrolled manner, several problems can
occur.
The concurrency control has the following three main problems:
The concurrency control has the following three main problems:
Lost updates.
Dirty read (or uncommitted data).
Unrepeatable read (or inconsistent
retrievals).
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