7.26- (Eng) Two Phase Locking Protocols In Lock Based Protocols | Concurrency Control | DBMS Course
7.26- (Eng) Two Phase Locking Protocols In Lock Based Protocols | Concurrency Control | DBMS Course
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Two-phase Locking Protocol
Two-phase locking protocol guarntees serializability. In this protocol, every transaction issue
lock and unlock requests in two phases.
(i) Growing phase : In this phase, transaction can obtain new locks but cannot release
any lock.
(ii) Shrinking or contracting phase : In this phase, transaction can release locks, but
cannot obtain new locks.
Lock Point : In growing phase, the point at which transaction has obtained its final lock
is called Lock Point.
In two phase locking protocol, all transactions can be ordered according to their lock
points. Transactions T1 and T2 in Figure 8.9 follows two phase locking protocol.
356 Introduction to Database Management System
Not-possible
because B is locked
in shared mode by
T2 and T1 have to
wait for B.
Not-possible
because A is locked
exclusively by T1
and T2 have to
wait for A.