Web Reference: Feb 8, 2026 ยท The Two-Phase Locking (2PL) Protocol is a key technique used in DBMS to manage how multiple concurrent transactions access and modify data. When many users or processes interact with a database, itโs important to ensure that data remains consistent and error-free. The 2PL locking protocol is represented diagrammatically as follows โ In the growing phase transaction reaches a point where all the locks it may need has been acquired. This point is called LOCK POINT. After the lock point has been reached, the transaction enters a shrinking phase. Intention-Shared(IS): Intent to get S lock(s) at finer granularity. Intention-Exclusive(IX): Intent to get X lock(s) at finer granularity. Shared+Intention-Exclusive(SIX): Like S and IX at the same time.
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