Lock based protocols
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This document discusses lock-based protocols for concurrency control. It describes that locks can be requested in exclusive or shared mode to control concurrent access to data items. A lock compatibility matrix is used to determine if a requested lock is compatible with existing locks held by other transactions. The Two Phase Locking protocol is introduced to ensure conflict serializable schedules by restricting transactions to an growing phase where they only acquire locks and a shrinking phase where they only release locks.
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Lock based protocols
- 2. LOCK BASED PROTOCOLS A lock is a mechanism to control concurrent access to a data item Data items can be locked in two modes : 1. exclusive (X) mode. Data item can be both read as well as written. X-lock is requested using lock-X instruction. 2. shared (S) mode. Data item can only be read. S-lock is requested using lock-S instruction. Lock requests are made to the concurrency-control manager by the programmer. Transaction can proceed only after request is granted.
- 3. LOCK BASED PROTOCOL(CONTD) Lock-compatibility matrix A transaction may be granted a lock on an item if the requested lock is compatible with locks already held on the item by other transactions Any number of transactions can hold shared locks on an item, But if any transaction holds an exclusive on the item no other transaction may hold any lock on the item. If a lock cannot be granted, the requesting transaction is made to wait till all incompatible locks held by other transactions have been released. The lock is then granted.
- 4. LOCK BASED PROTOCOL(CONTD) Example of a transaction performing locking: T2: lock-S(A); read (A); unlock(A); lock-S(B); read (B); unlock(B); display(A+B) Locking as above is not sufficient to guarantee serializability if A and B get updated in- between the read of A and B, the displayed sum would be wrong. A locking protocol is a set of rules followed by all transactions while requesting and releasing locks. Locking protocols restrict the set of possible schedules.
- 5. TWO PHASE LOCKING PROTOCOL This protocol ensures conflict-serializable schedules. Phase 1: Growing Phase Transaction may obtain locks Transaction may not release locks Phase 2: Shrinking Phase Transaction may release locks Transaction may not obtain locks The protocol assures serializability. It can be proved that the transactions can be serialized in the order of their lock points (i.e., the point where a transaction acquired its final lock).
- 6. TWO PHASE LOCKING PROTOCOL(CONTD) There can be conflict serializable schedules that cannot be obtained if two- phase locking is used. However, in the absence of extra information (e.g., ordering of access to data), two-phase locking is needed for conflict serializability in the following sense: Given a transaction Ti that does not follow two-phase locking, we can find a transaction Tj that uses two-phase locking, and a schedule for Ti and Tj that is not conflict serializable.
- 7. THANK YOU