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Consider a database system that includes an atomic increment operation, in addition to the read and write operations. Let V be the value of data item X. The operationincrement(X) by Csets the value of X to V + C in an atomic step. The value of X is not available to the transaction unless the latter executes a read(X). Figure 15.23 shows a lock-compatibility matrix for three lock modes: share mode, exclusive mode, and incrementation mode.
a. Show that, if all transactions lock the data that they access in the corresponding mode, then two-phase locking ensures serializability.
b. Show that the inclusion of increment mode locks allows for increased concurrency. (Hint: Consider check-clearing transactions in our bank example.)
1. Define the terms COMMIT, ROLLBACK, and SAVEPOINT as they relate to data transactions. 2. What data will be committed after the following statements are issued?
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