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Define two-phase locking protocol.
Ans: Two-phase locking is significance in the context of ensuring that schedules are serializable. The two-phase locking protocol defines a process each transaction follows.
The two-phase locking protocol
1. Previous to operating on any row, a transaction must obtain a lock on that row.
2. After releasing a lock, a transaction should never obtain any more locks.
Structure of Client Server Systems: In client/server architecture, clients show users who require services while servers give services. Both client and server are a combination of
The PROJECT operation The project operation is used to choose the records with specified attributes as discarding the others based on some related criteria. This is denotes as ∏
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differences between a classified catalog and a dictionary catalog
Create an index for the table Client, field CLIENT_NO of Q ? Command: CREATE INDEX client_client_no ON client(client_no);
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Compute the closure (F+) for the following set of the functional dependencies defined on R(a,b,c,d), where F - {c→ a, ab → d, a → b, d → c}, i.e. what are all of the FDs implied b
Atomicity : Either all functions are laid out or none are. Users could not have to think about the effect of incomplete operations. DBMS ensures this by undoing the functions
Which is a legal expression in SQL? SELECT NAME FROM EMPLOYEE is a legal expression in SQL.
What are the aggregate objects in the data dictionary? Views Match codes Lock objects.
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