1. 18.3 Test Questions
By Donavon M. Norwood
03/04/2009

2. Locks are use on database elements to:
Maintain the locking table
Request from transactions
Prevent unauthorized access to DB
Prevent unserializable behavior

3. 2) The scheduler uses the Locking Table to:
Backup the database
Join two tables
Issue select statements from users
None of the above

4. 3) Locks have the intended meaning:
Locks DB from unauthorized access
Allows access to Locking table
No two transactions may have locked the same element without one having first released the lock
Allows transactions to be consistent/inconsistent

5. 4) The Locking Table is used by the scheduler to:
Process data
Provide a illegal schedule of transactions
Commit data written by transactions
Guide the decision of the scheduler to allow or block transactions

6. 5) Which is the correct events for locking:
a) r(A); u(A); w(A); l(A)
b) w(A); u(A); r(A); l(A)
c) l(A); r(A); w(A); u(A)
d) u(A); w(A); l(A); r(A);

7. GOOD LUCK!