1.If the best plan so far takes less than 0.1 seconds to execute, stop the search. If the best
plan so far takes less time to execute than twice the search time so far, stop the search.
2.(a)Re-compiling a query plan will have been unnecessary if there is a subsequent
amendment before the plan is used. (b) Compiling a new plan when an application is
next invoked will affect the application’s performance for that first invocation.
Section 18.3.1
1.(a) All the rows (i.e. 7). Duplicate values are allowed for studentName, so every
row must be checked for a match. (b) As studentNo is the identifier of Student, there are
no duplicate ...
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