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Briefly describe concurrency execution?
Lock - based protocols
Locks
There are several modes in which a data item may be locked in this section we restrict our attention to two modes
Ø Shared
Ø Exclusive
T1 : lock - x(B );
read(B);
B:=B-50;
write(B);
unlock(B);
Lock-x(A);
read(A);
A:=A+50;
write(A);
unlock(A).
1. Create the tables for the play-scheme database as specified in the TMA. 2. Enter the data as given in the spreadsheet. 3. Create queries to retrieve specified information
Logical Operators Rules of Precedence: Order evaluated Operator 1 All comparison operators 2
What is storage manager? A storage manager is a program module that gives the interface among the low level data keeps in a database and the application programs and queries su
wrie a report on whether a BSc n information systems develops the skills required by employers in Database administration
Creating views with Read only option : In the view definition this option is used to make sure that no DML operations can be done on the view.
List the steps for converting state diagram to the code. a) Finding major control path b) Finding the conditional statements c) Finding the loops d) Finding error ro
Q. Explain the terms key constraints participation constraints and mapping caradinalities in ER model. Participation Constraints : The participation of an entity set E i
Explain the structure of well formed formulae in relational calculus. Ans: a. An atom is a formula b. If P1 is a formula, after that so are ¬P1 and (P1) c. If P1 and P2 a
A B-tree of order how much children m has maximum ? m has maximum m mchildren in a B tree.
What is B-Tree? A B-tree eliminates the redundant storage of search-key values .It permits search key values to appear only once.
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