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read-set(T) : Each data items that are read by a transaction T Timestamps : for all transaction T, the start-time and the end time are reserved for all the three phases.
how does Btree differ from a B+ - tree?
Define the five basic operators of relational algebra? Five basic operators of relational algebra are: 1. Union (∪∪∪∪) - Selects tuples which are in either P or Q or in both
Write a program within embedded SQL to associative the total trip expenses of the salesman named ‘John' for the relations. EXEC SQL BEGIN DECLARE SECTION; long total_expenses;
What is the role of a database administrator?
how to design tables
When a function module is activated syntax checking is performed automatically. YEs, a function module is activated syntax checking.
Can you assist me in Database management system? I need help in my courses, please email me at and get back me soon...
In E-R diagram how generalization is represented? in E-R diagram generalization is represented by Triangle shape.
Differance between internal and external schema? Internal and external schema: Internal Schema • Describes the physical storage structure • Uses a physical data model External
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