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What is system log? What are the entries?
Ans: The system log that is generally written on stable storage contains the redundant data required to recover from volatile storage failures and as well from errors discovered by the transaction or the database system. System log is as well known as log and has sometimes been called the DBMS journal. It consists of the following entries (also known as log records):
a. [start_transaction, T]: Points out that transaction T has started execution.
b. [write_item, T, X, old_value, new_value]: Points out that transaction T has changed the value of database item X from old_value to new_value.
c. [read_item, T, X]: Points out that transaction T has read the value of database item X.
d. [commit, T]: Points out that transaction T has completed successfully, and affirms that its effect can be committed (recorded permanently) to the database.
e. [abort, T]: Points out that transaction T has been aborted.
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
The Assessment page has a link to download a conceptual model, and a list of data. You are to map this conceptual model, and create the database in Oracle using your own DDL. T
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What is an ERD?
write-set(T): Each data items that are written by a transaction T
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What is relational model feature? A relational model feature is much more data independence than some other database models.
lock and types of lock
What is a disjoint less constraint? Ans: It needs that an entity belongs to no much more than one level entity set. Disjoint less constraint needs that an entity belongs to
Explain the Strategy of Database Planning ?
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