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Determine the Objectives of object oriented design
what is correlation in nested query
Give the reasons for allowing concurrency? The reasons for allowing concurrency is if the transactions run serially, a short transaction might have to wait for a preceding long
What are the uses of the information in the Data dictionary? The following information is directly taken from the Data dictionary: Information on fields displayed with
Define Network DBMS The NDBMS is built primarily on a one-to-many relationship, but where a parent-child representation between the data items cannot be ensured. This may occur
What are the two types of errors? The two types of errors are: a) Logical error b) System error
What is a trigger
What are the basic objects of the data dictionary? Tables Domains Data elements Structures Foreign Keys
What is the difference among a primary index and a secondary index? Primary Index: A primary index is an ordered file whose records are of fixed length along with two fields.
Define query optimization. Query optimization refers to the process of search the lowest -cost method of evaluating a given query.
What is a Transaction? A transaction is an event which happens on the database. Generally a transaction reads a value from the database or writes a value to the database. If y
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