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How external/conceptual mapping and conceptual /internal mapping is performed
Consider a systems development project with the following data Activity Duration (weeks) Precedence Relationship 1. Software design
Question 1 Explain the concept of database recovery management. Explain the different levels of backup used for recovering data Question 2 What are the different types of par
why are older data models are being replaced by new data models
Explain the three data models namely relational, network and hierarchical and evaluate their relative advantages and disadvantages. Hierarchical Model: In hierarchical model, da
What is persistency? Persistency ensures which data is stored and that after the object is no longer available (program stops running) the data will be available to other users
Explain What is Relation? A database relation is a predefined row or column format for storing information in a relational database. Relations are equal to tables.
One-to-one relationship: For every 1:1 relationship type R in the ER diagram including two entities E1 and E2 we take one of entities (say E1) preferably with total participatio
Support by Adding Indexes Multiple indexes can be used to access a data file by multiple access paths. In such a scheme only single copy of the data is consider, only the numbe
Drawbacks of Database systems ?
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