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Define Catalog and meta data ?
A catalog is a compilation of records elaborating the contents of a particular collection or group of collections. Metadata (Meta data, or sometimes metainformation) is "data about data", of any sort in any media. An item of metadata might elaborates an individual datum, or content item, or a collection of data involving multiple content items and hierarchical levels, for instance a database schema.
The following variant of the primary copy asynchronous-update replication protocol has been proposed for totally replicated systems. (a) A transaction executing at site A updat
Compute the closure (F+) for the following set of the functional dependencies defined on R(a,b,c,d), where F - {c→ a, ab → d, a → b, d → c}, i.e. what are all of the FDs implied b
various techniques of hashing?
what is specialization?
Describe identifying relationship? Identifying relationship: It is relationship among strong entity and a weak entity it is represented through a doubly outlined diamond in C
Surgeons identified by doctor ID (DOCID) operate on patients identified by patient ID (PATID) in operating theaters identified by room numbers (ROOMNO). Each surgeon can operate on
Explain algorithm of ER To Relational Mapping ? ER-to-Relational Mapping Algorithm: 1) Step 1: Mapping of regular entity types: For each strong entity type E, form a relatio
what is union compatable?
Greater potential for bugs: Since the sites of a distributed system operate simultaneously, it is more complex to ensure the correctness of algorithms. The art of constructing dis
What are the properties in a relation ? In a relation Ordering of rows is immaterial and No two rows are identical.
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