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What is conceptual schema?
The schemas at the view level are known as subschema that describe dissimilar views of the database.
what is query processing ,query optimization and performance turring?
When It is better to use files than a DBMS? It is better to use files than a DBMS when Multiple users wish to access the data.
Explain about database system structure? Storage manager Authorization and integrity manager Transaction manager File manager Buffer manager Storage manager
How is concurrency identified? Concurrency in objects can be identified by the way they alter their state. Current objects can change their state independently. Aggregation imp
Our company hires independent contractors to install equipment at precise locations across North America. We want to track the installation data and generate reports. The compan
The JOIN operation is applied on two relations. When we want to choose related tuples from two given relation join is used. The join operation need that both the joined relations m
why are older data models are being replaced by new data models
a) Suppose we updated the catalog tables in real time, that is, after every update, insert, or delete SQL statement were executed-rather than only running RUNSTATS once every few
Candidate Key: In a relation R, a candidate key for R is a subset of the set of attributes of R, which have the differnt two properties: (1) Uniqueness: N
A super key is an attribute or set of attributes used to recognize the records uniquely in a relation. For instance, in the Relation PERSON defines earlier PERSON_ID is a super
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