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Explain Data Dictionary in short?
What are the two distinct aspects to the implementation of associations? i) It is required to define data declarations which will enable details of actual links to be stored. I
DISADVANTAGES OF RDBMS
Database Errors: An error is said to have occurred if the implementation of a command to manipulate the database cannot be successfully finished either due to inconsistent data or
What is the difference between serial and sequential files? How searching is applied on both? Ans: A serial file is one where the records have been stored in the order where
Relational Model: The relational model uses a collection of tables to represent both data and the relationships among those data. Each table has multiple columns and each column h
how draw er diagram
Explain the Aggregation implies concurrency Concurrency actually is: This in objects can be identified by the way they change state. Present objects can change state independen
let us consider a table having 2200 records and the fixed size of the table to be considered as 25.then how many numbers of table is requredto perform horizontal fragmentation
What is an entity relationship model? The entity relationship model is a set of basic objects known as entities and relationship between those objects. An entity is a thing or
It is mandatory that for every table in the LDB hierarchy there should exist one GET statement in the report. False. It is not essential.
A data dictionary subsystem keeps way of the definitions of all data items in database. This includes elementary-level data items, fields, group and record-level data structures, as well as relational tables. It keeps way of relationships that is between varieties of data structures. It maintains indexes that are used to access data speedily. It also keeps track of screen and report format definitions that might be used by a range of application programs.
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