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What are the reasons for having variable length records? What are the various ways to store variable length records?
Variable-length records arise in a database in various ways:
(i)Storage of multiple items in a file. (ii)Record types allowing variable field size (iii)Record types allowing repeating fieldsVarious ways of storing variable length records:
(i) In fixed form through allocating every record, maximum amount of space in which can be occupied a record and padding smaller sized records along with nulls. (ii) Special separator characters among the records to delineate variable length records.
Types of Locks There are two necessary types of locks: Binary lock : This locking mechanism has two states for to a data item: locked or unlocked Multiple-mode loc
what problems are raised by the database? why is it so controversial? why is data quality an issue?
Define the terms 1) physical schema 2) logical schema. Physical schema: The physical schema explains the database design at the physical level, which is the lowest lev
Example: Consider the following relations: ROLLNO NAME ADDRESS COURSE_ID 100 Ka
Determine the steps of path in association network You can analyse use of paths in association network in the following steps: Examine every operation and see what asso
client server architeutre
Why 'AS' clause is used in SQL ? 'As' clause is used for Rename operation. ‘AS' clause is used in SQL for rename operation. (e.g., SELECT ENO AS EMPLOYEE_NO FROM EMP)
What is B-Tree? A B-tree eliminates the redundant storage of search-key values .It permits search key values to appear only once.
a brief definition
1) Define a job scheduling strategy that will meet business requirement of reporting availability by 6am CST for the following cubes? Show the job scheduling dependencies in a pict
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