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Describe a technique for direct search? Explain how data is stored within a file so which direct searching can be performed.
For a file of unordered fixed length records by using unspanned blocks and contiguous allocation, it is straight forward to access any record through its position in the file. If the file records are numbered 0,1,2,---,r-1 and the records in every block are numbered 0,1,---bfr-1; whereas bfr is the blocking factor, then ith record of the file is situated in block [(i/bfr)] and is the (I mod bfr) record in that block. Such a file is frequent known as a relative or direct file because records can simply be accessed directly through their relative positions. Accessing a record based on a search condition; thus, it facilitates the construction of access paths on the file, like as the indexes.
Question: In relation to distributed database answer the following questions: (i) Give a brief definition of distributed database. Support your answer with an appropriate di
To eliminate duplicate rows (distinct operator) Example: SELECT DISTINCT DEPTNO FROM EMP;
Consider the relation PERSON. If you want to display details of persons having age less than or equal to 30 than the select operation will be used as follows: σ AGE The resu
Enumerate or state the steps in creating a relevant database of a shop.
Redo Logs: Any database must have minimum two redo logs. These are the rules for the database; the redo logs record all modifies to the system objects or user objects. If any type
Chapter 1 - Profile for the Organization You have to select an organization of your choice and assume that you work for that organization. Now you must prepare a brief profile of t
Differance between internal and external schema? Internal and external schema: Internal Schema • Describes the physical storage structure • Uses a physical data model External
Deadlock Prevention One of the easiest approaches for avoiding a deadlock would be to obtain all the locks at the begin of the transaction. Though, this approach restricts conc
#questiontypes of keys examples..
Section A: Use the following tables to create a database called College. Use SQL commands. Student stuid(primary) lastName firstName
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