Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Indexed (Indexed Sequential) File Organisation
It organises the file like a big dictionary, i.e., records are kept in order of the key but an index is stored which also allows a type of direct access. The records are kept sequentially by primary key values and there is an index built over the primary key field.
The retrieval of a data from a sequential file, on average, needs access to half the records in the file, making such inquiries not only useless but very time consuming for big files. To improve the query response time of a sequential file, a type of indexing method can be added.
An index is a set of address pairs, index value. Indexing associates a set of objects to a set of orderable quantities, which are generally smaller in number or their properties. Therefore, an index is a mechanism for faster search. While the indices and the data blocks are stored together physically, they are logically distinct. Let us use the word an index file to defines the indexes and let us refer to data files as data records. An index can be small sufficient to be read into the main memory.
A sequential file that is indexed on its primary key is known as an index sequential file. The index permits for random access to records, as the sequential storage of the records of the file gives easy access to the sequential records. An additional feature of this file system is the over flow area. The overflow area gives additional space for record addition without the need to make.
What are the uses of ODBC? Under what circumstances we use this technology? ODBC expose database capabilities within a standardized way to the application programmer by an ap
how many types of data model in DBMS? explain data abstraction with its different level
Given the following set of functional dependencies {cf→ bg, g → d, cdg → f, b → de, d → c} defined on R(b,c,d,e,f,g) a. Is cf→ e implied by the FDs? b. Is dg a superkey?
Define database management system? Database management system (DBMS) is a set of interrelated data and a combination of programs to access those data.
for the following business rules . Identify all entities, attributes, relationships, primary keys, cardinalities and constraints where appropriate 3. (9) An art museum owns a larg
Update Operations and Dealing with Constraint Violations There are three basic operations to be executes on relations: Insertion Deletion Update The INSER
what should be included in this???
what is specialization?
In E-R Diagram how derived attribute are represented ? In E-R Diagram By Dashed ellipse derived attribute are represented.
When every condition appears with equality condition (=) only. c) Natural join (denoted by R*S) When two join attributes have the similar name in both relations. (Tha
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd