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!
Describe the storage structure of indexed sequential files and their access method.
Ans: Storage structure of Indexed Sequential files and their access: To achieve fast random access to records in a file, we can utilize an index structure. An index record contains a search key value and pointers to data records that is related with a specific search key. An ordered index stores the values of the search keys in sorted order. A file may have various indices on different search keys. If the files consisting of the records are sequentially ordered, a primary index is an index whose search key also describes the sequential order of the file. Such types of files are termed as index sequential files. There are two sorts of ordered indices: dense and sparse. In dense index, and index record appears only for a few of the search-key in the files as displayed below.
To access a specific record with search key value, K, by using dense index we search index record along with search key value, K, by which reach the first entry of data record along with search key value K. After that the data records are searched linearly to acquire the required record. If either the index record is not there or the linear search arrive the data record with different search key value, then the record is not there. Here now for sparse index, we search index record along with search key value, K or the index record with highest search key value less as compared to K, from which arrives the first entry of data record with search key value K or highest value less than K. After that the data records are searched linearly to acquire the required record. If the linear searches the data record with search key value greater as compared to K, then the record is not there.
Define Cascading rollback The phenomenon where a single transaction failure leads to a series of transaction rollbacks is known as Cascading rollback.
What benefits can a company gain by managing its own information infrastructure and servicea
Objectives differentiate DDBMS and conventional DBMS; Describe Network topology for DDBMS; Describe the concepts of horizontal and vertical fragmentation; Descr
The database application project (DAP) for this assignment consists of the creation of a fully functional Microsoft Access database application for a real client. I recommend you s
Example - ALTER TABLE emp MODIFY (empno NUMBER (7));
What is the aim of logical schema ? The main motive of the logical schema is to ensure the portability of procedures and models on various physical schemas at runtime.
What are called jukebox systems? Jukebox systems have a few drives and numerous disks that can be loaded into single of the drives automatically.
Define instance and schema? Instance: Collection of data kept in the data base at a particular moment is known as an Instance of the database. Schema: The o
Explain the term- Query. Queries are used to repossess and show specific records in a table. They can also be used to show specific fields of specific records, which meet the co
What are the function of DBA?
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: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd