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!
Software failures: In such cases, a software error abruptly stops the implementation of the current transaction (or all transactions), therefore leading to losing the state of program implementation and the contents / state of the buffers. But what is a buffer? A buffer is the portion of RAM that kept the partial contents of database that is currently needed by the transaction. The software failures can further be subdivided as:
a) Application or Statement program failure
b) DBMS software failure
c) Failure due to viruses
d) Operating system failure
A Statement of program may cause abnormal termination if it does not implement totally. This happens if during the implementation of a statement, an integrity constraint gets desecrated. This leads to irregular termination of the transaction because of which any prior updates made by the transaction may still get reflected in the database going it in an inconsistent state.
A failure of transaction can happen if some code in a transaction program leads to its abnormal termination. For instance, a transaction can go into an infinite loop.
In such a case the only technique to break the loop is to abort the program. Likewise, the failure can be traced to the DBMS or operating system and transactions are aborted abruptly. Therefore part of the transaction that was implemented before abort may cause some updates in database, and therefore the database is updated only partially which leads to an inconsistent state of database.
Question (a) Differentiate between the following terms: (i) Distributed Database v/s Distributed Database management System (ii) Homogeneous Distributed Database v/s Hete
prototype of a distributed information system for a national car part retail outlet chain.
Describe DROP TABLE command of SQL along with both the options - CASCADE and RESTRICT. DROP TABLE command - This command drops the specified table. Dropping a table also dro
Normal 0 false false false EN-US X-NONE X-NONE
what are the main characteristics of database
What do you mean through integrity constraints? Integrity Constraints -An integrity constraint is a condition specified on a database schema and restricts the data in which
1. Use the Invoice table structure shown below to answer the following questions: a) Draw the dependency diagram and identify the primary key and all dependencies, including al
Change the city of First Bank Corporation to ‘New Delhi' UPDATE COMPANY SET CITY = ‘New Delhi' WHERE COMPANY_NAME = ‘First Bank Corporation';
Explain Candidate key? Candidate Key - A candidate key is a minimal superkey, that can be used to uniquely identify a tuple in the relation.
Problem 1 Why are the operational system keys not recommended for forming data warehouse primary keys? Give any two examples 2 Explain the following performance tuning techn
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