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An online database is searched in order that the consumer can find the product they are looking to purchase, and it is selected. The customer then checks out, and their information is added to a customer database so the company can email the customer periodically; first to review the product and then any time after when the company things the consumer may be interested in a new product. The customer databse also prevents consumers from having to re-enter all their information, such as a shipping address, each time they purchase something from the same website.
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How a database can be recovered from failed transaction?
A database can be recovered from a failed transaction using a method called rollback, which reverts the database to its last consistent state before the transaction began. This is typically achieved through a transaction log that records all changes made during transactions. If a failure occurs, the database management system (DBMS) uses the log to undo any changes made by the incomplete transaction, ensuring data integrity. Additionally, in some systems, checkpointing can be used to minimize the amount of data that needs to be rolled back.
What is rollback in database?
Rollback in a database refers to the process of reverting a database to a previous state, typically used to undo changes made during a transaction that has not yet been committed. It ensures data integrity by allowing users to recover from errors or failures, thereby maintaining consistency in the database. When a rollback is executed, all changes made during the transaction are discarded, and the database returns to the last committed state. This is crucial for maintaining reliability in multi-user environments where concurrent transactions may occur.
Which two files used during the operation of Rdbms?
During the operation of a relational database management system (RDBMS), two key files used are the data file or database file, which stores the actual data in tables, and the transaction log file, which records all changes made to the database to ensure data integrity and provide recovery in case of failures.
What is transaction wait for graph (TWF)?
A Transaction Wait-For Graph (TWF) is a directed graph used in database systems to represent the wait-for relationships among transactions. In this graph, each node represents a transaction, and a directed edge from transaction A to transaction B indicates that transaction A is waiting for a resource held by transaction B. By analyzing the TWF, database systems can detect deadlocks; if there is a cycle in the graph, it indicates that a deadlock has occurred, prompting the system to take corrective action. This method is crucial for maintaining concurrency and ensuring efficient transaction management.
What is e commerce used for?
Ecommerce stands for electronic commerce. Electronic commerce is the term for any type of business transaction that takes place by transferring information over the internet.
What do you mean by locking in database system?
here the locking means is that the resource has been acquired on particular data(table) and that resource can not used by another transaction till it locked by any other transaction.
How do computer used to maintain records in business?
It is used with business software that holds database to keep the records of every business transaction on a storage media. It can be use on single standalone for personal business or a large scale world wide network for a large scale business, where a server is maintained that holds the database. Client computers are for the front-line transaction.
Which protocol is used for eCommerce?
Security is an essential part of any transaction that takes place over the internet. Online business uses transport layer security protocol and secure socket layer protocol.
How can you ensure data integrity can be maintained in your database?
Data integrity is preserved by encapsulating unit-of-work actions, such as a transfer from one account to another, in a transaction.The database implementation ensures that either all of the transaction commits, or none of it commits. In the event of a failure and restart of the database, all incomplete transactions are uncommitted, i.e. rolled back.While the transaction is in-flight, any query to data elements used by the transaction reliably retrieve the value they allhad prior to transaction start. Also, any transaction attempting to lock any of those elements for other unit-of-work actions are forced to wait until the first transaction is complete.
Which two file are used during the operation of dbms?
data dictionary and transaction log
What is canned transaction in dbms?
Canned transactions are standard types of queries and updates which frequently used by Naive or parametric end users to constantly querying and updating database--Suresh
Write a detailed note on Transaction Analysis?
A transaction Analysis is a psychotherapy that analysis everyday communications. The ego status is used to place the state of mind during the analysis.
