Explain the timestamp ordering protocol, Database Management System

Timestamp Ordering Protocol

A timestamp is a tag that can be attached to any transaction or any data item, which indicates a specific time on which the transaction or data item had been activated in any way. We, who use computers, must all be familiar with the methods of "Date Created" or "Last Modified" properties of files and folders. Well, timestamps are things like that.

A timestamp can be executed in two ways. The simplest one is to directly assign the current value of the clock to the transaction or the data item. The other policy is to attach the value of a logical counter that keeps incrementing as new timestamps are needed.

The timestamp of a transaction shows the time when it was first activated. The timestamp of a data item can be of the following two types:

W-timestamp (Q): This means the latest time when the data item Q has been written into.

R-timestamp (Q): This means the latest time when the data item Q has been read from.

 

Posted Date: 7/26/2013 7:15:12 AM | Location : United States







Related Discussions:- Explain the timestamp ordering protocol, Assignment Help, Ask Question on Explain the timestamp ordering protocol, Get Answer, Expert's Help, Explain the timestamp ordering protocol Discussions

Write discussion on Explain the timestamp ordering protocol
Your posts are moderated
Related Questions
What is meant by mean time to failure? The mean time to failure is the amount of time that the system could run continuously without failure.

1) Define a job scheduling strategy that will meet business requirement of reporting availability by 6am CST for the following cubes? Show the job scheduling dependencies in a pict

How can you map NULL values to other values while display? IF( ) , IFNULL( ) keywords are used to do so. They are 'LIMIT' is used for the following kinds of problems: 1) Ans

WHAT IS DSS? WRITE ITS REQUIREMENTS.

In a Hierarchical model of data records are organized ? In the hierarchical model of data records are organized as Tree structure.

Do you have experts of the dbms

tell me the functionality,advantages and disadvantages of student database

What is SQL Profiler? SQL Profiler is a graphical tool that permits system administrators to monitor events in an instance of Microsoft SQL Server. You can capture and save dat

as a customer service employee explain five measures you would recommend to make even a displeased students patronize the school canteen

Determine the Disadvantages of file based systems Some of the disadvantages of file based systems are like this: Data redundancy and inconsistency: the dissimilar applic