A distributed transaction, Database Management System

Assignment Help:

A Distributed Transaction

Let us demonstrate the concept of a distributed transaction by considering a banking system having of three branches located in 3 different cities. Every branch has its own computer with a database having of all the accounts maintained at that branch. Each such installation is therefore a site. There also exists one single site which preserves information about all the other branches of the bank. Assume that the database systems at the several sites are based on the relational model. Every branch preserves its portion of the relation: DEPOSIT (DEPOSIT-BRANCH) where DEPOSIT-BRANCH = (branch-name, customer-name, account-number, balance)

A site having information about the 4 branches maintains the relation branch- details, which has the schema as:

BRANCH-DETAILS (Financial_ health, branch-name, city)

There are other relations maintained at the several sites which are ignored for the purpose of our example.

A local transaction is a transaction that accesses accounts in only one single site, at which the transaction was started. A global transaction, on the other hand, is one which either accesses accounts in a site dissimilar from the one at which the transaction was started, or accesses accounts in various different sites. To demonstrate the difference among these two types of transactions, take the transaction to add Rs.5000 to account number 177 located at the Delhi branch. If the transaction was started at the Delhi branch, then it is considered local; or else, it is considered global. A transaction to transfer Rs.5000 from account 177 to account 305, which is located at the Bombay branch, is a global transaction as accounts in two dissimilar sites are accessed as a result of its implementation. A transaction finding the total financial standing of each branch is global.

What creates the above configuration a distributed database system are the facts that:

  • The several sites may be locally controlled yet are aware of each other.
  • Every site gives an environment for executing both global and local transactions.

Though, a user need not know whether on underlying application is distributed or not.


Related Discussions:- A distributed transaction

What is class diagram, Class Diagram A class diagram is required to su...

Class Diagram A class diagram is required to support functional necessity of system. In a static design view, class diagram is used to model vocabulary of the system, simple c

Database system design and Implementation, Consider a typical sales invoice...

Consider a typical sales invoice that would include the following information. Design a single table to hold all of the information required to store an invoice including this info

Foreign keys , Foreign Keys and NULL Let us take the relation:         ...

Foreign Keys and NULL Let us take the relation:                 DEPT DEPT ID DNAME BUDGET D1 M

Give short note on the following terms- dirty pages and etl, Give short not...

Give short note on the following terms:Dirty pages and ETL a.) Dirty pages. These are buffer pages which comprise modifications which haven't been written to disk. b.

Selective replication-data replication, Selective replication: This is a c...

Selective replication: This is a combination of generating small fragments of relation and replicating them rather than a entire relation. The data should be fragmented on require

Define the phases of two phase locking protocol, Define the phases of two p...

Define the phases of two phase locking protocol Growing phase: a transaction may get locks but not release any lock. Shrinking phase: a transaction might be release locks bu

Describe participation constraints, Describe Participation Constraints? ...

Describe Participation Constraints? Participation Constraints - The participation constraint exacts whether the existence of an entity depends on its being related to another

What is data model explain object and data base models, What is data model?...

What is data model? Explain object based and record based data models? Ans: A data model is an abstract model in which describes how data is represented and accessed. (i)

Explain the equijoin, Explain the θ-join and equijoin Refer tables Car ...

Explain the θ-join and equijoin Refer tables Car and Boat which list models of cars and boats and their relevant prices. Assume a customer wants to buy a car and a boat, but sh

Which operation is used if we are interested certain columns, Which operati...

Which operation is used if we are interested in only certain columns of a table? PROJECTION operation is used if we are interested in only certain columns of a table.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd