Skip to main content

Distributed transaction model-oocomputerworld

 Distributed transaction model

Distributed transaction model:- To access the various data items in a distributed system is usually e accomplished through transaction there are two type of transaction that we need to consider

  1. The local transaction
  2. The Global transaction 

 The local transaction:- The local transaction are those that access and update data is only one local database. 

The global transaction:- global transaction are those that access and update data in several local database in the case of global transaction the task is more complicated since several nodes may be participating in execution the failure of a communication link connecting these nodes may result in erroneous computation.

 System structure :- Each node has its oven local transaction manager whose function is to ensure those transaction that execute at that site. The various transaction manager corporate to execute global transaction. To understand how such a manager can be implemented we define and abstract model of a transaction system each node of the system contains two sub system. 

The transaction manager :- The transaction manager manages the execution of those transaction that access data stored  in a local node.

 Transaction coordinator :- The transaction coordinator coordinates the execution of various transaction both local and global.

 The structure of a transaction manager is similar to centralized system and each transaction manager is responsible for maintaining a log  for recovery purpose and execution of the transaction at the node.

 Transaction coordinator is responsible for starting the execution of the transaction and breaking transaction into a number of such transaction and distributing these Sub transaction to the appropriate nodes for execution.

  Database system vs file system

 Nested relation

what is computer worm-computer world

  What is google Search Engine

Logical database model and  Relational database management system

Definition of computer cables and types of cables

Register and type of register in computer Architecture

What is buffering

Definition of computer ports and types of ports

what is computer and what is the meaning of computer

Definition of computer cables and types of cables

Difference between Linux and Unix-computer world

Demand paging-oocomputer world

  What is CSS-computer world

What is internet-computer world

Round-Robin Scheduling in operating system-computer world

Comments

Post a Comment

Popular posts from this blog

Single partition allocation, Multiple-partition allocation and Fixed Equal-size partitions in operating system-computer world

  Single partition allocation, Multiple-partition allocation and Fixed Equal-size partitions in operating system Single partition allocation In this scheme operating system is residing in law memory and user process are executing in higher memory. Advantages It is simple  It is easy to understand and use Disadvantages User job is limited to the size of available memory. It leads to poor Utilization of processor and memory. Multiple-partition allocation  It is the simplest method for allocating  memory is divided memory into several fixed size partitions. Fixed Equal-size partitions It divides the main memory Into equal number of fixed sized partitions, operating system occupies some fixed portion and remaining portion of main memory is available for user processes. Advantages It supports multi programming. A process whose size is less then or equal to the partitions size can be loaded into any available partition. Disadvantages If a program is big to fit in...
Post a Comment
Read more

What is web browser-computer world

                    What is web browser Web Browser A web browser is a program that your computer runs to communicate with web servers on the internet. Web browser must understand HTML and display text. Web browser are interpreter of HTML language web pages are HTML document send by server on client request and after reaching this document to client side the web browser intro parrots this HTML document in graphical interface.  Web client run Special software called a browser that allow them to  Connect to an appropriate server Query the server for the information to be read.   Provided and interface to read the information returned by the server. web Browser are software installed on your PC. To Excess the you need a web browsers, such as Netscape navigator, Microsoft Internet Explorer or Mozilla Firefox. There are four leading web browser Explorer, Firefox, Netscape and Safari but there are some other browsers a...
Post a Comment
Read more

What is computer and its characteristics-computer world

  What is computer and its characteristics  Computer  :  Computer is an electronic data processing device, which accept and store data input, process the data and generates the output in a required format. computer is made up of integrated  parts (input, control, ALU, storage and output unit) All the part work together to process data so, we can say that a computer is a programmable electronic device accept row data as input and process it with  set of instruction to produce the result as output. Meaning of computer The word "computer" comes from the word "compute" which means to "calculate". The word computer is derived from the Latin word compute which means to calculate. Characteristics of computer Automatic : It is a automatic machine work by itself without human instruction. Speed :  A computer is a very fast devices. It can perform in a few second, the amount of work that a human being can do in an entire year.  Accuracy : In addition t...
1 comment
Read more