lotus by anandakumar_p & santhoshkumar

8/14/2019 LOTUS by Anandakumar_P & SanthoshKUmar

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Lotus notes is completely different distributeddocument based system.

It is database-oriented system originating from the theLotus Development Corporation, but its entire sales and

development are handled by IBM, which bought Lotus inthe late 1990s.

It runs on various windows and UNIX platforms.


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Lotus Notes system is organized as a client-server system.

Notes was originally designed to work over local-areanetworks, but now also runs across wide-area networks suchas internet.

Main components of Lotus Notes Clients

Servers Databases Middleware layer


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The general organization of a Lotus Notes system

Con(Overview Lotus Notes)


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Each client and server can have several locally

associated database.Each database forms a collection of notes, with a note being the key data element in any Note System.The clients runs the applications required to access

databases, using functionality of a web browser. A major distinction with browsers, however, is thatusers are excepted not only to read from databases, butalso modify them.

Lotus notes provide separate suite of tools that allowsusers to design and maintain their own databases.


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Lotus notes servers are known as Domino server .Domino server manages its associated collection of databases.The main task is to provide (remote) clients and other serversaccess to these databases.The main server program consists of modules for listening forrequesting coming in over the network, maintainingconnections and sessions to remote processes, and maintaininginformation on opened local databases.The numerous other tasks the relate to database managementand which often run as separate programs on the servermachine.


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Clients, servers and databases are glued together through a

separate middleware components known as the NOS.

This middleware implements a layer on top of underlying OSand networks that allows clients and servers to communicate

and access local and shared databases.

Its consists of components for RPC, storage facilities, callback functionality.


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The key data element in a Lotus Notes is formed by a note.

An item is the element for storing data associated with a note.

A data note comparable to a web document, such as video,

audio, images, plain text, icons.

There are four types notesData notesDesign notes Administration notes


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Note typeNote type CategoryCategory DescriptionDescription

DocumentDocument DataData A user-oriented document such as a Web pageA user-oriented document such as a Web page

FormForm DesignDesign Structure for creating, editing, and viewing aStructure for creating, editing, and viewing adocumentdocument

FieldField DesignDesign Defines a field shared between a form andDefines a field shared between a form andsubformssubforms

ViewView DesignDesign Structure for displaying a collection of documentsStructure for displaying a collection of documents

ACLACL

AdministrationAdministration

Contains an access control list for the databaseContains an access control list for the database

ReplFormulaReplFormula AdministrationAdministration Describes the replication of the databaseDescribes the replication of the database

Examples of different types of notes


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Lotus Notes uses an underlying RPC system for allcommunication between clients and servers.

The notes RPC system is mostly transparent to all clients and isactually internal to the NOS middleware layer.

Notes provides portable interprocess communication facilitiesfor exchanging information between processes running on thesame machine.

The notes subsystem formed for handling e-mail, its alwayssent mail messages MIME format.

To facilitate the development of high-level applications such as workflow systems.


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Server side software consists of a main programs with a number of built in tasks such as those forhandling in coming requests, opening & closinglocal database keeping databases consistent and

managing cluster of servers. Additional server tasks.Main server + server task=Domino server.

Communication between processes of a Dominoserver takes place using of NOS layer.Domino server can be grouped together intocluster.


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The general organization of a Domino server.


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Key role in replication is played by connectiondocuments.Connection documents are special notes

contained in domain directory that describedexactly when, how and what to replicate.Replicator SchemesPull-pushPull-pullPush-only Pull-only


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Replication schemes in Notes.

Scheme Description

Pull-push A replicator task pulls updates in from a target server, and pushesits own updates to that target as well

Pull-pull A replicator task pulls in updates from a target server, and respondsto update fetch requests from that target

Push-only A replicator task only pushes its own updates to a target server, butdoes not pull in any updates from the target

Pull-only A replicator only pulls in updates from a target server, but does notpush any of its own updates to that target


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Safely merging two documents with conflicting OIDs.

Write-write conflict occurs.


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Write head log method is used to prevent faults.Security Notes relies on the Authentication system. Authentication Validating certificates

Private key Public key


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Part Description

Servers ACL's specifying access rights for servers and ports

Workstations Lists specifying execution rights for scripts and such

Databases ACLs specifying permissions for different types of users

Files ACLs used for controlling access by Web clients

Design notes ACLs to control the presentation and such of documents

Documents ACL's to control read and write access to documents


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-Distributed systems principles and ParadigmsANDREW S. TANENBAM MAARTEN VAN STEEN.

-LOTUS www.ibm.com-www.domino.cs.vu.nl
http://www.ibm.com/http://www.ibm.com/