Architecture Fro managment systems

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CHAPTER 1

Architecture Diagram

Update TransRead replica set

UpdateRef req Update trans update

Client

Refer req. Req.data transUpdate req.

Update transreq. data req. Update trans

data

Update Trans.

Client Refer Req Ref. reqUpdate Req New Data

UpdateReq

Fig 1:-System Architecture used in view Divergence control

1

Front -end Node

ClassifiedReplica

Mandatoryreplica

Minimumsubtree

Replica

Replica Local LogReplica

Receiver

Propagator

Replica

Replica

Propagato

r

ReceiverFront Node

Local Log


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CHAPTER 2

Implementation Detail

2.1 DATABASE DESIGN:-Data Model is the process of creating a logical representation of the structure of a

database. A data model is a model of users model of their business. It is the most important taskperformed by the developer- the entire database and application that access this database basedon it.

Two important models that are used in database design are - E-R Model and RelationalModel. In E-R model data is represented by entities, and relationship is defined between them.With Relational Model entities and relationship follow a strict guideline. Usually E-R model isdeveloped first, then it is transformed into Relational Model.

Entity-relationship model (ERM) is an abstract and conceptual representation of data.Entity-relationship modeling is a database modeling method, used to produce a type of

conceptual schema of a system, often a relational database, and its requirements in a top-downfashion. Diagrams created by this process are called entity-relationship diagrams, ERdiagrams.

In Bank database design there are four entities Bank-branch, account, customer andloan. Each Branch is identified by its unique branch no. There are many attribute associated witheach branch, like branch no, address, state etc. There many accounts at each branch. There is N:1relationship between account and branch. Each account entity is identified by its unique accountno. Account entity contains many more attribute like balance, opening date, closing date, interestrate, and type of account. Each account can be associated with one or more than one customer(joint account). A customer can have more than one account. So there is M:N relationshipbetween account and customer entity. There is one more relationship between account and

customer i.e transaction. Some attribute are also associated with the transaction relationship-transaction date, time and amount. One customer can take more than one loan at a time and oneloan can be issued to more than one customer, an organization, so there is M:N relationshipbetween customer and loan entity. One branch can issue more than one loan and one loan can beissued from only one branch, so there is 1:N relationship between branch and loan. Each loan isidentified by its unique loan no.

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2.1.1 ENTITY-RELATIONSHIP MODEL:-

N

N N

M 1

1

N

M

1N

N

3

loan

Accoun

t

CustomerBank-

Branch

BorrowLoans

Transaction

Accou

nts

d

Home

loan

Person

al loan

Education

al loan

Holds

dob

sex

add

r

phon

e

ema

il

name

Acc_

no

occu

p

Branch_

no

Addres

s

name

balan

ce type rateOpe

n

date

Close

date

Acc_n

o

Loan

no

typ

e

ROI

I_dat

eamou

nt

P_locat

ion

incom

e

L_tenu

reemi

duration

Inst.

addr

cours

eT_expen

ses

O_cotr

ib.


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2.2 DETAIL OF DATA SET USED:-

Table No - 1Table Name- CUSTOMER

Name Null? Type----------------------------------------- -------- ----------------------------CID NOT NULL VARCHAR2 (10)FNAME VARCHAR2 (15)MNAME VARCHAR2 (15)LNAME VARCHAR2 (15)

DOB DATEF_NAME VARCHAR2 (20)M_STATUS VARCHAR2 (10)ADD1 VARCHAR2 (30)ADD2 VARCHAR2 (30)CITY VARCHAR2 (15)P_CODE NUMBER (6)STATE VARCHAR2 (20)M_NO NUMBER (12)EMAIL VARCHAR2 (30)OCCUPATION VARCHAR2 (20)

RELIGION VARCHAR2 (20)GENDER VARCHAR2 (7)

Table No - 2Table Name - ACCOUNT

Name Null? Type----------------------------------------- -------- ----------------------------ACC_NO NOT NULL VARCHAR2 (15)CID VARCHAR2 (10)

BALANCE NUMBER (10)OPEN_DATE DATECLOSE_DATE DATEI_RATE NUMBER (5,2)TYPE VARCHAR2 (10)BRANCH_NO VARCHAR2 (10)

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Table No - 3Table Name - BRANCH

Name Null? Type----------------------------------------- -------- ----------------------------BRANCH_NO NOT NULL VARCHAR2 (10)B_ADDR1 VARCHAR2 (30)B_ADDR2 VARCHAR2 (30)

B_CITY VARCHAR2 (20)B_STATE VARCHAR2 (30)

Table No - 4Table Name - TRANSACTION

Name Null? Type----------------------------------------- -------- ----------------------------CID NOT NULL VARCHAR2 (10)ACC_NO NOT NULL VARCHAR2 (15)

T_DATE NOT NULL DATET_TIME NOT NULL VARCHAR2 (10)T_AMT NUMBER (8)T_TYPE VARCHAR2 (10)

Table No - 5Table Name - LOAN

Name Null? Type----------------------------------------- -------- ----------------------------

LOAN_NO NOT NULL VARCHAR2 (15)BRANCH_NO VARCHAR2 (10)LOAN_AMOUNT NUMBER (9)LOAN_TYPE VARCHAR2 (12)INTEREST VARCHAR2 (4)ISSUE_DATE DATE

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Table No - 6Table Name - HOME LOAN

Name Null? Type----------------------------------------- -------- ----------------------------LOAN_NO NOT NULL VARCHAR2 (15)PROPERTY_LOCATION VARCHAR2 (60)INCOME NUMBER (8)LOAN_TENURE NUMBER (2)EMI NUMBER (5)

Table No - 7Table Name - EDUCATION LOAN

Name Null? Type----------------------------------------- -------- ----------------------------LOAN_NO NOT NULL VARCHAR2 (15)COURSE VARCHAR2 (25)COURSE_DURATION NUMBER (2)INST_NAME VARCHAR2 (30)

ADDRESS VARCHAR2 (60)CITY VARCHAR2 (20)PIN NUMBER (6)STATE VARCHAR2 (20)TOTAL_EXPENSE NUMBER (8)OWN_EXPENSE NUMBER (8)

Table No - 8Table Name - LOAN HOLDER

Name Null? Type----------------------------------------- -------- ----------------------------CID NOT NULL VARCHAR2 (10)LOAN_NO NOT NULL VARCHAR2 (15)

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2.3 METHODOLOGIES USED FOR DATA VALIDATION:-JavaScript is used for validating the data taken at client site.

1) Name should only contain alphabet and space. Digit and special symbol are not allowed inname.

2) City should only contain alphabet and space.3) Phone only contain digit and + symbol is allowed.4) In email validation @ symbol are checked. Only one @ symbol should present. After @ atleast one . should be present. @ and . Must not be continuous.@ and . Should not be firstand last character.

2.4 PSEUDOCODE OF IMPLEMENTED ALGORITHM:-

2.4.1 Creating distributed environment:-

In this module ,distributed environment is created. If some data is not present at localdatabase, user can access that data from the remote database.On Windows, Oracle Net Manager Program is used to create a new net service entry intnsnames.ora file as follows:-

1. Start Oracle Net Manager by clicking the Start button and then selecting Programs,Oracle, Configuration and Migration Tools, and Net Manager.

2. From the Local tree, select Service Naming and click the plus (+) on the left hand side ofthe page. The Net Service Name Wizard appears.

3. Enter a net service name to identify it. The name will appear under the Service Namingfolder. Click Next.

4. Select the protocol to use to connect to database. For example, accept the default ofTCP/IP (Internet Protocol). The database listener must be configured to use the samenetwork protocol. Click Next.

5. Enter the host name of the database machine, such as coconuts.island.com, and the portnumber. Click Next.

6. Enter either the database service name or the database SID. In the Connection Type list,select Shared Server, Dedicated Server, or Database Default. Shared connections requiredatabase to be running in shared mode. If Dedicated is chosen, then the database

dedicates a single server process to serve connection.. Click Next.7. The last screen of the wizard enables us to test the connection by using the information

entered by us. To do so, Test button is clicked. The wizard tells us if the connection testsucceeds or not.

8. Click Finish. The new service appears under the Service Naming folder. We can view ormodify the configuration for the highlighted service in the Service Identification andAddress Configuration sections.

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Sample Input:-

Snapshot 1: taking the name to be used for remote service

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Snapshot 2: Protocol to be used for connecting remote service

Snapshot 3: IP address of the machine providing the service and the port at which service isrunning

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Snapshot 4: name of the service or database at remote machine

Sample Output:-

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Snapshot 5: Showing that remote service connecting successfully

# tnsnames.ora Network Configuration File:

ORC2 =

(DESCRIPTION =(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.56.101)(PORT = 1521))

)(CONNECT_DATA =(SERVICE_NAME = orc2)

))

ORCL =(DESCRIPTION =

(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = rvtech-1fe3e4e4)(PORT = 1521))

)(CONNECT_DATA =(SERVER = DEDICATED)

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(SERVICE_NAME = orcl))

)

EXTPROC_CONNECTION_DATA =(DESCRIPTION =

(ADDRESS_LIST =(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))

)(CONNECT_DATA =(SID = PLSExtProc)(PRESENTATION = RO)

)

)

2.4.2 MODULE 2(PROPAGATION OF UPDATE TRANSACTION):-

In this Module whenever client want to make updation at local database, receiver receivethe update transaction from client through GUI and update the local database and usingpropagator, propagate the update transaction at other site. At other site receiver receive theupdate transaction and update the database and again propagate the update transaction to othersite.

Propagator:-

package CLASS;

import java.net.*;

import java.io.*;

public class propagator {

public void register(customer cust,account acc){

Socket socket;

try{System.out.println("inside propagator");socket=new Socket("192.168.56.101",5001);System.out.println("connection established");ObjectOutputStream oos=new ObjectOutputStream(socket.getOutputStream());DataOutputStream dos=new DataOutputStream(socket.getOutputStream());dos.writeUTF("registration");

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oos.writeObject(cust);oos.writeObject(acc);socket.close();System.out.println("connection closed");

}

catch(Exception e){System.out.println(e);

}}

}

Receiver:-

package CLASS;

import java.io.*;import java.net.*;import java.sql.*;public class receiver {

public static void main(String arg[]){

try{

ServerSocket server=new ServerSocket(5000);while(true){

Socket socket=server.accept();Thread th=new receiver1(socket);th.start();}

}catch(Exception e){

System.out.println(e);}

}

}

class receiver1 extends Thread{

Socket socket;

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receiver1(Socket sc){

socket=sc;}@Override

public void run(){Connection cn=null;PreparedStatement st=null;try{

ObjectInputStream ois=new ObjectInputStream(socket.getInputStream());DataInputStream dis=new DataInputStream(socket.getInputStream());String str=dis.readUTF();Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");cn=DriverManager.getConnection("jdbc:odbc:amit","scott","tiger");st=cn.prepareStatement("alter session set NLS_DATE_FORMAT='dd-mm-yyyy'");

st.execute();

if(str.equals("registration")){

customer cust=(customer)ois.readObject();account acc=(account)ois.readObject();

st=cn.prepareStatement("insert into customervalues(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)");

st.setString(1,cust.cid);st.setString(2,cust.fname);st.setString(3,cust.mname);st.setString(4,cust.lname);st.setString(5,cust.dob);st.setString(6,cust.f_name);st.setString(7,cust.m_status);st.setString(8,cust.add1);st.setString(9,cust.add2);st.setString(10,cust.city);st.setString(11,cust.p_code);st.setString(12,cust.state);st.setString(13,cust.m_no);st.setString(14,cust.email);st.setString(15,cust.occupation);st.setString(16,cust.religion);st.setString(17,cust.gender);int r=st.executeUpdate();//System.out.println("no of row"+r);//cn.commit();if(r==1)

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{//System.out.println("inside account");// System.out.println("inside account0");st=cn.prepareStatement("insert into

account(acc_no,cid,balance,open_date,i_rate,type,branch_no) values(?,?,?,?,?,?,?)");

st.setString(1,acc.acc_no);st.setString(2,acc.cid);//System.out.println("inside account1");st.setString(3,Long.toString(acc.balance));// System.out.println("inside account2");st.setString(4,acc.open_date);//st.setString(5,null);st.setString(5,Float.toString(acc.i_rate));st.setString(6,acc.type);st.setString(7,acc.branch_no);int r1=st.executeUpdate();

if(r1==1){cn.commit();cn.close();

}else{

cn.rollback();cn.close();

}}

}}catch(Exception e){

System.out.println(e);}

}}

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Customer_servlet(receiver for registration done at local site):-

package servlet;

//import java.io.IOException;//import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;

import CLASS.*;import java.sql.*;

import java.io.*;import java.util.*;import javax.servlet.RequestDispatcher;

public class customer_servlet extends HttpServlet {

protected void processRequest(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {

response.setContentType("text/html;charset=UTF-8");PrintWriter out = response.getWriter();customer cust=new customer();cust.fname=request.getParameter("fname");cust.mname=request.getParameter("mname");cust.lname=request.getParameter("lname");cust.f_name=request.getParameter("f_name");String dobday=request.getParameter("dobday");String dobmonth=request.getParameter("dobmonth");String dobyear=request.getParameter("dobyear");cust.gender=request.getParameter("gender");cust.m_status=request.getParameter("m_status");cust.add1=request.getParameter("addr1");cust.add2=request.getParameter("addr2");cust.city=request.getParameter("city");cust.p_code=request.getParameter("pin");cust.state=request.getParameter("State");cust.m_no=request.getParameter("phone");cust.email=request.getParameter("email");cust.occupation=request.getParameter("occupation");

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cust.religion=request.getParameter("religion");String dob=dobday+"-"+dobmonth+"-"+dobyear;cust.dob=dob;Connection cn=null;PreparedStatement st=null;

try {Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");cn=DriverManager.getConnection("jdbc:odbc:amit","scott","tiger");st=cn.prepareStatement("alter session set NLS_DATE_FORMAT='dd-mm-yyyy'");st.execute();st=cn.prepareStatement("select max(cid) from customer");ResultSet rs=st.executeQuery();if(rs.next()){

cust.cid=rs.getString(1);long num=Long.parseLong(cust.cid);

num=num+1;cust.cid=Long.toString(num);}st=cn.prepareStatement("insert into customer values(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)");st.setString(1,cust.cid);st.setString(2,cust.fname);st.setString(3,cust.mname);st.setString(4,cust.lname);st.setString(5,dob);st.setString(6,cust.f_name);st.setString(7,cust.m_status);st.setString(8,cust.add1);st.setString(9,cust.add2);st.setString(10,cust.city);st.setString(11,cust.p_code);st.setString(12,cust.state);st.setString(13,cust.m_no);st.setString(14,cust.email);st.setString(15,cust.occupation);st.setString(16,cust.religion);st.setString(17,cust.gender);int r=st.executeUpdate();//System.out.println("no of row"+r);//cn.commit();if(r==1){

//System.out.println("inside account");account acc=new account();st=cn.prepareStatement("select acc_no from account where cid=(select max(cid) from

account)");

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rs=st.executeQuery();if(rs.next()){

acc.acc_no=rs.getString(1);Long num1=Long.parseLong(acc.acc_no);

num1=num1+1;acc.acc_no=Long.toString(num1);}acc.getvalue(acc.acc_no,cust.cid,"saving");

// System.out.println("inside account0");st=cn.prepareStatement("insert into

account(acc_no,cid,balance,open_date,i_rate,type,branch_no) values(?,?,?,?,?,?,?)");st.setString(1,acc.acc_no);st.setString(2,acc.cid);//System.out.println("inside account1");st.setString(3,Long.toString(acc.balance));

// System.out.println("inside account2");st.setString(4,acc.open_date);//st.setString(5,null);st.setString(5,Float.toString(acc.i_rate));st.setString(6,acc.type);st.setString(7,acc.branch_no);int r1=st.executeUpdate();if(r1==1){

cn.commit();cn.close();propagator pr=new propagator();System.out.println("prpagator created");pr.register(cust,acc);List data=new ArrayList();data.add(cust.fname);data.add(cust.mname);data.add(cust.lname);data.add(acc.acc_no);data.add(acc.balance);data.add(acc.type);request.setAttribute("data",data);RequestDispatcher dispatcher

=request.getRequestDispatcher("/registration_info.jsp");if(dispatcher!=null)

dispatcher.forward(request,response);

}

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else{


}

}else{


}

response.sendRedirect("home1.jsp");}catch(Exception e){

System.out.println(e);}finally {

out.close();}

}

protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {

processRequest(request, response);}

protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {

processRequest(request, response);}

}

Sample Input:-

New account creation page is used as output to this module. Client provide theinformation through GUI.

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Snapshot 6: Account registration form for taking input from client

Sample Output:-

Data is successfully updated to local database and propagated to all other remote site. Atremote site data is successfully updated into the database.

Snapshot 7: Displaying the info of the account after account creation

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2.4.3 Java script code for validation:-// Declaring required variablesvar digits = "0123456789";// non-digit characters which are allowed in phone numbersvar phoneNumberDelimiters = "()- ";

// characters which are allowed in international phone numbers// (a leading + is OK)var validWorldPhoneChars = phoneNumberDelimiters + "+";// Minimum no of digits in an international phone no.var minDigitsInIPhoneNumber = 10;var dtCh= "-";var minYear=1900;var maxYear=2100;var whitespace=" \t\n\r";validations = new Array();validations[0]=["document.form1.fname","notblank"];

validations[1]=["document.form1.fname","validname"];validations[2]=["document.form1.lname","notblank"];validations[3]=["document.form1.lname","validname"];validations[4]=["document.form1.mname","validname"];validations[5]=["document.form1.f_name","notblank"];validations[6]=["document.form1.f_name","validname"];validations[7]=["document.form1.addr1","notblank"];validations[8]=["document.form1.city","notblank"];validations[9]=["document.form1.city","validname"];validations[10]=["document.form1.pin","isNumber"];validations[11]=["document.form1.pin","validpin"];

validations[12]=["document.form1.phone","validphone"];validations[13]=["document.form1.email","validemail"];validations[14]=["document.form1.religion","notblank"];validations[15]=["document.form1.religion","validname"];function isEmpty(s){

var i;if(( s== null ) || ( s.length == 0 ))

return true;for(i=0 ; i < s.length ; i++){

var c= s.charAt(i);if(whitespace.indexOf(c)==-1)return false;

}return true;

}function isDigit(c){

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return((c>="0")&&(c


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alert("Invalid E-mail ID")return false

}

if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){

alert("Invalid E-mail ID")return false}

if (str.indexOf(dot,(lat+2))==-1){alert("Invalid E-mail ID")return false

}

if (str.indexOf(" ")!=-1){alert("Invalid E-mail ID")

return false}

return true}

function isInteger(s){var i;

for (i = 0; i < s.length; i++){// Check that current character is number.var c = s.charAt(i);if (((c < "0") || (c > "9"))) return false;

}// All characters are numbers.return true;

}

function stripCharsInBag(s, bag){var i;

var returnString = "";// Search through string's characters one by one.// If character is not in bag, append to returnString.for (i = 0; i < s.length; i++){

var c = s.charAt(i);if (bag.indexOf(c) == -1)

returnString += c;}return returnString;

}

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function trim(s){ var i;

var returnString = "";// Search through string's characters one by one.

// If character is not a whitespace, append to returnString.for (i = 0; i < s.length; i++){

// Check that current character isn't whitespace.var c = s.charAt(i);if (c != " ") returnString += c;

}return returnString;

}

function checkInternationalPhone(strPhone){

var bracket=3strPhone=trim(strPhone)if(strPhone.indexOf("+")>1) return falseif(strPhone.indexOf("-")!=-1)bracket=bracket+1if(strPhone.indexOf("(")!=-1 && strPhone.indexOf("(")>bracket)return falsevar brchr=strPhone.indexOf("(")if(strPhone.indexOf("(")!=-1 && strPhone.charAt(brchr+2)!=")")return falseif(strPhone.indexOf("(")==-1 && strPhone.indexOf(")")!=-1)return falses=stripCharsInBag(strPhone,validWorldPhoneChars);return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);}function special(data){var iChars = "!@#$%^&*()+=-[]\\\';,./{}|\":?~_";for (var i = 0; i < data.length; i++) {

if (iChars.indexOf(data.charAt(i)) != -1) {alert ("Your string has special characters. \nThese are not allowed.");

return true;}

}return false;

}function namecheck(s){

var i;if( !special(s) ){

for(i=0 ; i < s.length ; i++ )

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{var c = s.charAt(i);if(isDigit(c)){

alert("name will not contain digit");

return false;}}return true;

}else

return false;}function validateForm(){

var i;var checkToMake;var field;for(i=0 ; i < validations.length ; i++){

checkToMake=validations[i][1];field=eval(validations[i][0]);switch(checkToMake){case 'notblank':

if(isEmpty(field.value)){

alert(field.name+" may not be empty");field.focus();return false;

}break;

case 'validname':if(!namecheck(field.value)){

field.value="";field.focus();

return false;}

break;case 'isNumber':

if(!isinteger(field))return false;

break;

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case 'validemail':if (echeck(field.value)==false){

field.value=""field.focus()

return false}break;

case 'validpin':

if(field.value.length


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2.6 TESTING OF IMPLEMENTED MODULE:-

Test Case No 1

Description Checking of creation of distributed environment

Sample Input Ip address of remote site is used in ping command

Expected Output Received packet=4 and sent packet=4

Original result Packet sent=4 received=0

Comment Host is not able to connect to the remote site

Corrective Measure Change the ip address of Bridge gateway

Test Case No 2


Sample Input create a table at remote site and insert some data into the

table

Expected Output Table and data can be access from the local site

Original result Ora-12560:TNS Protocol Adopter error

Comment User is not able to login to remote database becauselistener is not listening on the specified port

Corrective Measure Check the listener.ora file and configure it properlyAnd start the listener at remote site

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Test Case No 3


Sample Input create a table at remote site and insert some data into thetable

Expected Output Table and data can be access from the local site

Original result Local user is accessing the remote database using thepublic link.

Comment Expected result is obtained. This module is workingproperly,

Test Case No 4

Description Only authorized user can login.

Sample Input Tested with some valid and in-valid username andpassword

Expected Output Only valid user can login.

Comment Expected result is obtained. This is working properly,

Test Case No 5

Description All data is correctly received by the receiver at local sitefrom the client through and it correctly updated in thelocal database.

Sample Input New account creation page is used for this purpose.Many account is created using this page.

Expected Output Data is successfully updated into the database.

Original result Data is successfully inserted into the database.

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Comment Expected result is obtained. Data is successfully insertedinto the database.

Test Case No 6

Description Update transaction is successfully propagated to remotesite using propagator module.

Sample Input Data received by receiver is made available to thepropagator as input. Receiver is already tested.

Expected Output Update transaction is received by receiver at remote site.

Original result Bind error

Comment Port is already used by any other application or previous

socket.Corrective Measure Thread is used for each new connection

Test Case No 7

Description Update transaction is successfully propagated to remotesite using propagator module.

Sample Input Data received by receiver is made available to thepropagator as input. Receiver is already tested.

Expected Output Update transaction is received by receiver at remote site.

Original result Update transaction is successfully received by receiverat remote, which also updated the remote database.

Comment Expected result is obtained. Update transaction is

successfully received by receiver at remote ,which alsoupdated the remote database.

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Test Case No 8

Description At the time of new account creation , data should beinserted in both account and customer table. Otherwise

rollback if inserted in only one table

Sample Input 1)All valid data needed is provided to the receiver 2)some changes is made in code ,so that integrityconstraint is violated in account table

Expected Output Data is inserted in both table or rollback.

Original result Data is inserted in both table or not in any table.

Comment Expected result is obtained. This module is working

properly,

2.7 DETAIL OF MODULE TO BE COMPLETED:-

2.7.1 MODULE IV (DATA RETRIVAL FROM REPLICA NODE)-

In this module first read replica set is calculated. Data isretrieved from the node which is in read replica set and they are compare to find the latest data. Ifthat data is not present in the local database, then local database is updated and fresh data ismade available to the client. This module has three sub-module:-

a) Classified replica determination:- In this module ROS of adjacent replica is compared tofind the classified replica.

b) Mandatory replica determination:- In this mandatory replica is identified, which willbecome the read replica.

c) Minimum sub tree determination: - In this module tree is created for next iteration.

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