1 All Powder Board and Ski Oracle 9i Workbook Chapter 10: Distributed Databases Jerry Post Copyright © 2003

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All Powder Board and Ski

Oracle 9i WorkbookChapter 10: Distributed DatabasesJerry PostCopyright © 2003

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All Powder LAN

Offices/Managers

Checkout

Rental Desk

Network Switch

Server

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Create Target Database and Table

Create a new database if necessary:Start/All Programs/Oracle-OraHome92/Configuration and Migration Tools/ Database Configuration AssistantUse Net Manager to add a hostname entryLog in and create a new user/schema or use the system schemaCreate a small table

CREATE TABLE Customer( CustomerID INTEGER, LastName VARCHAR2(15), FirstName VARCHAR2(15), Constraint pk_Customer Primary Key (CustomerID));INSERT INTO Customer (CustomerID, LastName, FirstName) Values (1,'Smith', 'Adam');INSERT INTO Customer (CustomerID, LastName, FirstName) Values (2,'Keynes', 'John');INSERT INTO Customer (CustomerID, LastName, FirstName) Values (3,'Samuelson', 'Paul');INSERT INTO Customer (CustomerID, LastName, FirstName) Values (4,'Robinson', 'Joan');Commit;

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Link to Target Database

CREATE DATABASE LINK NewYork CONNECT TO RemoteUser IDENTIFIED BY t1 USING 'dbhostname';

SELECT * FROM Customer@NewYork;

Create a descriptive name for the link

User account and password on the target databaseDatabase hostname

in the network file

Table name@link name

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Database Replicas

Master Site

Materialized View (Replica)



Replication Group

Deployment Template

Link Schedule

Synchronize

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Create a Materialized View Replica

1. Start the Deployment Template1. Set up Master Sites2. Disconnect and log in as RepAdmin3. Create a Master Group4. Create the Template5. Generate the script

2. Create Materialized View logs on the master site for each table3. On the client, or build as PL/SQL to add to the script

1. Manually create a Materialized View Group creating a new Refresh Group matching name from template: CustomerTemplate

2. Select the Customer materialized view (or all)3. Add the materialized view to the refresh group

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Creating Replicas: Deployment Template-Master Site

Add the main database

Log in as SYSDBA

Open Advanced Replication and follow menu options

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Replica: Deployment: Master Group

Objects tab

Select Customer table

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Template: Create Views

Create template

Select tables

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Generate Template: Schema

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Create Materialized View

CREATE MATERIALIZED VIEW Powder.Customer FOR UPDATE ASSELECT * FROM Powder.Customer@host_database_link;

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Client Side MV and Refresh Group

Create refresh group

Add materialized views

Refresh

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PL/SQL on Web Pages

(0) Configure the Data Access Descriptor (DAD)

(1) Create the basic html form to get the SaleID GetSale.psp

(2) Create the page to display the results ListSales.psp

(3) loadpsp -replace -user powder/ski1@PostDB GetSale.psp

(4) loadpsp -replace -user powder/ski1@PostDB ListSales.psp

(5) http://PostDB/pls/simpledad/Powder.GetSale

Pages without Java Pages are stored as procedures within the database and use embedded PL/SQL to connect to the database

Two page example to enter a SaleID and lookup the matching data

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Configure DAD

http://server

Pick: Mod plsql Configuration Menu

Modify the SimpleDAD, or create a new one

Schema Name: Powder

UserName: Powder

Password:

Connect String: PostDB

Authentication Mode: Basic

Leave the other defaults

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GetSale.psp Form Page

<html><head><title>Get SaleID</title></head><body><p align=center>All Powder Board and Ski Shop Sales</p><form name='Form1' method='post' action='Powder.ListSales'><p>Enter a Sale ID value: <input type='text' name='SaleID' maxlength='20' /></p><input type='submit' name='submit' value='Submit' /></form></body></html>

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ListSales.psp Display Page

<%@ page language="PL/SQL" %><%@ plsql procedure="ListSales" %><%@ plsql parameter="SaleID" type="NUMBER" %><%! l_SaleID NUMBER := SaleID;%><HTML><HEAD><TITLE>List Sales Data</TITLE></HEAD><BODY><p>Sales data for SaleID: <%=SaleID%></p><table border=0><tr><th>Sale ID</th><th>Sale Date</th><th>CustomerID</th></tr><%

for item in (select * from sale where SaleID=l_SaleID order by SaleDate) loop%>

<tr> <td><%=item.SaleID%></td><td><%=item.SaleDate%></td>

<td><%=item.CustomerID%></td></tr>

<% end loop; %></table></BODY></HTML>

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Load Pages Into Oracle

(3) loadpsp -replace -user powder/ski1@PostDB GetSale.psp

(4) loadpsp -replace -user powder/ski1@PostDB ListSales.psp

Go to the command line (DOS)

You must include the database name

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Open the First Page in a Browser

http://PostDB/pls/simpledad/powder.getsale

The URL is very picky and must be complete (regardless of what the documentation says). And watch the dot!

http://WebServer/pls/DADName/Schema.Procedure

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Results

The example is simple to highlight the steps.You can retrieve more rows.You can use a better format.

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Create XML File with SQL

SET long 20000SET pages 100SPOOL D:\Students\AllPowder\Employee10.xmlSELECT XMLElement("Employee", XMLElement("LastName", LastName),

XMLElement("FirstName", FirstName))FROM EmployeeWHERE rownum<10;

SPOOL OFF

Eliminate line and page breaks

Send output to a file

Limit data to 9 rows to keep the file smaller for now

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XML File: Cleaned Up

<?xml version='1.0'?><Employees><Employee>

<LastName>Staff</LastName><FirstName></FirstName>

</Employee><Employee>

<LastName>Killy</LastName><FirstName>Jean-Claude</FirstName>

</Employee>…</Employees>

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XML File in Internet Explorer

Documents

1 All Powder Board and Ski Oracle 9i Workbook Chapter 10: Distributed Databases Jerry Post Copyright © 2003