ADVANCE REPLICATION

Oracle Coretech Surabaya (OCS) One Day SeminarSurabaya, August 30th 2008

AGENDA

• Introduction

• Master – View Replication

• Multimaster & Hybrid• Case 1 (Master – View with subset)

• Case 2 (Full Schema & Cross OS & DB)

• Troubleshoot

Overview Of Replication

User

Transaction

Site #1

Site #2

Database ReplicaDatabase

Replicate

Overview Of Replication

• Replication is the process of copying and maintaining database objects, such as tables,in multiple databases that make up a distributed database system.

Application

Replication typically apply for multiple site enterpise application.

Central – remote site application Autonomous remote sites Data integration consistency

Advance Replication Benefit

Oracle Advance Replication benefit: Failover Load Balancing (Site Autonomy) Interoperability (Can replicate data beetween

different platform) Enable Data Subsetting

Oracle HA Road MapIntegration

8i

High Availability (HA)

Oracle Streams Data Guard + SQL Apply (Logical Standby)

Basic readable standby database (Physical Standby - Redo Apply)

Data Guard + Fast-start failover + Reinstante

Active Data Guard

Basic Replication

Advanced Replication

9i

10g

11g

Prerequites Knowledge

Oracle Database Administrator (DBA) I : …6. Database User Account :7. Managing Schema Object :

– Table– Index– View– ….

11. Configuring Oracle Network Env.

Materialized View (MV)

• View = stored select … query

• MView = View which is materialized from a single point of time = snapshot table

SNAPSHOT MATERIALIZED VIEW

9i 10g 11g7.0 – 7.3 8i8.0

Create Materialized View

Updatable View :CREATE VIEW HR.V_COUNTRIES AS

select * from hr.countries;

Read Only MV :CREATE MATERIALIZED VIEW HR. MV_COUNTRIES AS

select * from hr.countries;

Create Materialized View (2)

Read Only View :CREATE VIEW HR.V_COUNTRIES2 AS

select * from hr.countries WITH READ ONLY;

Updatable MV :CREATE MATERIALIZED VIEW HR. MV_COUNTRIES2 FOR UPDATE AS

select * from hr.countries;

View Vs MVSQL> Select TNAME, TAB from tab like '%COUNTRIES';TNAME TAB================ =====COUNTRIES TABLEMV_COUNTRIES TABLEV_COUNTRIES VIEW

SQL> select MVIEW_NAME, UPDATABLE from user_mviews;MVIEW_NAME U

==================== =MV_COUNTRIES NMV_COUNTRIES2 Y

Refresh

• Refresh Type Complete Fast Force

• Refresh Method Primary Key Row ID

Refresh

• Refresh Interval on demand on commit automatically on never

Database LinkPrivate & Fixed UserCREATE DATABASE LINK hr.target_db CONNECT TO hr IDENTIFIED BY hr123 USING net_target;

Public & Connected UserCREATE DATABASE LINK PUBLIC target_db USING net_target;

Current UserCREATE DATABASE LINK target_db CONNECT TO CURRENT_USER USING net_target;

Materialized View Log

CREATE MATERIALIZED VIEW LOG ON

Hr.countries WITH PRIMARY KEY (country_id)

Refresh Group

EXEC DBMS_REFRESH.MAKE

('group1', ‘mv_countries', SYSDATE, 'next_day(trunc(sysdate), '/*1:Hrs*/ sysdate + 1/24', FALSE, TRUE);

Advance Replication Type

• Materialized View Replication

(Master – View )

• Multimaster Replication

• Hybrid

Materialized View(Master – View)

MasterSite

Materialized ViewSite

Multimaster• peer-to-peer or n-way replication• equally participating in an update-anywhere model

MasterSite

MasterSite

MasterSite

Replication group

Replication group

Replication group

tables

tables

tables

orcl.site1

orcl.site2 prod.site3

Hybrid

MasterSite

MasterSite

MasterSite

MviewSite

Master – View

MasterSite

Materialized ViewSite

tables

mview

Master Group

mview log

mview Group

Database link

Database link

Step 1Master Site Setup

• Create replication user adminitrator

• Create materialized view user administrator

Step 2Master Site Group

• Create Master Site Group

Step 3Materialized view Log

• Define tables to replicate then create materialized view log

• Add to Master Site Group

Step 4Materialized View Site Setup

• Create materialized view user administrator

• Create Database link to master

Step 5Materialized View Group

• Create Materialized View Group

Step 6Materialized View

• Create Materialized View

• Add to Materialized View Group

Master – View using prebuilt table

MasterSite

Materialized ViewSite

tables

Prebuilt tables

Master Group

mview log

mview Group

Database link

Database link

ADVANCE REPLICATION