Welcome to Oracle Disaster Recovery Section. I have designed and implemented several DR solutions for mission critical 24x7 databases, both oracle and others (SQL Server, DB2, Sybase). I have created a DBA Handbook for Oracle 9i/10g Data Guard Implementations on AIX p-series, which you will find in the pages below.

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Oracle 9i/10g Data Guard Handbook - With Practical Example 

I have implemented several DataGuard solutions on AIX and HP platforms. DataGuard is mainly for Disaster Recovery Solution, however once you master the technology, you can use this Oracle Product for other purposes as well. For example it can be used to Upgrade mission critical 24x7 9i Databases to 10g with almost Zero down time. You can use Data Guard as High Availability solution within the same Data Center instead of clustering, however this should be a temporary solution until you implement RAC.

Click here to Read or Download DataGuard DBA Handbook.