'Data Guard and Oracle Real Application Clusters' and Oracle. Many different architectures using Oracle RAC and Data Guard are possible.

• Oracle Dataguard Replication
• Oracle Dataguard Types

Everything - absolutely everything. Besides the fact that they are both part of High Availability - they are night and day different. RAC provides for high availability (and scalability) 'in a room'. You have two or more computers sharing a common set of disk. All of the computers have read write access to the data in the single (one) database. Users are logged into the database using every computer that you have hooked together into this cluster.

We offer world class Oracle RAC, ASM and Data Guard training at an affordable price of 799. With $ $799, you get approximately 40 hours of quality instruction (and. Data Guard 11g Installation and Configuration On Oracle RAC Systems An Oracle White Paper October 2008 Maximum Availability Architecture Oracle Best Practices For.

If one computer (node) fails in the cluster - work continues as before - the database never goes down. You have less CPU's perhaps during this time, but the database continues running. This protects from system failures, hardware failures, and many software failures (instance failure, OS panic, whatever). Data Guard however provides for continuity of operations - if the room in which your RAC cluster resides 'goes away' (fire, flood, explosion, whatever) data guard is 'somewhere else, ready to take over'. Data Guard is primarily about failureover in the event of a catastrophic loss of the primary site. Data Guard provides other features as well - such as the ability to run in a delayed apply mode - so if you 'accidently' truncate a table in production (human error) - you can get the data back from your data guard database, instead of backups.

You can offload your backups to the data guard site, you can use the data guard site for readonly reporting if you want. But primarily - data guard is about having a fail over site sitting there read to go in the event of something really bad happening to the primary site. And you rated our response. Hi, I am in process of setting up physical standby database on 9.2. I want to log shipping from LGWR, and I want database protection mode should be maximum availability.

So in logarchivedest2 of primary database I have set following parameters SQLshow parameters logarchivedest2 logarchivedest2 string SERVICE=stndby LGWR SYNC AFFIRM So I belive whatever I do changes should 'shipped' to standby site by redo data. ( I have created standb redo logs on standby database ) But on primary database if I do changes in tables and commit, These changes are not getting applied to standby database after I open it as read only. In alerts ( production + standby ) it does not show me anything wrong. On standby site it shows me logarchivedest1 it shows me ora-00354 corrupt redo block header My questions regarding this Q1/ How do I correct this error?

Q2/ If I setup log shipping thru LGWR SYNC AFFIRM how logs will get applied to standby? If I do changes in table on primary ( very small change ) and if I open standby database can I see changes immediately? ( assume that there is no network issue ) am I correct?

Thanks & regards PJP.

Oracle Dataguard Replication

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