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Question regarding taking cold backup prior to switching to archivelog mode versus waiting until arc

edited Oct 28, 2013 9:34AM in Database Backup and Recovery (MOSC) 4 commentsAnswered

I am new to a client whereby the databases have been unmanaged. 

RMAN catalog hasn't been installed yet on the client's server.

I haven't yet validated the integrity of all of the Oracle software on the client's server.

Client has a "production" decision support Oracle 10G R2 db over 12 TB in size running in NoArchiveLog mode.  Data is periodically refreshed.

I plan on switching the db to archivelog mode.  Prior to the switch  to archive log mode I am planning to perform expdp with full='y' and probably flashback_time=to_timestamp\(sysdate\ during off-peak hours. 

I am not sure how long the actual backup may take or how to predict how long an offline backup would take. 

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