Re: ORA-1555 error with AUM already enabled

> Try again with a guaranteed retention (alter tablespace <undo> 
> retention guarantee) ... 
> you may run into "unable to extend segment" errors in the Undo 
> tablespace.

If OP is doing the traditional export, the little used option 
resumable can be set to Y to prevent abort on space-related errors.

If it's expdp, there's no such parameter because expdp does it 
automatically, and shows on screen "ORA-39171: Job is experiencing 
a resumable wait" (except during the final index creation phase). 
Also gone with expdp is resumable_timeout so it gives you only 
2 hours' time to respond. But I think you can create a logon 
trigger for the user doing expdp to set it.

Yong Huang


      
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