Estimate time to enable all constraints and create all indexes

Hi,
To prepare a project to export/import for a whole database,
How can I estimate time required to enable all constraints and create all indexes
* Assume one full table scan per one FK constraint
* Assume one full table scan plus one sort/merge operation per one index
* Check it out whether we can use parallel DDL feature to speed up enabling of FK constraints
how can I use core schema (which will be exp/imp) in the production db to get needed metric for the calcualtion?
thanks
Jerry

There is no definative way to find the time it takes to enable a constraint / create a Index
It toatally depends on the Size of the table / execution plan / resources available (In terms of CPU and Physical Memory ) /
Amount of Temporary tablespace

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Estimate time to enable all constraints and create all indexes

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