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The REVERT/MERGE operation must be done bottom-up, to minimise the number of sessions kept.

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Reconfiguring from databases to files must be done top-down.

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Reconfiguring back from files to databases must also be done top-down, and you must complete the reconfiguration for the whole extract. For example, if you reconfigure all three database levels of a three level extract to files but only reconfigure the top two file levels back to databases, the third database will be corrupted due to the reconfiguration of the other two. Refer to Example of Reconfiguring a Three Level Extract for further information.

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Before reconfiguring in from a file, the extract must be refreshed from its parent.