ORA-01668: standby database requires DROP option for offline of data file

Cause: Attempting to take a datafile offline in a standby database without specifying the DROP option. Files that are offline in a standby database are not recovered, and are likely to be unusable if the standby is activated. Note that specifying DROP does not prevent bringing the file online later.

Action: Specify the DROP option or leave the file online.

Error Type: ORA

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