12.2 : no access during security operation

Hello,

For security measures, we would like to apply a data anonymization script just after each refresh of the data via an import datapump.

Anonymization is done by a script for the modification of sensitive data.

UPDATE SET col1 = ‘xxxx’ WHERE…;

We would like that from the import phase and until the end of the application of the post-import anonymization script no user can access the database.

Do you have an idea ?

Thank you.

GD.