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I have perform some test with relatively small tables and the encryption took a very long time (maybe because there are many SQL objects that are referring the target table).

I am wondering(worrying) when a table is being encrypted, is it possible to read the encrypted data or query the table? I only found this:

While the data is being re-encrypted, your applications cannot write to the impacted tables. Therefore, your organization needs to plan a column encryption key rotation very carefully.

and it is about the rotation.

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Column encryption key rotation will probably block since it is doing mass updates from a client across a network. We learned to absolutely lock users out of the system while a column is being encrypted with a new CEK.

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