Re: Database Encryption

From: Stefan Koehler <>
Date: Thu, 7 Jun 2018 09:27:37 +0200 (CEST)
Message-ID: <>

Hello Arun,
two things came to my mind.

  1. CPU increase due to execution plan change You can have execution plan changes as you had to move (e.g. with dbms_redefinition) the data to encrypt it after enabling TDE and this can lead to a CPU increase.
  2. CPU type Your current used CPU type does not support hardware cryptographic acceleration or you are using TDE column encryption. For more details please check this white paper on page 3:

P.S.: Despite all that there may be cases where TDE really has a performance impact (had some nice discussion about that at Hotsos last year).

Best Regards
Stefan Koehler

Independent Oracle performance consultant and researcher Website:
Twitter: _at_OracleSK

> Arun Chugh <> hat am 7. Juni 2018 um 05:51 geschrieben:
> All, 
> We have encrypted almost all the datafiles of the database,  post that the performance of the database degraded to almost 40-50%
> Could anyone suggest what is the other alternative method that we can use in order to secure data with bit performance impact. 
> Regards, 
> Arun

Received on Thu Jun 07 2018 - 09:27:37 CEST

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