CPU overhead using Datacom table encryption

Products

• Datacom/DB
• Datacom
• DATACOM - AD
• Datacom/AD

Issue/Introduction

How much will CPU overhead increase when applying encryption to an existing Datacom DB or table?

Does it increase the disk usage?

Environment

Release: 15.1

Resolution

Encryption does not increase the disk usage.
The CPU overhead of encryption is very low, it estimated to be no more than 3%. 
Datacom uses the encryption method provided by the processor hardware of Z10 or later.
See documentation section Data Encryption

Another option for encrypting datasets is to convert the database files to VSAM Linear Datasets.
You can then use IBM's Pervasive Encryption. See section VSAM Linear Datasets with Media Manager.