Security Guide : 6. Using Data at Rest Encryption : Data at Rest Encryption Restrictions
 
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Data at Rest Encryption Restrictions
Restrictions for encrypting columns are as follows:
An encrypted column cannot be part of a table primary key.
Indexes are not allowed on encrypted tables.
The CALL VECTORWISE form of COMBINE and REWRITE does not work with encrypted tables. You must use the MODIFY...TO COMBINE and MODIFY...TO RECONSTRUCT statements.