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.