Add PK constraint to a Unique Index via updating system catalogs?

[CS DBA <cs_dba@xxxxxxxxxxxxxxxxxxx>]

Hi All;

We have a few very large tables with unique indexes on a column but the 
column is not defined as the Primary Key.  Can we add a PK constraint 
via updates to the system catalogs so we can avoid the lengthy checks 
that would take place if we ran "alter table add constraint primary key...."


Thanks in advance





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