Solution : https://service.sap.com/sap/support/notes/79191 (SAP Service marketplace login required)
Key words :
alter table <table> drop constraint <primary_key_constraint_name>, subsequent create index greatly contributes, informix database server onconfig file, numberof configured cpu vps, 2k page size = 32 gb, 4k page size = 64 gb, user-defined page size, primary key constraint entry, system displays missing indexes, create unique index <primary_key_constraint_name>
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