Solution : https://service.sap.com/sap/support/notes/617679 (SAP Service marketplace login required)
Key words :
sqlplus <sap_user>/<password>set long 60select column_name, alter table <table_name> modify constraint <constraint_name> validate, sqlplus <sap_user>/<password>select column_name, database returns seemingly incomplete results, update <table_name> set <column> = <default>, alter table <table_name> modify, alter table command fails, resource intensive conversion, create unique indexes, longer consistent due
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