Solution : https://service.sap.com/sap/support/notes/423726 (SAP Service marketplace login required)
Key words : 
alter table            copy dbdb2slib, exchange upgrade tools               start, 'create tablespace/index' statements, set environment variable dbs_db2_use_define_no, r3up version <rel> upgrade, 'create index' statements, downward-compatible version 6, dbs_db2_use_define_no = 1               make usre, identify empty tables, user <sid>adm
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