Solution : https://service.sap.com/sap/support/notes/1004920 (SAP Service marketplace login required)
Key words : 
/    newmar/28/2007   ii/    newmar/28/2007   iii/   newjul/05/2007     iv/    newaug/14/2007   ii/    changeddec/14/2007, vii/ dropped table recoverychronological summary======================date            topic      type, /     newdec/17/2008    vi/   newmar/11/2009   vii/   newnov/18/2009   viii/  newmay/25/2010, alter tablespace <tbspace_name> dropped table recovery offfor, 'parconv_upg' 'pscrgen_drop_shd_tab' 'shadow_import_inc' 'altntab_fill' 'xpras_upg', command db2 activate database <dbname>, vii/ dropped table recovery, dropped table recovery attribute, disable dropped table recovery, 'automatic'ii/ manual postprocessing
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