Solution : https://service.sap.com/sap/support/notes/143956 (SAP Service marketplace login required)
Key words :
process [tab=zzzz] [id=1111] [reason=thresh], additional key words sapdba, sapdba update statistics runtime, 5a sapdba-updstat, sapdba flag '-xxl', update statistics high, update statistics low, informix onconfig parameter, informix system table, tab done17
Related Notes :
184760 | Update Statistics: SAPDBA Rel.>=4.6A old strategy |
12184 | Improved performance with 'UPDATE STATISTICS' |