Solution : https://service.sap.com/sap/support/notes/140374 (SAP Service marketplace login required)
Key words : 
log   activity_capture        2   activity_dbname         ispy   activity_informixserver us0031biwshm   activity_dir            /informix/i-spy/activity   activity_id             0   phase connect   phase dbopen   phase activity 4, us0031biwshm  onipcshm  us0031 sapinfbiw   us0031biwtcp  ontlitcp  us0031 sapinfbiw   us0031spytcp  ontlitcp  us0031 sapinfspy 2, i-spy environment parameter  ispy_dir=/informix/i-spy  ispyserver=us0031biwtcp  ispy_configfile=/informix/i-spy/, shadowserver us0031spytcp   ispyserver   us0031biwtcp   explaintags  1   logname      /informix/i-spy/log/ispy, sap bw datawarehouse queries additional key words sap bw, 'chmod 755 /usr/sap/<sid>/dvebm [0-9][0-9]/work' nt, \usr\sap\<sid>\dvebm [0-9][0-9]\work' solution install, /usr/sap/<sid>/dvebm [0-9][0-9]/work directory, sap bw infocube star schema queries, i-spy parameter 'activity_capture'
Related Notes : 
       
| 156319 | Collective note performance BW 1.2B |