Solution : https://service.sap.com/sap/support/notes/848708 (SAP Service marketplace login required)
Key words : 
update database statistics outdated database statistics, 25/jan/2006 database parameters oracle 9i transfer, regularly update database statistics, error-free database operation, pool size parameter values, oracle database parameter values, ] hash_join_enabled true pga_aggregate_target >= 300 mb [, oracle performance issues including, sap/oracle customer systems, oracle database statistics
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