Solution : https://service.sap.com/sap/support/notes/632556 (SAP Service marketplace login required)
Key words : 
log_checkpoint_interval 0 log_archive_start true log_buffer 1048576 log_checkpoint_timeout 0 log_checkpoints_to_alert true max_dump_file_size 20000 open_cursors 800 optimizer_features_enable 9, 0 optimizer_mode choose parallel_execution_message_size 16384 parallel_max_servers #db-cpu-cores 10 optimizer_max_permutations 2000 parallel_threads_per_cpu 1 pga_aggregate_target 40%, timed_statistics true transaction_auditing false workarea_size_policy auto _b_tree_bitmap_plans false _eliminate_common_subexpr false, shared_pool_size sessions >= processes star_transformation_enabled true statistics_level basic, numerous sap/oracle customer systems, consecutive rows filesystemio_options setall, recommendation ------------------------------- ------------------------------------- compatible current release, db_block_size 8192 db_cache_size size depends, hash_join_enabled true java_pool_size 0, _optim_peek_user_binds false _pga_max_size
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