Solution : https://service.sap.com/sap/support/notes/376905 (SAP Service marketplace login required)
Key words :
file $oracle_home/dbs/init<sid>, symptom long parsing times, status library cache lock, terms library cache lock, -called 'sort merge joins', row cache object, _improved_row_length_enabled = falseand restart, adversely affect support, -called '_' parameter, oracle 64 bit release
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