Solution : https://service.sap.com/sap/support/notes/414213 (SAP Service marketplace login required)
Key words :
prerequisites index afko_3 defines fields mandt, system generates long runtimes, notes%_hints oracle 'rule', field names aufnt mandtkeep, project system ps, oracle hint possibly, short description index, -unique index' choose ', full table scan, selected database systems'
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| 322284 | Bad performance because of access to VALLC |