UPDATE: _rowsets_enabled in Oracle Database 12c

Please find a recent update here: _rowsets_enabled – Apply patch and use the default Last week I did post this entry with a strong recommendation to disable _rowsets_enabled in Oracle Database Nov 10, 2015: Switch off _rowsets_enabled in Oracle Database 12c Today I can give you an update, more insight information and better workarounds. Credits go to our DWH and Optimizer people (thanks to Hermann, Angela, Nigel and Mohammed). When is the problem happening? When a hash join operation receives rowsets from its right input but then produces one row at a time as output. This explains why one … Continue reading UPDATE: _rowsets_enabled in Oracle Database 12c