Oracle recommends removing all hidden parameters prior to upgrading
As part of running the utlu112i_5.sql script it states that 'Oracle recommends removing all hidden parameters prior to upgrading'. I am upgrading our 10.2.0.3 database to 11.2.0.3 and it has the "_awr_flush_threshold_metrics=TRUE" underscore parameter set. How do I remove it and do I need to put it back. Thanks in advance