30036故障解决方法案例(4)

With this setting, v$undostat.tuned_undoretention is not calculated based on a percentage of the undo tablespace size, instead v$undostat.tuned_undoretention is set to the maximum of (maxquerylen secs + 300) undo_retention specified in init.ora file.

2.) Set the following hidden parameter in init.ora file:
_smu_debug_mode=33554432

or

SQL> Alter system set "_smu_debug_mode" = 33554432;