SQL> select * from v$version;

BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Release 10.2.0.4.0 - Production
CORE 10.2.0.4.0 Production
TNS for HPUX: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production

1) sys > alter system set "_smu_debug_mode"=33554432;
2) sys> alter system set "_undo_autotune"=false; 1) 2)合用才有效

select 'alter rollback segment '|| substr(SEGMENT_NAME, 2, 10)|| ' shrink;'
from dba_undo_extents where STATUS='EXPIRED' and rownum <50 order by bytes desc;

alter system set "_undo_autotune"=true; 等undo回收后

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How to Shrink Undo Segment In Oracle Database

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