Oracle "shrink" undo tablespace
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Authored by stwalkerster on Dec 28 2017, 11:03 PM.

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	CREATE UNDO TABLESPACE UNDOTBS2 DATAFILE '/u01/app/oracle/oradata/XE/UNDOTBS2_1.dbf' SIZE 10485760;

	ALTER SYSTEM SET UNDO_TABLESPACE=UNDOTBS2 SCOPE=BOTH;

	-- kill all sessions

	-- wait for value of undo_retention (default 900)

	DROP TABLESPACE UNDOTBS1 INCLUDING CONTENTS AND DATAFILES;

	CREATE UNDO TABLESPACE UNDOTBS1 DATAFILE '/u01/app/oracle/oradata/XE/UNDOTBS1.dbf' SIZE 10485760;

	ALTER SYSTEM SET UNDO_TABLESPACE=UNDOTBS1 SCOPE=BOTH;

	-- kill all sessions

	-- wait for value of undo_retention (default 900)

	DROP TABLESPACE UNDOTBS2 INCLUDING CONTENTS AND DATAFILES;

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