Unable to extend rollback segment
回滚（撤销）段无法增长，因为撤销表空间已满。
SELECT tablespace_name, SUM(bytes)/1024/1024 MB FROM dba_data_files WHERE tablespace_name LIKE '%UNDO%' GROUP BY tablespace_name;SHOW PARAMETER undo;SELECT * FROM v$transaction ORDER BY used_ublk DESC;