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dump index: alter session set events 'immediate trace name treedump level <object_id>'; dump control file: alter session set events 'immediate trace name controlf level 10';&nbsp...

alter table tt set unused column age;alter table tt drop unused column;

the following is my practise based on warehose's rowidselect u.rowid from knta_users u where u.username='admin';A-Z (0-25),a-z(26-51),0-9(52-61),+(62),/(63)AAATDT---object_id 19*power(64,2)+3*64+19...