create table testversion ( pkl number primary key,s_var varchar2(10));
ALTER TABLE TESTVERSION CACHE COMPRESS PARALLEL ( DEGREE Default INSTANCES Default );
exec dbms_wm.enableversioning('TESTVERSION');
exec dbms_wm.disableversioning('TESTVERSION');
ORA-20231: 'TESTVERSION' failed during DisableVersioning. Error:
ORA-39726: unsupported add/drop column operation on compressed tables .
This error occurs when we try to version disable a compressed table ;its because during version enabling a compressed table four columns VERSION, NEXTVER, DELSTATUS, LTLOCK are not created
SO THERE IS NO USE TO VERSION ENABLE A COMPRESSED TABLE BECAUSE FOLLOWING
VERSION, NEXTVER, DELSTATUS, LTLOCK COLUMNS ARE NOT CREATED WHICH ARE THE NUCLUES OF THE VERSIONING
WHEN A COMPRESSED TABLE IS VERSION ENABLED ONLY A VIEW NAMED 'TESTVERSION' IS CREATED .NO TRIGGERS AND OTHER VIEWS ARE CREATED
WHEN A COMPRESSED TABLE IS TRIED TO VERSION DISABLED ITS STATE IS CHANGED TO 'DV' .EVEN THOUGHT IT THROWS ERROR
CHECK THE BELOW QUERY FOR VERSIONED STATUS OF A TABLE
SELECT DISABLING_VER,UNDO_CODE FROM WMSYS.WM$VERSIONED_TABLES WHERE OWNER='SCHEMAMERGE' AND TABLE_NAME='TESTVERSION' ;
AND IF YOU CHECK IN UNDO_CODE COLUMN OF THIS WMSYS.WM$VERSIONED_TABLES TABLE YOU CAN GET WHY VERSION DISABLE OF THE COMPRESSED TABLE DEOSNT WORK
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