Your database has a table customer that contains the columns cust_name, amt_due, and old_status.
Examine the commands executed and their output:
A.
Supplemental logging is not enabled for the database.
B.
The undo data that existed for versions of rows before the change to the table structure is invalidated.
C.
The db_flashback_retention_target parameter is set to a lower value and the undo data pertaining to the
first transaction is flushed out.
D.
Undo retention guarantee is not enabled.
E.
Flashback Data Archive is full after the first update statement.
Explanation:
B
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Examine the commands executed and their output:
SQL>UPDATEcustomersSETamt_due=amt_due+amt_due*l. 1WHEREcust_name=’JAMES’;
1row updated.
SQL> ALTER TABLE customers DROP COLUMN old_status;
Table Altered
SQL> UPDATE customers SET amt_due=amt_due+amt_due*1.5 WHERE
cust_r.ame=’JAMES’;
1 row updated.
SQL> COMMIT;
SQL> SELECT versions_xid AS XID, versior.s_startscr. AS START_SCN,
versions_er.cscn AS END_SCN, versior.s_operatior. AS OPERATION’, amt_due
FROM customers VERSIONS BETWEEN SCN MINVALULEAND MAXVALUE WHERE
custname=’JAMES’;.
XIDSTART_SCNEND_SCNOPERATIONAMT_DUE
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07002f00cl03000017063371706337 U3300