单选题View the Exhibit and examine the parameters. User A executes the following command to update the TRANS table： SQL> UPDATE B.trans SET tr_amt=tr_amt+500 WHERE c_code=’C005’； Before user A issues a COMMIT or ROLLBACK command， user B executes the follow
题目
单选题
View the Exhibit and examine the parameters. User A executes the following command to update the TRANS table： SQL> UPDATE B.trans SET tr_amt=tr_amt+500 WHERE c_code=’C005’； Before user A issues a COMMIT or ROLLBACK command， user B executes the following command onthe TRANS table： SQL> ALTER TABLE trans MODIFY （tr_type VARCHAR2（3））； What would happen in this scenario（）
A
The ALTER TABLE command modifies the column successfully.
B
The DDL operation gets higher priority and transaction for user a is rolled back.
C
The ALTER TABLE command waits indefinitely until user a ends the transaction.
D
The ALTER TABLE command fails after waiting for 60 seconds due to the resource being busy.