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（）
发布日期：2021-01-28
The ALTER TABLE command modifies the column successfully.
The DDL operation gets higher priority and transaction for user a is rolled back.
The ALTER TABLE command waits indefinitely until user a ends the transaction.
The ALTER TABLE command fails after waiting for 60 seconds due to the resource being busy.
标签： view exhibit examine parameters user
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