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Oracle认证考试

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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.
正确答案:D
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