You execute the following command in your Certkiller .com production database to change the width of the CUST_NAME column of the CUSTOMERS table: ALTER TABLE customers MODIFY (cust_nameVARCHAR2 (40)) / When you execute the command, it displays the following error message: ERROR at line 1: ORA-00054: resource busy and acquire with NOWAIT specified What could be the reason for the error message?()
- A、The database instance is not available.
- B、The ALTER TABLE command does not have WAIT option
- C、The table or a row in the table is currently locked by another user session.
- D、The database instance is busy processing other user sessions commands.
- E、The CUSTOMERS table has no long running query active at the time when this request is made.
- F、The server process executing the ALTER TABLE command is busy with another command execution
正确答案:C
答案解析:有
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