单选题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？（）AThe database instance is not available.BThe ALTER TABLE command does not have WAIT optionCThe table or a row in the table is currently locked by another user session.DThe database instance is busy processing other user sessions commands.EThe CUSTOMERS table has no long running query active at the time when this request is made.FThe server process executing the ALTER TABLE command is busy with another command execution
单选题
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
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