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单项选择题 A user executes a query on the EMPtable， which contains thousands of rows， to get details about employees in one of the departments. The user receives the following error：  SQL> SELECT ename FROM emp WHERE deptno=10 ORDER BY sal；  SELECT ename FROM emp WHERE deptno=10 ORDER BY sal  ERROR at line 1：  ORA-01157： cannot identify/lock data file  201 - see DBWR trace file ORA-01110： data file 201：’/u01/app/oracle/oradata/orcl/temp01.dbf’  What is a possible reason？（）

A、 The tempfile belonging to the default temporary tablespace is missing.

B、 The database is opened in restricted mode， so queries are not allowed

C、 The default temporary tablespace required to execute the query is offline.

D、 The default temporary tablespace required to execute the query is dropped.

E、 The default temporary tablespace required to execute the query is read-only.

  • A

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