You execute a command to resize a data file， sales.dbf， of size 200 MB in your database： ALTER DATABASE DATAFILE ’/remorse/sales.dbf’ RESIZE 150M； Which statement is true about this command（） The command must be issued in MOUNT state.。 The command succeeds only if the data file is offline.。 The command must be issued when the database is in the archivelog mode.。 The command succeeds if no extent in the tablespace is currently allocated above the 150 MB boundary of the file.。
承包人完成的予以计量的工程质量应符合合同约定标准。
Which three pieces of information are to be mandatorily provided while creating a new listener using Enterprise Manager Database Control？（） the port used by the listener。 the protocol used by the listener。 the server name where the listener runs。 the log file and trace file destination for the listener。 the database services to be registered with the listener。
资产评估的经济原则包括（） 科学性原则。 替代原则。 专业性原则。 预期原则。 最佳利用原则。
Examine the structure of the EMPLOYEES table: You need to create an index called NAME_IDX on the first name and last name fields of the EMPLOYEES table. Which SQL statement would you use to perform this task?（） CREATE INDEX NAME_IDX (first_name, last_name);。 CREATE INDEX NAME_IDX (first_name AND last_name);。 CREATE INDEX NAME_IDX ON (first_name, last_name);。 CREATE INDEX NAME_IDX ON employees (first_name AND last_name);。 CREATE INDEX NAME_IDX ON employees(first_name, last_name);。 CREATE INDEX NAME_IDX FOR employees(first_name, last_name)。
三相异步电动机启动运行时，要求（）。
