Note the following functionalities of various background processes： 1. Record the checkpoint information in data file headers. 2. Perform recovery at instance startup. 3. Cleanup unused temporary segments. 4. Free the resources used by a user process when it fails. 5. Dynamically register database services with listeners. 6. Monitor sessions for idle session timeout. Which option has the correct functionalities listed for a background process（） 正确。 错误。
桌面系统管理为什么强调正版的使用（） 正确。 错误。
RMAN offers the equivalent of the SQL command alter database backup controlfile to trace.（） 正确。 错误。
The TS1130 tape drive is designed for high-performance computing environments where highreliability, capacity, and performance are mandated. In addition to TS3400, TS3500 and 3494 tapelibraries, which one of the following environments should be considered for its use?（） 正确。 错误。
结构的（）是指在正常使用时，结构应具有良好的工作性能。 正确。 错误。
对一家现存企业进行价值评估，决定价格的最重要因素是企业近几年的收益状况。
