Which three are DATETIME data types that can be used when specifying column definitions? （） TIMESTAMP。 INTERVAL MONTH TO DAY。 INTERVAL DAY TO SECOND。 INTERVAL YEAR TO MONTH。 TIMESTAMP WITH DATABASE TIMEZONE。
肌内收缩时张力基本保持不变，但肌纤维长度缩短或延长称为：（） 等张运动。 等长运动。 等速运动。 放松运动。 耐力运动。
You are maintaining your OLTP database in Oracle10g. While observing the performance of the database， you find that the log switch occurs more than once for every 20 minutes， affecting the database performance. Which factor is responsible for frequent log switches？（） the value of the UNDO_RETENTION initialization parameter。 the value of the optimal redo log file size provided by the Redo Logfile Size Advisor。 the online redo log files size。 the number of redo log members in a grou。
教师学习特点。
A small bio-technical company is interested in implementing a 32-node Linux cluster. They developed their own software that allows all of the nodes to work on the same problem at the same time. The application requires messages to be passed between the nodes. Each node will require access to a shared storage pool of around 500GB. To identify throughput requirements for the storage pool， which of the following is the most appropriate question to ask？（） Is high availability required？。 Which network protocols are going to be used？。 What are the expected I/O’s per second to the storage？。 To what network infrastructure is the storage pool connected？。
An administrator wants to test the performance of an application at different memory sizes. What is the most effective way to perform the test and collect statistical information for each test？（）
