[单选] You need to perform certain data manipulation operations through a view called EMP_DEPT_VU, which you previously created. You want to look at the definition of the view (the SELECT statement on which the view was create.) How do you obtain the definition of the view? （）

You work as a database administrator for Supportcenter.cn. You enabled tracing while creating a listener to your database. What additional information is available to you when you enable tracing？（） Information about each Oracle Net connection.。 Information about each entry in theLinstener.orafile。 Information about the changed done in the database。 Information about the different listeners in your system。 Information about all thenondatabasefiles required to operate the database。 霍夫曼比例是指（） A.消费品工业净产值与资本品工业净产值的比例 。 B.供给与需求的比例 。 C.轻工业品净产值与重工业品净产值的比例 。 D.以上都对。 An IT director is eager to adopt POWER7 servers because of their relative performance ratings and energy efficiency， but is concerned about migrating applications which require AIX 5.3. Which of the following will address his concern？（） POWER7 servers running AIX 5.3 operate in POWER5+ mode.。 POWER7 servers running AIX 5.3 operate in POWER6 and POWER6+ mode.。 POWER7 servers running AIX 5.3 operate in POWER5 and POWER6 modes.。 POWER7 servers running AIX 5.3 operate in POWER6 and POWER7 modes.。 A customer has a file server using RAID-5 with 8KB sequential write operations.  How should the disk controller cache be configured for optimal performance and data integrity？（） Use write-back cache with battery backup enabled。 Use write-through cache with battery backup enabled。 Use read-back cache with battery backup enabled。 Use read-through cache with battery backup enabled。 用人单位未办理社会保险登记的，由人民法院核定其应当缴纳的社会保险费。 You need to perform certain data manipulation operations through a view called EMP_DEPT_VU, which you previously created. You want to look at the definition of the view (the SELECT statement on which the view was create.) How do you obtain the definition of the view? （）