The database Is configured in ARCHIVELOG mode. The database needs to be up 24 X 7. You want to perform user managed backup for the data files of the HR_DATA tablespace. To accomplish the task， you issued the following command： SQL> ALTER TABLESPACE hi_data BEGIN BACKUP； Which two statements are true in this scenario？（） No transaction on the tablespace is allowed but you can perform queries.。 The tablespace will automatically come out of backup mode when the file copy is complete.。 The checkpoint change number is frozen in headers of the data files until the file is removed from backup mode.。 The database writes the before image of an entire block to the redo stream before modifying. block tor the first time.。
克什米尔冲突之所以在国际社会引起广泛关注，是因为（）。①世界人民渴望和平．反对战争②发展经济是维护和平的有力保障③和平是人类生存与发展的基本条件④维护和平才能为经济发展创造良好的国际环境 ①②③。 ①③①。 ②③④。 ①②④。
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。
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? （） Use the DESCRIBE command in the EMP_DEPT VU view.。 Use the DEFINE VIEW command on the EMP_DEPT VU view.。 Use the DESCRIBE VIEW command on the EMP_DEPT VU view.。 Query the USER_VIEWS data dictionary view to search for the EMP_DEPT_VU view.。 Query the USER_SOURCE data dictionary view to search for the EMP_DEPT_VU view.。 Query the USER_OBJECTS data dictionary view to search for the EMP_DEPT_VU view.。
对数据库除采取著作权保护外，还提供“特殊权利”保护的国家（地区）是（） 欧盟。 美国。 日本。 中国。
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？（）
