Set the UNDO_RETENTION parameter to AUTO.
Create an initial undo segment in undotablespace.
Set the UNDO_RETENTION parameter to 900 or more
Set the initialization parameter UNDO_MANAGEMENT to AUTO
Set the UNDO_MANAGEMENT parameter to the name of an undotablespace
第1题：
You work as a database administrator at Certkiller .com. Your production database uses an Automatic Storage Management （ASM） instance to manage its files. You want to add a new disk group to the ASM instance to manage the increased data load. What action would you perform to include the new disk group in the ASM instance without causing any impact on the currently connected users？（）
第2题：
You work as a database administrator for Supportcenter.cn. You want to administer your database servers， which are running on different host machines， using the Web-enabled grid control interface. You have configured the agent on the host machines. You have started the Oracle Database 10g Grid Control utility on your machine. Which two additional components would you configure to achieve this objective？（）
第3题：
You work as a database administrator for Supportcenter.cn. You have been asked to use a centralized administrative tool to administer your database servers and application servers. In order to achieve the objective， which component would you configure on each database server？（）
第4题：
You work as a database administrator for Supportcenter.cn. You want to create your database with the automatic undo management feature enable.Which two tasks must you perform to achieve this？（）
第5题：
You work as a database administrator for Certkiller .com. You want to create your database with the automatic undo management feature enable.Which two tasks must you perform to achieve this？（）
第6题：
You work as a database administrator for Certkiller .com. You want to administer your database servers，which are running on different host machines，using the Web-enabled grid control interface. You have configured the agent on the host machines. You have started the Oracle Database 10g Grid Control utility on your machine. Which two additional components would you configure to achieve this objective？（）
第7题：
You work as a database administrator for Supportcenter.cn. In your organization， you have four databases， SupportCenter DB01， SupportCenter DB02， SupportCenter DB03， and SupportCenter DB04， which are located in Berlin， Frankfurt，Rammstein， and Munich respectively， and which were created using Database Configuration Assistant （DBCA）. You want to perform administrative tasks on these databases that include startup and shutdown， taking regular backups， and so on， fromFrankfurtusing Oracle tools. Which Oracle file would you enable to perform this task？（）
第8题：
You want to use the Flashback Transaction Query feature to identify all the changes made to your database within a specific time period. What is a prerequisite for using the Flashback Transaction Query feature？（）
第9题：
You work as a database administrator for Certkiller .com. Your database is configured for automatic undo management. UNDO_RETENTION is set to 3 hours. You want to flash back a table that was created last year. How far back can the flashback query go？ （）
第10题：
You work as a database administrator for Supportcenter.cn. Your database is in NOARCHIVELOG mode and you want to perform a backup. Which type of backup would be appropriate in this case？（）