单项选择题 You created a database by using the Database Configuration Assistant. What must you do to access a user account in the sample schemas？（）

多项选择题 The multithreaded agent architecture for heterogeneous services is similar to the Oracle multithreaded server architecture. The principal difference is that it used threads instead of processes.  What are thee kinds of threads that it uses？（）

单项选择题 Your database is running in NOARCHIVELOG mode. Every night there is a backup taken using RMAN. During your startup this morning you received en error regarding DISK 3 on your server. This is the location of your data file for the SYSTEM tablespace. Which option is open to you？（）