You plan to execute the following command to perform a Flashback Database operation in your database:
SQL> FLASHBACK DATABASE TO TIMESTAMP (SYSDATE -5/24);
Which two statements are true about this?（）

You notice a performance change in your production Oracle 12c database. You want to know which change caused this performance difference.
Which method or feature should you use?（）

You need to create a view EMP_VU. The view should allow the users to manipulate the records of only the employees that are working for departments 10 or 20.
Which SQL statement would you use to create the view EMP_VU?（）

You are working on a 24X7 database. You want to design a backup strategy for your database that uses user managed backups. You want to be able to perform all backups while the database remains online.
Which statement about performing user-managed backups in a 24x7 environment is true?（）

The database administrator of your company created a public synonym called HR for the HUMAN_RESOURCES table of the GENERAL schema, because many users frequently use this table. As a user of the database, you created a table called HR in your schema.
What happens when you execute this query?（）

You are planning the creation of a new multitenant container database (CDB) and want to store the ROOT and SEED container data files in separate directories.
You plan to create the database using SQL statements.
Which three techniques can you use to achieve this?（）

You are developing a Windows Communication Foundation (WCF) service that is hosted by a Windows Forms Application.The ServiceHost instance is created in the Form Constructor.You need to ensure that the service is not blocked while the UI thread is busy.
What should you do?（）

You use Microsoft .Net Framework 4 to create a Windows Form application.
You created a new application, you then wrote the code below:
Thread.CurrentThread.CurrentUICulture = Thread.CurrentThread.CurrentCulture
Which of the following options are TRUE? （）

You create a Web application. The Web application enables users to change fields in their personal profiles. Some of the changes are not persisting in the database. You need to raise a custom event to track each change that is made to a user profile so that you can locate the error.
Which event should you use? （）

You have three temporary tablespace groups named G1, G2, and G3 in your database. You are creating a new temporary tablespace as follows:
CREATE TEMPORARY TABLESPACE TEMP1 TEMPFILE '/u1/data/temp1.dbf' SIZE 10M
TABLESPACE GROUP '';
Which statement regarding the above command is correct?（）