相关试题
单选题 choose the best answer Evaluate the following SQL statement: ALTER TABLE hr.emp
SET UNUSED (mgr_id);
Which statement is true regarding the effect of the above SQL statement?
单选题 You are administering a database and you receive a requirement to apply t he following restrictions:
1A connection must be terminated after four unsuccessful login attempts by user.
2A user should not be able to create more than four simultaneous sessions.
3User session must be terminated after 15 minutes of inactivity.
4Users must be prompted to change their passwords every 15 days. How would you accomplish these requirements?
单选题 choose one
Which statement is true about the DEFAULT profile?
单选题 A user establishes a connection to a database instance by using an Oracle
Net
Connection. You want to ensure the following:
1The user account must be locked after five unsuccessful login attempts.
2Data read per session must be limited for the user.
3The user cannot have more than three simultaneous sessions.
4The user must have a maximum of 10 minutes session idle time
Before being logged off automatically.
How would you accomplish this?
单选题 choose one
Which statement is true about profiles?
单选题 Evaluate the following ALTER TABLE statement:
ALTER TABLE orders SET UNUSED (order_date);
Which statement is true?
单选题 Examine the description of the SALES1 table:
SALES2 is a table with the same description as
SALES1. Some sales data is duplicated in both tables.
You want to display the rows from the SALES1 table which are not present in the SALES2 table. Which set operator generates the required output?
单选题 In your database, you want to ensure that idle sessions that are blocking active are automatically terminated after a specified period of time. How would you accomplish this?