Which statement is true about Enterprise Manager (EM) express in Oracle Database 12c?（）

来源：考试资料网2018-08-01

You are connected to a pluggable database (PDB) as a common user with DBA privileges.
The STATISTICS_LEVEL parameter is PDB_MODIFIABLE. You execute the following:
SQL > ALTER SYSTEM SET STATISTICS_LEVEL = ALL SID = ‘*’ SCOPE = SPFILE;
Which is true about the result of this command?（）

来源：考试资料网2018-08-01

Which three statements are true about Oracle Data Pump export and import operations?（）

来源：考试资料网2018-08-01

On your Oracle 12c database, you Issue the following commands to create indexes
SQL > CREATE INDEX oe.ord_customer_ix1 ON oe.orders (customers_id, sales_rep_id) INVISIBLE;
SQL> CREATE BITMAP INDEX oe.ord_customer_ix2 ON oe.orders (customers_id, sales_rep_id);
Which two statement are correct?（）

来源：考试资料网2018-08-01

Identify two situations in which the alert log file is updated.（）

来源：考试资料网2018-08-01