Which mode of database shutdown requires an instance recovery at the time of the next database startup?（）
Your database is in ARCHIVELOG mode. You have two online redo log groups, each of which contains one redo member. When you attempt to start the database, you receive the following errors:
Which statement should you use to resolve this issue?（）
Given the following RMAN commands，choose the option that reflects the order required to restore your currently operational ARCHIVELOG-mode database.（）
a. restore database
b. recover database
c. shutdown immediate
d. startup
e. restore archivelog all
f. alter database open
Immediately after adding a new disk to or removing an existing disk from an ASM instance, you find that the performance of the database goes down initially until the time the addition or removal process is completed, and then gradually becomes normal.
Which two activities would you perform to maintain a consistent performance of the database while adding or removing disks?（）
You conned using SQL Plus to the root container of a multitenant container database (CDB) with SYSDBA privilege.
The CDB has several pluggable databases (PDBs) open in the read/write mode.
There are ongoing transactions in both the CDB and PDBs.
What happens alter issuing the SHUTDOWN TRANSACTIONAL statement?（）
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