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Oracle Database Administration II Sample Questions (Q141-Q146):
NEW QUESTION # 141
Which three are true about an application seed pluggable database (PDB)?
- A. It cannot be dropped from its application container.
- B. It cannot be added to an application container after the application container has already been created.
- C. It is automatically synchronized with its application root PDB when an application is installed.
- D. It Is automatically synchronized with its application root PDB when an application is upgraded.
- E. It is not required in an application container.
- F. A new application PDB created by cloning an application seed PDB can have an old version of the application installed after cloning completes.
- G. A new application PDB created by cloning an application seed PDB can have an up-to-date version of the application installed after cloning completes.
Answer: C,F,G
NEW QUESTION # 142
Which two are true about server-generated alerts? (Choose two.)
- A. Stateful alerts are purged automatically from the alert history.
- B. Stateless alerts can be cleared manually.
- C. Stateless alerts can be purged manually from the alert history.
- D. Stateful alerts must be created by a DBA after resolving the problem.
- E. Stateless alerts are automatically cleared.
Answer: B,C
Explanation:
Except for the tablespace space usage metric, which is database related, the other metrics are instance related. Threshold alerts are also referred to as stateful alerts which are automatically cleared when an alert condition clears. Stateful alert appears in DBA_OUTSTANDING_ALERTS and when cleared go to DBA_ALERT_HISTORY. Other server-generated alerts correspond to specific database events such as ORA-* errors, "Snapshot too old" errors, Recovery Area Low on Free Space, Resumable Session Suspended. These are non threshold based alerts, also referred to as stateless alerts. Stateless alerts go directly to the History table. +++ Most alerts (such as "Out of Space") are cleared automatically when the cause of the problem disappears. However, other alerts (such as generic alert log errors) are sent to you for notification and must be acknowledged by you. After taking the corrective measures, you acknowledge an alert by clearing or purging it. Clearing an alert sends the alert to the Alert History which is accessible from Monitoring sub menu. Purging an alert removes it from the Alert History.
Reference:
https://jameshuangsj.wordpress.com/2019/12/01/clears-stateless-alerts-in-oem-by-using-emcli/
NEW QUESTION # 143
Which two are true about automatic block repair? (Choose two.)
- A. Real-Time Query must be enabled on a primary database for automatic block repair to be done on any of its physical standby databases.
- B. Real-Time Query must be enabled on a physical standby database for automatic block repair to be done on its primary database.
- C. It is not possible for media corrupt blocks.
- D. Real-Time Query must be enabled on a physical standby database for automatic block repair to be done on that physical standby database.
- E. Automatic block repair can repair blocks with no standby database if DB_BLOCK_CHECKING = TRUE.
Answer: A,D
NEW QUESTION # 144
Which two are true about common objects? (Choose two.)
- A. They can be extended data-linked in CDB$ROOT.
- B. They can exist in CDB$ROOT and an application root.
- C. They can be created only in an application root.
- D. They can be only metadata-linked in an application container.
- E. They can exist in user-defined schemas only in application containers.
- F. They can be created only in CDB$ROOT.
Answer: C,E
Explanation:
Reference:
https://blog.toadworld.com/2017/08/01/oracle-multi-tenant-application-containers-part-iii-sharing- of-data-in-application-common-objects
NEW QUESTION # 145
Which two are true about the Oracle database methodology? (Choose two.)
- A. Tuning activities should stop once agreed service levels for performance have been met.
- B. The Oracle Database time model should be used to find the database and instance areas most in need of tuning.
- C. The database instance memory should always be tuned before tuning any file systems.
- D. The alert log should be used to find the database and instance areas most in need of tuning.
- E. SQL statements should always be tuned before tuning any file systems.
- F. Tuning activities should stop once the user is satisfied with performance.
Answer: B,E
Explanation:
A is correct. It will show what the database is spending most time on, that (usually) indicates where tuning is required.
B and C relate to user experience. We (DBAs) should work with users, to help achieve their requirements. However, we can be proactive outside of this. Just because a user is happy - doesn't mean we can't make them "happier" by doing tuning activities before things get bad. So, neither of these should be true.
D is incorrect, memory is much less likely to be a culprit of an issue, than a filesystem I/O issue.
E is correct. We should never try to tune a file system first. If we make a file system change that fixes one SQL statement - it might harm a different SQL statement. However, if we tune the first SQL statement, it will have no impact on the rest of the system. Therefore, we should try to tune
"bad SQL" first.
F is incorrect - the alert log gives us little/no information to do with tuning.
NEW QUESTION # 146
......
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