[单选]

Your production database is running in archivelog mode and you are using recovery manager (RMAN) with recovery catalog to perform the database backup at regular intervals. When you attempt to restart the database instance after a regular maintenance task on Sunday, the database fails to open displaying the message that the data file belonging to the users tablespace are corrupted.
The steps to recover the damaged data files are follows:
1. Mount the database
2. Open the database
3. Recover the data file
4. Restore the data file
5. Make the data file offline
6. Make the data file online
Which option identifies the correct sequence that you must use to recover the data files?（）

Due to recent changes in infrastructure， a four-node cluster has been split into two locations， but  is still listed as a single site in HACMP. The location split has proceeded smoothly， the only exception being the serial heartbeats. There are constant errors causing the serial network to go up and down.  What is the best solution to resolve this issue？（）    Install the dialback failsafe optional filesets.。  Change the speed parameter in "smitty tty" to be 38400，8，N，1.。  Install additional rsct filesets required for non null modem connections.。  Change the parameters in the Network Module to stop RSCT from changing the speed of the line.。 申请使用涉密测绘成果的条件（） 用于公益事业。 申请人应当是在我国依法成立的法人或者组织。 有明确.合法的使用目的。 申请的基础测绘成果范围.种类.精度与使用目的相一致。 有符合国家保密管理规定的保密管理制度和条件。 A company with three sites （one local production site， one intermediate site， and one remote site） wants to use Metro/Global Mirror.  Which statement is correct about the volumes at the intermediate site（） the intermediate site volumes are Metro Mirror target volumes for the remote site。 the intermediate site volumes are Global Mirror target volumes for the remote site。 the intermediate site volumes are both Global Mirror source and Metro Mirror target at the same time。 the intermediate site volumes are alsoFlashCopy sources for the remote site。 地下工程，铺贴厚度小于3mm的高聚物改性沥青卷材时，严禁采用的施工方法是（）。 冷粘法。 热熔法。 满粘法。 空铺法。 Given the following query:SELECT last_name, first_name, age, hire_date FROM employee WHERE age > 40Which of the following clauses must be added to return the rows sorted by AGE, oldest first, and by LAST_NAME, from A to Z?（） SORT BY age ASC, last_name。 SORT BY age DESC, last_name。 ORDER BY age DESC, last_name。 ORDER BY age ASC, last_name。

Your production database is running in archivelog mode and you are using recovery manager (RMAN) with recovery catalog to perform the database backup at regular intervals. When you attempt to restart the database instance after a regular maintenance task on Sunday, the database fails to open displaying the message that the data file belonging to the users tablespace are corrupted.
The steps to recover the damaged data files are follows:
1. Mount the database
2. Open the database
3. Recover the data file
4. Restore the data file
5. Make the data file offline
6. Make the data file online
Which option identifies the correct sequence that you must use to recover the data files?（）