[单选]
Companycom has been performing scheduled backups of their data to tape using "tar" in a script for over one year with no problems. Recently, the tar command is returning a non zero return code during the backup phase, causing the script to fail.
What is the primary cause of this problem?（）

A . The files have grown to over eight gigabytes in size
B . The file systems are corrupt, and fsck should be run
C . The tape block size has been changed from the default
D . The user’s limit has been changed to less than eight gigabyte

对于液体火灾使用泡沫灭火机应讲泡沫喷到燃烧区（）。下面。周围。附近。上空。 In Recovery Manager （RMAN）， you are taking image copies of the datafiles of your production database and rolling them forward as regular intervals. You attempt to restart your database instance after a regular maintenance task， you realize that one of the data files that belongs to the USERS tablespace is damaged and you need to recover the datafile by using the image copy. You could perform the following steps to accomplish this： 1） Mount the database 2） Take the data file offline 3） Bring the data file online 4） Use the RMAN SWITCH TO command to switch the image copy 5） Apply the archived redo logs 6） Open the database 7） Use the RMAN RESTORE TO command to switch to the image copy Which two options illustrate the correct sequence of steps that you could follow？（） 2， 6， 4， 5， 3。 1， 2， 4， 5， 3， 6。 1， 2， 4， 6， 3。 1， 2， 7， 5， 3， 6。衡量各种建筑材料热工性能的主要指标是（）。传热系数。导热系数。遮阳系数。可见光透射比。 Which of the following statements is TRUE about mounting a file system?（） A file system cannot be mounted on a directory containing data.。 Mounting a file system on a mount point containing data will delete the data.。 Mounting a file system on a amount point containing data will make the data temporarily inaccessible.。 A systems administrator must manually create an empty directory prior to mounting an AIX JFS.。 Which two client requests are captured during database replay Capture？（） Flashback queries。 Shared server requests。 Login and logoff activities of sessions。 Direct path load of data from external files by using utilities such as SQL *loader。 Data definition language （DDL） and data manipulation language （DML） operatio。

Companycom has been performing scheduled backups of their data to tape using "tar" in a script for over one year with no problems. Recently, the tar command is returning a non zero return code during the backup phase, causing the script to fail.
What is the primary cause of this problem?（）

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