OCP-1Z0-053-200题-166题-173

QUESTION 166

Which of the following is not a configurable attribute for an individual disk group?

A. AU_SIZE

B. COMPATIBLE.RDBMS

C. COMPATIBLE.ASM

D. DISK_REPAIR_TIME

E. DG_DROP_TIME

Answer: E

同173题：http://blog.csdn.net/rlhua/article/details/13007795

答案解析：

参考：http://docs.oracle.com/cd/E11882_01/server.112/e18951/asmdiskgrps.htm#OSTMG94106

排除法，选E

Disk Group Attributes

Disk group attributes are parameters that are bound to a disk group, rather than an Oracle ASM instance.

Disk group attributes can be set when a disk group is created or altered, unless otherwise noted in the following list.

• ACCESS_CONTROL.ENABLED

  This attribute can only be set when altering a disk group.

  For information about the ACCESS_CONTROL.ENABLED attribute, see "Setting Disk Group Attributes for Oracle ASM File Access Control".

• ACCESS_CONTROL.UMASK

  This attribute can only be set when altering a disk group.

  For information about the ACCESS_CONTROL.UMASK attribute, see "Setting Disk Group Attributes for Oracle ASM File Access Control".

• AU_SIZE

  This attribute can only be set when creating a disk group.

  For information about allocation unit size and extents, see "Allocation Units", "Extents", and "Specifying the Allocation Unit Size". For an example of the use of the AU_SIZE attribute, see Example 4-1, "Creating the DATA disk group".

• CELL.SMART_SCAN_CAPABLE

  This attribute is only applicable to Oracle Exadata storage.

  See Also:

  Oracle Exadata documentation

• COMPATIBLE.ASM

  For information about the COMPATIBLE.ASM attribute, see "COMPATIBLE.ASM".

• COMPATIBLE.RDBMS

  For information about the COMPATIBLE.RDBMS attribute, see "COMPATIBLE.RDBMS".

• COMPATIBLE.ADVM

  For information about the COMPATIBLE.ADVM attribute, see "COMPATIBLE.ADVM" and "Overview of Oracle ASM Dynamic Volume Manager".

• CONTENT.TYPE

  The CONTENT.TYPE attribute identifies the disk group type: data, recovery, or system. The type value determines the distance to the nearest neighbor disk in the failure group where Oracle ASM mirrors copies of the data. The default value is data which specifies a distance of 1 to the nearest neighbor disk. A value of recovery specifies a distance of 3 to the nearest neighbor disk and a value of system specifies a distance of 5.

  The attribute can be specified when creating or altering a disk group. If CONTENT.TYPE attribute is set or changed using ALTER DISKGROUP, then the new configuration does not take effect until a disk group rebalance is explicitly run.

  The CONTENT.TYPE attribute is only valid for disk groups that are set to normal or high redundancy. The COMPATIBLE.ASM attribute must be set to 11.2.0.3or higher to enable the CONTENT.TYPE attribute for the disk group.

  The attribute can be set with SQL, ASMCMD, or ASMCA. For example:

  SQL> CREATE DISKGROUP data NORMAL REDUNDANCY

          FAILGROUP controller1 DISK

          '/devices/diska1' NAME diska1,

  ...

          ATTRIBUTE

          'compatible.asm' = '11.2.0.3',

          'content.type' = 'recovery',

  ...

   

  SQL> ALTER DISKGROUP data SET ATTRIBUTE 'content.type' = 'data';

  This attribute is primarily intended for use with Oracle Exadata storage.

  See Also:

  Oracle Exadata documentation

• DISK_REPAIR_TIME

  This attribute can only be set when altering a disk group.

  For information about the DISK_REPAIR_TIME attribute, see "Oracle ASM Fast Mirror Resync".

• IDP.BOUNDARY and IDP.TYPE

  These attributes are intended for use with Oracle Exadata storage.

  See Also:

  Oracle Exadata documentation

• SECTOR_SIZE

  This attribute can only be set when creating a disk group.

  For information about the SECTOR_SIZE attribute, see "Specifying the Sector Size for Drives".

• STORAGE.TYPE

  The STORAGE.TYPE disk group attribute specifies the type of the disks in the disk group. The possible values are AXIOM, ZFSSA, and OTHER. If the attribute is set to AXIOM or ZFSSA, then all disks in the disk group must be of that type. If the attribute is set to OTHER, then any types of disks can be in the disk group.

  If the STORAGE.TYPE disk group attribute is set to AXIOM or ZFSSA, then functionality for Hybrid Columnar Compression (HCC) can be enabled for Pillar Axiom or ZFS storage.

  
  
  
  

Explanation/Reference:

Section: Managing Database Performance & Tuning