OCP 1Z0 053 76

76.Identify three key features of ASM. (Choose three.) 
A. file striping 
B. allocation unit mirroring 
C. automatic disk rebalancing 
D. automatic file size increment 
E. automatic undo management 
Answer: ABC

asm特性：条带、镜像、增减盘后的rebalancing


D E 均非asm特性

Enabling and Disabling Automatic Extension for a Data File

You can create data files or alter existing data files so that they automatically increase in size when more space is needed in the database. The file size increases in specified increments up to a specified maximum.

Setting your data files to extend automatically provides these advantages:

• Reduces the need for immediate intervention when a tablespace runs out of space

• Ensures applications will not halt or be suspended because of failures to allocate extents

Overview of Automatic Undo Management

Oracle provides a fully automated mechanism, referred to as automatic undo management, for managing undo information and space. With automatic undo management, the database manages undo segments in an undo tablespace. Beginning with Release 11g, automatic undo management is the default mode for a newly installed database. An auto-extending undo tablespace named UNDOTBS1 is automatically created when you create the database with Database Configuration Assistant (DBCA).