11G new Features-ASM compatibility

In Oracle 11g, ASM supports both 10g and 11g databases. However, the ASM version cannot be less than the database version.

Two parameters related to compatibility now:

Compatible.rdbms

The minimum supported version of the Oracle database.

compatible.asm

Controls the data storage format for ASM metadata on ASM disks. For example, if you set the value of Compatible.asm to 11.1, the ASM software version must be at least 11.1.

The ASM compatibility level must be at least the same as the RDBMS compatibility level and not lower than the RDBMS compatibility levels. Compatible.asm only controls the format of the ASM metadata, and the true data format still has the compatibility control of the RDBMS.

Specify compatibility when creating disks:

sql> Create DiskGroup dgroup1 disk'/dev/raw*'Attribute'compatible.asm'='11.1'; The value of the #compatible. DBMS is the default value of 10.1SQL> Create DiskGroup dgroup1 Disk'/dev/raw*'Attribute'compatible.asm'='11.1','Compatible.rdbms'='10.1';

To modify a property:

Set ' compatible '='11.1';

View Compatibility:

    Select  from V$asm_diskgroup;        Compatibility                  database_compatibility    ------------------------------------------------------------    11.2. 0.0. 0                     10.1. 0.0. 0    11.2. 0.0. 0                     10.1. 0.0. 0         SQL

• You cannot modify compatibility during a rolling upgrade
• Compatibility values can only be upgraded and cannot be degraded
• Only set the corresponding compatibility level to use the new features of the corresponding version

11G new Features-ASM compatibility