Oracle crs，rdbms，asm的版本兼容性

在日常数据库服务中，经常会碰到Oracle crs，rdbms，asm的版本兼容性问题，现摘录如下，以备不时之需。


oracle对版本兼容性有过如下描述：

引用

   1. The Oracle Clusterware (CRS) version must be the highest version down to the 4th digit in the possible combinations
   2. Oracle Clusterware must be installed into its own ORACLE_HOME (also referenced as CRS_HOME)
   3. You can have multiple ORACLE_HOMEs for the database releases.
   4. Starting with Oracle Database 10g Release 2, ASM and database can be installed in separate homes.
   5. When mixing software versions ASM functionality reverts to the functionality of the earliest release in use. For example, a 10.1.0.3 RDBMS instance working with a 10.2 ASM instance does not take advantage of new features in ASM. Conversely, 10.2 RDBMS instance working with a 10.1 ASM instance, will not take advantage of any of the new 10.2 features of ASM.
   6. You can use different users for Oracle Clusterware and database homes as long as they belong to the same primary group.
   7. Database users do not need access to the OCR and voting disk.