Mismatch between COMPATIBLE Parameter and Oracle Version

Hi,
If the ORACLE version is say 11g but the compatible parameter in init.ora is say 9.2.0 or 8.1.7 what will be the effect on the database?
Will the database behave as like 11g or of the lower version?
If we alter the init.ora to the new version for compatible paremeter will it affect DB rebooting?
This is an interview question and i could not answer.
Please let me know the answers.

If the ORACLE version is say 11g but the compatible parameter in init.ora is say 9.2.0 or 8.1.7 what will be the effect on the database?
Will the database behave as like 11g or of the lower version?
If we alter the init.ora to the new version for compatible paremeter will it affect DB rebooting?
This is an interview question and i could not answer.Here, database created in 11gR2, if try to set lower compatibility it wont be allowed, Below is example.
Check this article of TKyte.
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:485421569569
Init.ora Parameter "COMPATIBLE" Reference Note [ID 30699.1]
SQL> show parameter compatible
NAME                                 TYPE        VALUE
compatible                           string      11.2.0.0.0
SQL> alter system set compatible='10.2.0' scope=spfile;
System altered.
SQL> shut immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.
Total System Global Area 778387456 bytes
Fixed Size                  1374808 bytes
Variable Size             276825512 bytes
Database Buffers          494927872 bytes
Redo Buffers                5259264 bytes
ORA-00201: control file version 11.2.0.0.0 incompatible with ORACLE version
10.2.0.0.0
ORA-00202: control file: 'C:\ORACLE\ORADATA\ORCL\CONTROL01.CTL'
SQL>SID3
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Name      Amritansu Ray
Close the thread if answered, Keep the forum clean.
Edited by: CKPT on Feb 15, 2012 9:54 PM

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