I had upgraded oracle databases from 10.2.0.3 to 10.2.0.4. Everything completed correctly. Prior to the upgrade the compatibilty parameter was set to 10.2.0.2. I needed to put back some 'custom' parameters and at the same time changed the compatibily parameter to 10.2.0.
When bringing up the database i received the following error:
ORA-00201: control file version 10.2.0.2.0 incompatible with ORACLE version
10.2.0.0.0 ORA-00202: control file:
I put back the compatibility to 10.2.0.2 and it came up fine. Any idea as to why this error occurred?
A previously published article on Experts Exchange ("Joins in Oracle", http://www.experts-exchange.com/Database/Oracle/A_8249-Joins-in-Oracle.html) makes a statement about "Oracle proprietary" joins and mixes the join syntax with gen…
This post first appeared at Oracleinaction (http://oracleinaction.com/undo-and-redo-in-oracle/)by Anju Garg (Myself).
I will demonstrate that undo for DML’s is stored both in undo tablespace and online redo logs. Then, we will analyze the reaso…