In this Document
APPLIES TO:
Oracle Database - Enterprise Edition - Version 9.2.0.1 to 12.2.0.1 [Release 9.2 to 12.2]
Information in this document applies to any platform.
***Checked for relevance on 04-Dec-2013***
SYMPTOMS
The following error is occurring in the alert.log right before the database crashes.
ORA-00600: internal error code, arguments: [4194], [#], [#], [], [], [], [], []
This error indicates that a mismatch has been detected between redo records and rollback (undo) records.
ARGUMENTS:
Arg [a] - Maximum Undo record number in Undo block
Arg [b] - Undo record number from Redo block
Since we are adding a new undo record to our undo block, we would expect that the new record number is equal to the maximum record number in the undo block plus one. Before Oracle can add a new undo record to the undo block it validates that this is correct. If this validation fails, then an ORA-600 [4194] will be triggered.
CHANGES
This issue generally occurs when there is a power outage or hardware failure that initially crashes the database. On startup, the database does the normal roll forward (redo) and then rollback (undo), this is where the error is generated on the rollback.
CAUSE
This also can be cause by the following defect
Bug 8240762 Abstract: Undo corruptions with ORA-600 [4193]/ORA-600 [4194] or ORA-600 [4137] after SHRINK
Details:
Undo corruption may be caused after a shrink and the same undo block may be used
for two different transactions causing several internal errors like:
ORA-600 [4193] / ORA-600 [4194] for new transactions
ORA-600 [4137] for a transaction rollback
This Bug is
Fixed in Releases: 10.2.0.5 11.1.0.7.10 11.2.0.1 WIN:A204P40 WIN:B107P42
SOLUTION
Best practice to create a new undo tablespace.
This method includes segment check.
1. Create pfile from spfile to edit
SQL> Create pfile='/tmp/initsid.ora' from spfile;
2. Shutdown the instance
3. set the following parameters in the pfile /tmp/initsid.ora
undo_management = manual
event = '10513 trace name context forever, level 2'
4. SQL>>startup restrict pfile='/tmp/initsid.ora'
5. SQL>select tablespace_name, status, segment_name from dba_rollback_segs where status != 'OFFLINE';
This is critical - we are looking for all undo segments to be offline - System will always be online.
If any are 'PARTLY AVAILABLE' or 'NEEDS RECOVERY' - Please open an issue with Oracle Support or update the current SR. There are many options from this moment and Oracle Support Analyst can offer different solutions for the bad undo segments.
If all offline then continue to the next step
6. Create new undo tablespace - example
SQL>create undo tablespace <new undo tablespace> datafile <datafile> size 2000M;
7. Drop old undo tablespace
SQL>drop tablespace <old undo tablespace> including contents and datafiles;
8. SQL>shutdown immediate;
9 SQL>startup nomount; --> Using your Original spfile
10. Modify the spfile with the new undo tablespace name
SQL> Alter system set undo_tablespace = '<new tablespace created in step 6>' scope=spfile;
11. SQL>shutdown immediate;
12. SQL>startup; --> Using spfile
The reason we create a new undo tablespace first is to use new undo segment numbers that are higher then the current segments being used. This way when a transaction goes to do block clean-out the reference to that undo segment does not exist and continues with the block clean-out.
