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這篇文章主要介紹 Oracle 如何創建新 undo 表空間，文中介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們一定要看完！
在處理一則 ORA-600 [4194] 案例時，參考 MOS 文檔：Step by step to resolve ORA-600 4194 4193 4197 on database crash (文檔 ID 1428786.1)
1. 對于 ORA 600[4194] 的解釋
2. 創建新 undo 表空間最佳實踐 (包含段檢查)
1. 對于 ORA 600[4194] 的解釋：
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.
可以看到，此錯誤是因為 redo 和 undo 的記錄不匹配。常見于異常斷電等場景。
2. 創建新 undo 表空間最佳實踐 (包含段檢查)
Best practice to create a new undo tablespace.
his method includes segment check.
Create pfile from spfile to edit
SQL Create pfile= /tmp/initsid.ora from spfile;
Shutdown the instance
set the following parameters in the pfile /tmp/initsid.ora
undo_management = manual
event = 10513 trace name context forever, level 2
SQL startup restrict pfile= /tmp/initsid.ora
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
Create new undo tablespace - example
SQL create undo tablespace new undo tablespace datafile datafile size 2000M;
Drop old undo tablespace
SQL drop tablespace old undo tablespace including contents and datafiles;
SQL shutdown immediate;
SQL startup nomount; -- Using your Original spfile
. Modify the spfile with the new undo tablespace name
SQL Alter system set undo_tablespace = new tablespace created in step 6 scope=spfile;
. SQL shutdown immediate;
. SQL startup; -- Using spfile以上是“Oracle 如何創建新 undo 表空間”這篇文章的所有內容，感謝各位的閱讀！希望分享的內容對大家有幫助，更多相關知識，歡迎關注丸趣 TV 行業資訊頻道！
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