一．Alert log 說明
在Oracle 11.2.0.2 的數據庫中alert log發現大量如下log：
Fatal NI connect error 12537, connectingto:
(LOCAL=NO)
VERSION INFORMATION:
TNS for HPUX: Version 11.2.0.2.0 - Production
Oracle Bequeath NT Protocol Adapter for HPUX: Version 11.2.0.2.0 -Production
TCP/IP NT Protocol Adapter for HPUX: Version 11.2.0.2.0 - Production
Time: 11-SEP-2011 17:03:56
Tracing not turned on.
Tnserror struct:
nsmain err code: 12537
TNS-12537: TNS:connection closed
ns secondary err code: 12560
nt main err code: 0
nt secondary err code: 0
nt OS err code: 0
opiodr aborting process unknown ospid (29942) as a result of ORA-609
Sun Sep 11 17:05:23 2011
Tue Sep 13 17:56:37 2011
opiodr aborting processunknown ospid (924) as a result of ORA-28
Tue Sep 13 17:56:38 2011
opiodr aborting process unknownospid (1951) as a result of ORA-28
Tue Sep 13 17:56:40 2011
opiodr aborting process unknown ospid(1983) as a result of ORA-28
Tue Sep 13 17:56:42 2011
opiodr aborting process unknown ospid(11149) as a result of ORA-28
Tue Sep 13 17:56:43 2011
opiodr aborting process unknown ospid(17662) as a result of ORA-28
Tue Sep 13 17:58:06 2011
opidcl aborting process unknown ospid(9702) as a result of ORA-604
二．問題分析：
2.1 opiodr aborting process unknown ospid (924) as a resultof ORA-28
在Oracle 11.1.0.6 和 11.1.0.7 的版本中，存在一個bug：6377339。 其會在alert log 顯示如下信息：
ORA-28 : opiodr aborting process unknown ospid (21016_3086862016)
這樣的提示信息會讓我們產生疑惑. 所以在Oracle 11.2 版本中對這個bug進行修復，修復之后的提示信息變成了：
opidcl abortingprocess unknown ospid (32110) as a result of ORA-28
opiodr aborting process信息僅僅是一個消息，它是Oracle 11g里新添加的一個消息，用來記錄進程的異常退出。
該消息一般用來記錄有權限的用戶kill 的session信息。
示例：
"opiodr aborting process unknown ospid(28342) as a result of ORA-28"
解釋：
"unknown" => means it is not abackground or shadow process that is killed
"ospid (28342)" => this is the OS pid of the process which opiodris aborting
"as a result of" => this precedes the error message which is thereason for opiodr to kill the process
"ORA-28" => this is the reason that opiodr killed the process. Inthis case, it is ora-28.
參考：
"opiodr abortingprocess" Messages in Alert.Log [ID 1230858.1]
Bug 6377339 - Misleading alertlog message for "opiodr aborting" [ID 6377339.8]
2.2 opiodr aborting process unknown ospid (29942) as a resultof ORA-609
這里表示進程ospid (29942) 因為ORA-609的錯誤而被kill。導致這個錯誤的原因有2種：
（1） Bug9856585 - "audit network by access does not audit ora-12650"
該bug 存在Oracle 11.1 到 11.2 的版本中，官網對這個bug的說明如下：
The Bug9856585 is going to be fix bythe Oracle RDBMS Development team, it is currently in Work in Progress Status.
（2）在啟動 EM Console后報該錯誤，該問題存在Oracle 10.1到11.2.可能是nscd 進程引起。解決方法是重啟這個進程。
用超級用戶（root）用戶執行以下步驟進行重啟：
1. Stop nscd daemon:
# service nscd stop
2. Verify if any rogue processes is still running:
# ps -ef|grep nscd
If any process is found, kill the roguenscd process
# kill -9 <nscd_pid>
3. Start nscd daemon:
# service nscd start
4. As the OS user who has installed theAgent, start the Agent:
cd <AGENT_HOME>/bin
emctl start agent
參考：
Audit Network Does Not Work When notSuccessful in Oracle 11gR2 [ID 1241325.1]
Grid Control Agent 10.2 Crashes with CoreDump if 'nscd' daemon is Hung on Linux OS [ID 430200.1]
Lsnrctl Status is Failing and Alert.logShows TNS-12537 and ORA-609 [ID 950135.1]
2.3 opidcl aborting process unknown ospid (9702) asa result of ORA-604
根據2.1 中的說明，這里的信息時記錄了ospid(9702) 進程因為ORA-604的錯誤而被中斷了。 該消息僅用來記錄進程異常退出的信息，是Oracle 11g中新增加的消息。
三．小結：
在Oracle 11g中，新增了一個新的消息機制，會在alert log中記錄異常退出的進程。
其消息格式示例如下：
"opiodr aborting process unknown ospid(28342) as a result of ORA-28"
解釋：
"unknown" => means it is not abackground or shadow process that is killed
"ospid (28342)" => this is the OS pid of the process which opiodris aborting
"as a result of" => this precedes the error message which is thereason for opiodr to kill the process
"ORA-28" => this is the reason that opiodr killed the process. Inthis case, it is ora-28.
這個是Oracle 11.2 以后的格式，在11.2 之前的格式：
ORA-28 : opiodr aborting process unknownospid (21016_3086862016)
這種格式因為會讓人迷惑，因此該格式被稱為Bug 6377339，並在11.2中修改了這個格式。
Alert log中的"opiodr aborting processunknown ospid (28342) as a result of ORA-28"消息僅僅是一個記錄信息。最后的ORA-XX的信息代表導致進程異常退出的原因。
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