今天線上數據庫（版本11.2.0.1）無法建立新連接，但原有的連接不受影響，alert.log報如下錯誤：
opiodr aborting process unknown ospid (22997) as a result of ORA-609
但在listener.log裡卻顯示連接已建立
03-APR-2014 16:05:44 * (CONNECT_DATA=(SERVICE_NAME=orcl2.localdomain)(CID=(PROGRAM=python@lx151)(HOST=lx151)(USER=gl))) * (ADDRESS=(PROTOCOL=tcp)(HOST=10.10.100.151)(PORT=52903)) *establish * orcl2.localdomain * 0
在sqlnet.log裡報12537錯誤
Fatal NI connect error 12537, connecting to:
(LOCAL=NO)
VERSION INFORMATION:
TNS for Linux: Version 11.2.0.1.0 - Production
Oracle Bequeath NT Protocol Adapter for Linux: Version 11.2.0.1.0 - Production
TCP/IP NT Protocol Adapter for Linux: Version 11.2.0.1.0 - Production
Time: 03-APR-2014 15:24:30
Tracing not turned on.
Tns error struct:
ns main err code: 12537
TNS-12537: TNS:connection closed
ns secondary err code: 12560
nt main err code: 0
nt secondary err code: 0
當用lsnrctl status查看監聽器狀態時，卡住
通過查詢官方文檔，知道這是個bug，後來根據網上搜索的解決辦法，鏈接：http://forums.oracle.com/forums/thread.jspa?messageID=4489745
刪除主機文件/etc/resolv.conf，果然恢復了，具體原因不清楚，這只是一個臨時的解決辦法，要想徹底解決，應該要升級。
