TNS-12535 TNS-00505的處理方法

硬體說明：

作業系統版本：ORACLE LINUX 6.3  64位

資料庫版本：11.2.0.3   64位

問題說明：

在檢查資料庫的alert日誌的時候，發現大量的12170和TNS-12535的錯誤；

Fatal NI connect error 12170.

  VERSION INFORMATION:

    TNS for Linux: Version 11.2.0.3.0 - Production

    Oracle Bequeath NT Protocol Adapter for Linux: Version 11.2.0.3.0 - Production

    TCP/IP NT Protocol Adapter for Linux: Version 11.2.0.3.0 - Production

  Time: 06-APR-2014 10:46:14

  Tracing not turned on.

  Tns error struct:

    ns main err code: 12535

TNS-12535: TNS:operation timed out

    ns secondary err code: 12560

    nt main err code: 505

TNS-00505: Operation timed out

    nt secondary err code: 110

    nt OS err code: 0

  Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=110.80.1.83)(PORT=50226))

Sun Apr 06 10:46:24 2014

問題解決：

在metalink平臺上面查詢，該症狀和文件 ID （1628949.1）描述的症狀完全一樣，根據文件的內容整理如下：

1、出現問題的版本

Oracle Net Services - Version 11.2.0.3 to 12.1.0.1 [Release 11.2 to 12.1]Information in this document applies to any platform.

2、出現錯誤的症狀或報錯格式如下：

Fatal NI connect error 12170.VERSION INFORMATION:TNS for 64-bit Windows: Version 11.2.0.3.0 - ProductionOracle Bequeath NT Protocol Adapter for 64-bit Windows: Version 11.2.0.3.0 - ProductionWindows NT TCP/IP NT Protocol Adapter for 64-bit Windows: Version 11.2.0.3.0 - ProductionTime: 22-FEB-2014 12:45:09Tracing not turned on.Tns error struct:ns main err code: 12535TNS-12535: TNS:operation timed outns secondary err code: 12560nt main err code: 505TNS-00505: Operation timed outnt secondary err code: 60nt OS err code: 0***Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=121.23.142.141)(PORT=45679))

The PORT field here is the ephemeral port assigned to the client for this connection. This does not correspond to the listener port.

3、問題的原因

The alert.log message indicates that a connection was terminated AFTER it was established to the instance. In this case, it was terminated 2 hours and 3 minutes after the listener handed the connection to the database.

This would indicate an issue with a firewall where a maximum idle time setting is in place.

The connection would not necessarily be "idle". This issue can arise during a long running query or when using JDBC Thin connection pooling. If there is no data 'on the wire' for lengthy

periods of time for any reason, the firewall might terminate the connection.

4、解決方法：

The following parameter, set at the **RDBMS_HOME/network/admin/sqlnet.ora, can resolve this kind of problem. DCD or SQLNET.EXPIRE_TIME can mimic data transmission between the server and the client during long periods of idle time. SQLNET.EXPIRE_TIME=n Where <n> is a non-zero value set in minutes. 

進入ORACLE_HOME/network/admin目錄下，新增sqlnet.ora檔案，增加一行SQLNET.EXPIRE_TIME=10

5、補充說明SQLNET.EXPIRE_TIME

Purpose

To specify a time interval, in minutes, to send a check to verify that client/server connections are active. The following usage notes apply to this parameter:

• Setting a value greater than 0 ensures that connections are not left open indefinitely, due to an abnormal client termination.
• If the probe finds a terminated connection, or a connection that is no longer in use, then it returns an error, causing the server process to exit.
• This parameter is primarily intended for the database server, which typically handles multiple connections at any one time.
• Limitations on using this terminated connection detection feature are:
  • It is not allowed on bequeathed connections.
  • Though very small, a probe packet generates additional traffic that may downgrade network performance.
  • Depending on which operating system is in use, the server may need to perform additional processing to distinguish the connection probing event from other events that occur. This can also result in degraded network performanc

6、做完以上操作後，重啟資料庫的監聽；

詳細的metalink連結 ：https://support.oracle.com/epmos/faces/DocumentDisplay?id=1628949.1

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