我在将 JDBC 连接到 Oracle 11g 时遇到了这个奇怪的问题。它在本周一突然开始发生,而我或团队都没有意识到任何设置更改。阅读 Stackoverflow 和 Oracle 论坛(请参阅底部的链接),我了解到在 64 位 linux 机器上生成随机字节存在问题。这让我尝试了几件事,不幸的是没有奏效。这是我所知道的所有信息的摘要。
奇怪的是 ,我可以使用 sqlplus 通过终端连接,但不能使用 JDBC。
感谢您的任何想法或帮助,
阿米特
我的设置:
OS: Ubuntu 12.04
Java: Both 7 and 6_45 (Issue is the same)
JDBC: Downloaded from the Oracle official site (see further description down)
Connection behind a Cisco VPN
JDBC list :
odbc7.jar:
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.7.1
Created-By: 20.12-b01 (Sun Microsystems Inc.)
Implementation-Vendor: Oracle Corporation
Implementation-Title: JDBC
Implementation-Version: 12.1.0.1.0
Repository-Id: JAVAVM_12.1.0.1.0_LINUX.X64_130403
Specification-Vendor: Sun Microsystems Inc.
Specification-Title: JDBC
Specification-Version: 4.0
Main-Class: oracle.jdbc.OracleDriver
sealed: true
Name: oracle/sql/converter/
Sealed: false
Name: oracle/sql/
Sealed: false
Name: oracle/sql/converter_xcharset/
Sealed: false
odbc6.jar:
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.7.1
Created-By: 20.12-b01 (Sun Microsystems Inc.)
Implementation-Vendor: Oracle Corporation
Implementation-Title: JDBC
Implementation-Version: 12.1.0.1.0
Repository-Id: JAVAVM_12.1.0.1.0_LINUX.X64_130403
Specification-Vendor: Sun Microsystems Inc.
Specification-Title: JDBC
Specification-Version: 4.0
Main-Class: oracle.jdbc.OracleDriver
sealed: true
Name: oracle/sql/converter/
Sealed: false
Name: oracle/sql/
Sealed: false
Name: oracle/sql/converter_xcharset/
Sealed: false
星期五一切都还在工作:
使用 SQLPLUS 的终端连接正在工作:
amit@mymachine:/usr/lib/oracle$ sqlplus/@DB_HOST_IP:1521/DB_NAME
SQL*Plus:2014 年 4 月 22 日星期二 11:35:58 发布 12.1.0.1.0 生产版
版权所有 (c) 1982, 2013,甲骨文。版权所有。
连接到:
Oracle 数据库 11g 版本 11.2.0.3.0 - 64 位生产
查询>
但是与 JDBC 的连接失败了:
DriverManager.getConnection(
"jdbc:oracle:thin:@//DB_HOST_IP:1521/DB_NAME", username,
password);
挂起约 20 秒并抛出:
ava.sql.SQLRecoverableException: IO Error: Connection reset
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:682)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:711)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:385)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:30)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:558)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at OracleJDBC.main(OracleJDBC.java:32)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:168)
at oracle.net.ns.Packet.receive(Packet.java:311)
at oracle.net.ns.DataPacket.receive(DataPacket.java:105)
at oracle.net.ns.NetInputStream.getNextPacket(NetInputStream.java:305)
at oracle.net.ns.NetInputStream.read(NetInputStream.java:249)
at oracle.net.ns.NetInputStream.read(NetInputStream.java:171)
at oracle.net.ns.NetInputStream.read(NetInputStream.java:89)
at oracle.jdbc.driver.T4CSocketInputStreamWrapper.readNextPacket(T4CSocketInputStreamWrapper.java:123)
at oracle.jdbc.driver.T4CSocketInputStreamWrapper.read(T4CSocketInputStreamWrapper.java:79)
at oracle.jdbc.driver.T4CMAREngineStream.unmarshalUB1(T4CMAREngineStream.java:426)
at oracle.jdbc.driver.T4C8TTIdty.receive(T4C8TTIdty.java:688)
at oracle.jdbc.driver.T4C8TTIdty.doRPC(T4C8TTIdty.java:595)
at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1439)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:486)
... 12 more
从服务器的日志:
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: 22-APR-2014 09:57:45
Tracing not turned on.
Tns error struct:
ns main err code: 12535
TNS-12535: TNS:operation timed out
ns secondary err code: 12606
nt main err code: 0
nt secondary err code: 0
nt OS err code: 0
Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=<my.ip.address>)(PORT=42738))
从关于两个服务器错误的 Oracle 文档中:
ORA-12535: TNS:operation timed out
Cause: The requested operation could not be completed within the time out period.
Action: Look at the documentation on the secondary errors for possible remedy. See SQLNET.LOG to find secondary error if not provided explicitly. Turn on tracing to gather more information.
ORA-12606: TNS: Application timeout occurred
Cause: A network session did not reach an application-defined stage within the allowed time interval.
Action: This is an error which does not normally appear at the high level. The action to take is application specific, and is detailed in the higher level error description.
我尝试过的解决方案:
-Djava.security.egd=file:///dev/urandom
。 -Djava.security.egd
参数如何: int a = 10000; while (a-- > 0){ byte[] array = new byte[2048]; new SecureRandom().nextBytes(array); System.out.println(a); }
以上似乎都没有改变错误(超时)。
编辑: 新尝试:
SQL> select secure_params from session_token where id=11065073;
重启客户端,
越来越多地更新此特定行中的此字段,如果该字段的大小为 429 个字符,我仍然可以读取该字段,但是当我将其增加到 587 个字符时,它又卡住了。
SQL> select length( secure_params) from session_token where id=11065073;
LENGTH(SECURE_PARAMS)
---------------------
587
SQL> select secure_params from session_token where id=11065073;
第 4 次尝试让我想到这里可能存在其他问题,因为应用程序能够创建初始连接并从数据库中获取一些短数据,但只有在结果集变得有点胖时才会失败。
编辑结束
链接:
堆栈溢出:Oracle JDBC intermittent Connection Issue
Rng 熵生成器:http://www.howtoforge.com/helping-the-random-number-generator-to-gain-enough-entropy-with-rng-tools-debian-lenny
最佳答案
ORA-12170 表示与数据库监听器的 TCP 连接失败。
如果这是一直发生的错误,请检查防火墙和网络 ACL。可能是中间人发生了变化?
或者,它可能是影响 TCP 连接的一些其他工件,例如 IP 地址冲突。我最近自己也遇到了这个问题,并在 http://distracted-it.blogspot.co.nz/2014/04/ora-12170-tnsconnect-timeout-resolved.html 上写了博客
希望能帮助到你。