Question

我们零星地发现这一错误。有了同样的土耳其航天中心,我们就能够与数据库建立适当联系。但是,我们在记录中看到这一点,同时有时建立联系。以下是 st痕。这是一种与Oracle的连接,它来自Liberat机器和java的申请。

java.sql.SQLException: Io exception: The Network Adapter could not establish the connection at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112) at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146) at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:255) at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:387) at oracle.jdbc.driver.PhysicalConnection.(PhysicalConnection.java:439) at oracle.jdbc.driver.T4CConnection.(T4CConnection.java:165) at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35) at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801) at oracle.jdbc.pool.OracleDataSource.getPhysicalConnection(OracleDataSource.java:297) at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:221) at oracle.jdbc.pool.OracleConnectionPoolDataSource.getPhysicalConnection(OracleConnectionPoolDataSource.java:157) at oracle.jdbc.pool.OracleConnectionPoolDataSource.getPooledConnection(OracleConnectionPoolDataSource.java:94) at oracle.jdbc.pool.OracleImplicitConnectionCache.makeCacheConnection(OracleImplicitConnectionCache.java:1567) at oracle.jdbc.pool.OracleImplicitConnectionCache.getCacheConnection(OracleImplicitConnectionCache.java:478) at oracle.jdbc.pool.OracleImplicitConnectionCache.getConnection(OracleImplicitConnectionCache.java:347) at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:404) at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:189) at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:165)

Answer 1

审判

(obvious) IP address is incorrect - try PING
The port is not open, or is blocked by a firewall - try TELNET
The DB listener is not running or is binding to a different network interface - again, TELNET should confirm this (also use Oracle client tools to connect)
No local ports are available for the out-going connection (unlikely) - only if you re making thousands of connections, or creating hundreds of new connections every minute.

Answer 2

Seems the connection pool runs out of connections... When DBMS listener s incoming request buffer is overloaded by many simultaneous connection requests. It will fail some of them.

您可以在接连申请之间睡觉(双向二等)。之后,在重新中断之前不会有密切的联系。保留和重新使用。

Answer 3

https://forums.oracle.com/forums/thread.jspa?messageID=2540479, 或许你们必须改变听众,将ora户口号的座标贴在座标旁。您可以核实,什么参数是你在窗户、碎块和大街上的主名;

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