避免数据库连接被耗尽的三种配置

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Last updated on February 15, 2015

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1 自动恢复泄露的数据库连接

在 Admin Console -> JDBC Data Source: Configuration: Connection Pool, 设置 "Inactive Connection Timeout" 大于0的值。

WebLogic Server 会强制回收泄露的连接。有两种泄露情形，一种是应用程序员没有调用 javax.sql.Connection.close() 方法还回连接到连接池。 另外一种是应用程序借得连接后执行的SQL长时间运行没有还回连接池。

Weblogic Server 会输出一个错误信息到日志文件, BEA-001153: Forcibly releasing inactive connection message is written to the server log.

2 设置 SQL Statement Timeout

在 Admin Console -> JDBC Data Source: Configuration: Connection Pool, 设置 "Statement Timeout" 大于 0 的值。

StatementTimeout 依赖于下层的 JDBC driver 实现这个特性. WebLogic Server 通过调用 JDBC driver API java.sql.Statement.setQueryTimeout() 设置 SQL Statement Timeout。当SQL 执行超过这个时长，JDBC driver 抛出异常:java.sql.SQLException: ORA-01013: user requested cancel of current operation to the server log.

3 设置 JDBC Socket Timeout

在 Admin Console -> JDBC Data Source: Configuration: Connection Pool, 设置额外的 "Properties" :

oracle.net.READ_TIMEOUT=30000

oracle.jdbc.ReadTimeout=30000

单位是毫秒, READ_TIMEOUT 适合 11g 以前的 JDBC driver。ReadTimeout适用于 11g 和以后版本  JDBC driver。

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