【YashanDB知识库】YashanDB JDBC驱动查询时抛出io fail：Read timed out异常

业务在执行SQL语句时抛出了io fail:Read timed out异常，堆栈如下：

WARN com.yashandb.SessionImpl -- Discarding SQLException on close: This socket has been closed.

com.yashandb.jdbc.exception.YasException: io fail:Read timed out

```js

at com.yashandb.jdbc.exception.SQLError.createSQLException(Unknown Source)

at com.yashandb.protocol.NativeProtocol.receivePacket(Unknown Source)

at com.yashandb.protocol.NativeProtocol.sendCommand(Unknown Source)

at com.yashandb.SessionImpl.a(Unknown Source)

at com.yashandb.SessionImpl.a(Unknown Source)

at com.yashandb.SessionImpl.a(Unknown Source)

at com.yashandb.SessionImpl.b(Unknown Source)

at com.yashandb.SessionImpl.a(Unknown Source)

at com.yashandb.SessionImpl.a(Unknown Source)

at com.yashandb.SessionImpl.execute(Unknown Source)

at com.yashandb.jdbc.PreparedStatementImpl.b(Unknown Source)

at com.yashandb.jdbc.PreparedStatementImpl.executeQuery(Unknown Source)

问题原因：SQL语句的执行时间超过了JDBC连接url参数中socketTimeout指定的时间(单位为秒)，或者是中间件类似参数(例如druid的socket-timeout，单位为毫秒)指定的时间。

解决方案：优化SQL语句减少执行时间或者调大对应的参数设置