Oracle 19c -> Oracle 19c，数据库断开链接

`[INFO] 2022-07-12 20:11:27.046 TaskLogLogger-class org.apache.dolphinscheduler.plugin.task.datax.DataxTask:[66] - -> 2022-07-12 20:11:26.429 [0-0-0-writer] WARN CommonRdbmsWriter$Task - 回滚此次写入, 采用每次写入一行方式提交. 因为:IO Error: Connection timed out (Read failed)
2022-07-12 20:11:26.436 [0-0-0-writer] ERROR WriterRunner - Writer Runner Received Exceptions:
com.alibaba.datax.common.exception.DataXException: Code:[DBUtilErrorCode-05], Description:[往您配置的写入表中写入数据时失败.]. - java.sql.SQLRecoverableException: Closed Connection
at oracle.jdbc.driver.PhysicalConnection.rollback(PhysicalConnection.java:3921)
at com.alibaba.datax.plugin.rdbms.writer.CommonRdbmsWriter$Task.doBatchInsert(CommonRdbmsWriter.java:377)
at com.alibaba.datax.plugin.rdbms.writer.CommonRdbmsWriter$Task.startWriteWithConnection(CommonRdbmsWriter.java:309)
at com.alibaba.datax.plugin.rdbms.writer.CommonRdbmsWriter$Task.startWrite(CommonRdbmsWriter.java:337)
at com.alibaba.datax.plugin.writer.oraclewriter.OracleWriter$Task.startWrite(OracleWriter.java:80)
at com.alibaba.datax.core.taskgroup.runner.WriterRunner.run(WriterRunner.java:56)
at java.lang.Thread.run(Thread.java:748)
- java.sql.SQLRecoverableException: Closed Connection
at oracle.jdbc.driver.PhysicalConnection.rollback(PhysicalConnection.java:3921)
at com.alibaba.datax.plugin.rdbms.writer.CommonRdbmsWriter$Task.doBatchInsert(CommonRdbmsWriter.java:377)
at com.alibaba.datax.plugin.rdbms.writer.CommonRdbmsWriter$Task.startWriteWithConnection(CommonRdbmsWriter.java:309)
at com.alibaba.datax.plugin.rdbms.writer.CommonRdbmsWriter$Task.startWrite(CommonRdbmsWriter.java:337)
at com.alibaba.datax.plugin.writer.oraclewriter.OracleWriter$Task.startWrite(OracleWriter.java:80)
at com.alibaba.datax.core.taskgroup.runner.WriterRunner.run(WriterRunner.java:56)
at java.lang.Thread.run(Thread.java:748)`

Start with the logged stack in com.alibaba.datax.plugin.writer.oraclewriter.OracleWriter and com.alibaba.datax.plugin.rdbms.writer.CommonRdbmsWriter, especially doBatchInsert and startWriteWithConnection. Reproduce the Oracle 19c connection timeout if possible, then trace where the connection closes; done means the failure cause and a verified handling or reproduction are established.

Written by the indexing model from the issue text.