MySQL迁移时报错:Unable to connect to the database server. Cause: connect timed out。这种情况是由于表数据量较大,并且源端通过where语句过滤,但并非索引列,或列值不离散,查询会全表扫描,导致JDBC连接超时。例如图1所示c_date字段为非索引列。优先联系DBA修改
Oracle JDBC及ConnectTimeout参数的作用: Oracle JDBC:Oracle JDBC(Java Database Connectivity)是Java语言编写的应用程序与Oracle数据库之间的连接标准。它允许Java应用程序通过JDBC API与Oracle数据库进行交互,执行SQL语句、处理结果集等。 ConnectTimeout参数:ConnectTimeout参数用于指定数据库连接请求的超时时间(以秒为...
The following error message is displayed during MySQL migration: "Unable to connect to the database server. Cause: connect timed out."The table has a large data volume, a
MESSAGE: java.net.ConnectException: Connection timed out: connect STACKTRACE: java.net.SocketException: java.net.ConnectException: Connection timed out: connect at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:156) at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:276) at com.m...
connect timeout就是tcp连接超时 其中又分两种,一种是超过了自己设置的连接超时时间 一种是tcp层面连接sync包报文达到了重试次数报的超时, 两种超时错误提示信息是不一样的。 2.2 interactive_timeout & wait_timeout wait_timeout和interactive_timeout都是指不活跃的连接超时时间,连接线程启动的时候wait_timeout会...
1.普通的 JDBC 链接 public class JdbcConnect { @Test public void connect() throws Class...
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:344) at java.sql.DriverManager.getConnection(DriverManager.java:571) at java.sql.DriverManager.getConnection(DriverManager.java:215) at test.main(test.java:17) Caused by: java.net.ConnectException: Connection timed out: connect ...
Caused by: java.net.ConnectException: Connection timed out: connect ... 2. 修改防火墙和其他内容后报错 在本文 4.5 都做完后,本机触发了新的报错,如下: Exception in thread "main" java.sql.SQLException: Access denied for user 'root'@'192.168.24.1' (using password: YES) ...
at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:310)~[tomcat-jdbc-8.5.6.jar:na]at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:203)~[tomcat-jdbc-8.5.6.jar:na]at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(...
resultSet的next方法不受queryTimeout参数的影响,应该是受最底层的socketTimeout影响 queryTimeout会新建一个cancelTask并使用Timer调度,如果超时了则执行cancel动作 如果queryTimeoutKillsConnection则kill连接,否则发送kill query命令,同时标记状态,然后抛出MySQLTimeoutException异常. executeQuery没有超时,则会cancel掉这个tim...