oracle解除锁表【原】

在日常操作中,经常会有不小心被锁表的情况发生

一般造成原因有:

• 开发人员不小心执行了 for update 查询语句后,没有解锁
• 不合理代码中开启事务(begin transaction)后,没有关闭(close)或回滚(rollback)该事务.

此时我们必须拥有dba的权限才能对被锁的表进行解锁操作.而锁表的时如果突然断网或断电那么可能会报如下异常:

Exception in thread "Thread-4" org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database.  Cause: java.sql.SQLException: Io 异常: Connection reset
### The error may exist in file [D:\application\eclipse64ee\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp7\wtpwebapps\isc\WEB-INF\classes\com\testdemo\pcis\isc\dao\LockMapper.xml]
### The error may involve com.testdemo.pcis.isc.dao.LockMapper.queryLockTableForUpdate-Inline
### The error occurred while setting parameters
### SQL: SELECT T.C_PK_ID as cId, T.C_IP as cIP,T.C_MEMO as cMemo ,T.T_CRT_TM as tCrtTm FROM WEB_ISC_LOCK T  FOR UPDATE
### Cause: java.sql.SQLException: Io 异常: Connection reset
    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:150)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)
    at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:128)
    at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:68)
    at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)
    at com.sun.proxy.$Proxy24.queryLockTableForUpdate(Unknown Source)
    at com.testdemo.pcis.isc.threadpool.MasterSlaveThread.judgeMasterNewCode(MasterSlaveThread.java:73)
    at com.testdemo.pcis.isc.threadpool.MasterSlaveThread.run(MasterSlaveThread.java:54)
Caused by: java.sql.SQLException: Io 异常: Connection reset
    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.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:829)
    at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1049)
    at oracle.jdbc.driver.T4CPreparedStatement.executeMaybeDescribe(T4CPreparedStatement.java:854)
    at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1154)
    at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3370)
    at oracle.jdbc.driver.OraclePreparedStatement.execute(OraclePreparedStatement.java:3476)
    at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:172)
    at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:172)
    at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:63)
    at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)
    at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63)
    at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:325)
    at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
    at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
    at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)
    ... 7 more

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