看网上都说死归档满了 是刚建立的库 。查看fra 目录还有90%的空闲

1、通常与Redo Log日志文件损坏有关；
2、请提供下alert_SID.log的启动时，报错部分的日志信息;
3、同时将数据库启动到mount状态；执行以下SQL语句，并反馈下
select group#,status from v$log;

oerr ORA 03113
03113, 00000, "end-of-file on communication channel"
// *Cause: The connection between Client and Server process was broken.
// *Action: There was a communication error that requires further investigation.
//          First, check for network problems and review the SQL*Net setup. 
//          Also, look in the alert.log file for any errors. Finally, test to 
//          see whether the server process is dead and whether a trace file
//          was generated at failure time.

1、检查是否存在网络问题
2、检查SQLNET文件配置
3、查看alert日志是否有报错
4、检查是否有数据库进程挂了

查看告警日志
cd $ORACLE_BASE/diag/rdbms/$db_unique_name/ORACLE_SID/trace/ tail -f alert_ORACLE_SID.log
检查一下参数文件