故障现象: 数据库无法启动或者cluster系统无法切换。查看数据库日志文件$Oracle_BASE/admin ORCL/bdump/alert_ORCL.log有类似于ORA-01599: failed to acquire rollback segment (49), cache space is full (currently has (48) entries) Error 1599 happened during db open, shutting down database类似的错误信息。