启动时,报错了.... 求解~

ALLSTARS_ORACLE

做的异机恢复, restore database 已经执行完,重建了控制文件后,startup, 报如下错误

ORA-00604: error occurred at recursive SQL level 1
ORA-01555: snapshot too old: rollback segment number 126 with name "_SYSSMU126$" too small
Error 604 happened during db open, shutting down database
USER: terminating instance due to error 604
Instance terminated by USER, pid = 3030
ORA-1092 signalled during: ALTER DATABASE OPEN...