SQL> startup nomount
ORA-04031: unable to allocate 520 bytes of shared memory ("shared pool","unknown            object","sga heap(1,0)","Detached dump directory")
ORA-00600: internal error code, arguments: [SKGMINVALID], [21], [0], [0], [0], [
           ], [], []
SQL>我一运行就那个命令就出现错误了,如何解决啊!