执行INFORMIX命令出错？

oicq63236

刚开始用onstat - 来查看数据库状态，出现以下信息
onstat -
21:03:10  shmat: [22]: operating system error
21:03:10  Client could not attach server shared memory segment, use IFX_XFER_SH.
onstat: Cannot attach to shared memory. errno = 22

关闭数据库时出现
onmode -ky
23:40:28  shmat: [22]: operating system error
23:40:28  Client could not attach server shared memory segment, use IFX_XFER_SHM
BASE.
onmode: Shutdown of the database server shall be done by killing
       the database server processes, as the database server is
       in Initialization mode and cannot accept onmode commands.
Segmentation fault

后边大约12点多，另一位同事来看，直接执行
onstat -则可以正常执行
然后onmode -ky也正常

大哥们可不可以说说这是什么原因造成的呢？