在sqlplus username/passwd时遇到以下错误：

exec(): 0509-036 Cannot load program onstat because of the following errors:
0509-130 Symbol resolution failed for /usr/lib/threads/libc.a[aio_64.o]
because:
0509-136 Symbol kaio_rdwr64 (number 0) is not exported from
dependent module /unix.
0509-136 Symbol listio64 (number 1) is not exported from
dependent module /unix.
0509-136 Symbol acancel64 (number 2) is not exported from
dependent module /unix.
0509-136 Symbol iosuspend64 (number 3) is not exported from
dependent module /unix.
0509-136 Symbol aio_nwait (number 4) is not exported from
dependent module /unix.
0509-136 Symbol aio_nwait64 (number 5) is not exported from
dependent module /unix.
0509-136 Symbol aio_nwait_timeout (number 6) is not exported from
dependent module /unix.
0509-136 Symbol aio_nwait_timeout64 (number 7) is not exported from
dependent module /unix.
0509-026 System error: Error 0
0509-192 Examine .loader section symbols with the
'dump -Tv' command.

原因：很可能是系统的aio有没有打开。