Database is very slow

Hi Guys,
I am geting trouble. My database is very slow. I couldn't log in when I launch enterprise manager. I use sqlplus to login on as sys, and it was ok, but it was very slow when I select from v$lock. It is fast when I select from v$session. How can I fix? How can know what database is doing? Thanks.

It is been fixed by our consultant. The reason is memery shortage. The consultant company didn't tell us much more. Thank you guys. Now I checked my system, in v$session_wait view, there are 3 buffer busy waits events there, and in P2Text column, there is a value "Block#". I checked the view of V$waitstat, the result like
data block 4234 1259059
undo header 68169 6811160
is there problem?
in v$system_envents like
buffer busy waits 72994 72950 7953083 109 7,9531E+10
when I select from v$lock, it took long time, finally I cancelled. I coun't use enterprise manager to expand instance tree to see the sessio, very slow and like hang. What's problem? How do I fix it?

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