HELP!! Please! My 'session' table just disappeared.

[mdreamer]

Hi,

I need urgent help. 12 hours ago my 'session' table just disappeared. for no apparent reason, I didn't upgrade anything or change It looks like the rest of the DB is ok but i won't know for sure until everything will be online again with no DB errors.

I have a back up of 2 weeks ago that I really don't want to use.. it means to lose a lot of info.

Here is the error:

Database error in vBulletin 4.1.10:

Invalid SQL:

SELECT *
FROM session
WHERE userid = 0
AND host = '66.249.68.99'
AND idhash = 'c827199bec48e24e5059338869b06bed'
LIMIT 1;

MySQL Error : Table 'MyDB.session' doesn't exist
Error Number : 1146
Request Date : Sunday, February 26th 2012 @ 01:01:13 PM
Error Date : Sunday, February 26th 2012 @ 01:01:13 PM
Script :
Referrer :
IP Address : 66.249.68.99
Username :
Classname : vB_Database
MySQL Version :

i
What can cause that? Is this table contains temporary data? What can I do?

Please help me