How to fix the error in my database?

Hi,

I have a database. I can attach it to SQL Server with Management Studio and perform query on the tables. But when I run the following commands:

ALTER DATABASE UFDATA_008_2013 SET SINGLE_USER;

DBCC CHECKDB('UFDATA_008_2013',  REPAIR_REBUILD);

I will get the following errors:

Msg 8921，Level 16，State 1，Line # 3

Check terminated. A failure was detected while collecting facts. Possibly tempdb out of space or a system table is inconsistent. Check previous errors.

Msg 605，Level 21，State 3，Line # 3

Attempt to fetch logical page (1:209549) in database 6 failed. It belongs to allocation unit 72057600521535488 not to 281474979397632.

I then try with the following commands by switch to emergency mode and invoke checkdb with REPAIR_ALLOW_DATA_LOSS, but still get the above error messages:

ALTER DATABASE UFDATA_008_2013 SET EMERGENCY;

ALTER DATABASE UFDATA_008_2013 SET SINGLE_USER;

DBCC CHECKDB('UFDATA_008_2013',  REPAIR_ALLOW_DATA_LOSS);

ALTER DATABASE UFDATA_008_2013 SET MULTI_USER;

How to fix the problem? I do NOT have a backup of the database.

Thank you very much.