| use master go sp_configure ’allow updates’,1 reconfigure with override go | 
| update sysdatabases set status=32768 where hame=’aaa’ | 
| sp_dboption ’aaa’, ’single user’, ’true’ | 
| dbcc checkdb(’aaa’) | 
| update sysdatabases set status=28 where name=’aaa’ sp_configure ’allow updates’,0 reconfigure with override go | 
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