Database in single user mode

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Some times on sql server our database goes to single user mode(upgrade failed)

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And when we tries to make its multi user will get error

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Alter database ntlm-2007-2010-one set multi_user

But sometimes this will not help.

Then you need first find what is your database id

In this case it is 48

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Then run  to find who connected to it.

select * from sys.sysprocesses where dbid=48

And look for  spid

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Then run

Use master

Kill 147

Alter database ntlm-2007-2010-one set multi_user

It will take less than 2 minute.