Difference between emergency state and single user mode ?

Hi,
I want to know the difference between emergency state which we normally use in suspect mode database and single user mode.
Navakanth

Emergency/suspect mode is tells you the state of the database and database is not available for user action but where as single user mode tells the user action preference. Database is active and available for the user action.
You can refer
http://msdn.microsoft.com/en-us/library/bb522682.aspx
EMERGENCY
The database is marked READ_ONLY, logging is disabled, and access is limited to members of the sysadmin fixed server role. EMERGENCY is primarily used for troubleshooting purposes. For example, a database marked as suspect due to a corrupted log file can be
set to the EMERGENCY state. This could enable the system administrator read-only access to the database. Only members of the sysadmin fixed server role can set a database to the EMERGENCY state.
SINGLE_USER
Specifies that only one user at a time can access the database. If SINGLE_USER is specified and there are other users connected to the database the ALTER DATABASE statement will be blocked until all users disconnect from the specified database. To override
this behavior, see the WITH <termination> clause.
The database remains in SINGLE_USER mode even if the user that set the option logs off. At that point, a different user, but only one, can connect to the database.
Before you set the database to SINGLE_USER, verify the AUTO_UPDATE_STATISTICS_ASYNC option is set to OFF. When set to ON, the background thread used to update statistics takes a connection against the database, and you will be unable to access the database
in single-user mode. To view the status of this option, query the is_auto_update_stats_async_on column in the sys.databases catalog view.
If the option is set to ON, perform the following tasks:
Set AUTO_UPDATE_STATISTICS_ASYNC to OFF.
Check for active asynchronous statistics jobs by querying the sys.dm_exec_background_job_queue dynamic management view.
If there are active jobs, either allow the jobs to complete or manually terminate them by using KILL STATS JOB.
--Prashanth

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user13655582 wrote:
Greate example. but i would like add one more point..
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Message was edited by:
tsiboleg

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Thanks & Regards
Prajith P
Moderation: Locked. Please, try to find an answer first. See rules of engagement
Edited by: Joaquin Fornas on Feb 23, 2012 11:14 AM

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===================================
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Message was edited by: prontosystems

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Bala.

>
Bala Shanmuga Priyan wrote:
> Hi all,
>
> I need to know the difference between the two of the below statements
>
>
Tables spfli.
this will create a work area (spfli), looks like DB table spfli, but the statement is obsolate
Bala Shanmuga Priyan wrote:
>
data spfli type spfli with header line.
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