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sys.dm_qn_subscriptions (Transact-SQL)

Returns information about the active query notifications subscriptions in the server. You can use this view to check for active subscriptions in the server or a specified database, or to check for a specified server principal.

Applies to: SQL Server (SQL Server 2008 through current version).

Column name

Data type

Description

id

int

ID of a subscription.

database_id

int

ID of the database in which the notification query was executed. This database stores information related to this subscription.

sid

varbinary(85)

Security ID of the server principal that created and owns this subscription.

object_id

int

ID of the internal table that stores information about subscription parameters.

created

datetime

Date and time that the subscription was created.

timeout

int

Time-out for the subscription in seconds. The notification will be flagged to fire after this time has elapsed.

Note Note

The actual firing time may be greater than the specified time-out. However, if a change that invalidates the subscription occurs after the specified time-out, but before the subscription is fired, SQL Server ensures that firing occurs at the time that the change was made.

status

int

Indicates the status of the subscription. See the table under remarks for the list of codes.

From

To

On

Type

sys.dm_qn_subscriptions

sys.databases

database_id

Many-to-one

sys.dm_qn_subscriptions

sys.internal_tables

object_id

Many-to-one

The status code of 0 indicates an undefined status.

The following status codes indicate that a subscription fired because of a change:

Code

Minor status

Info

65798

Subscription fired because data changed

Subscription triggered by insert

65799

Subscription fired because data changed

Delete

65800

Subscription fired because data changed

Update

65801

Subscription fired because data changed

Merge

65802

Subscription fired because data changed

Truncate table

66048

Subscription fired because timeout expired

Undefined info mode

66315

Subscription fired because object changed

object or user was dropped

66316

Subscription fired because object changed

object was altered

66565

Subscription fired because database was detached or dropped

server or db restarted

66571

Subscription fired because database was detached or dropped

object or user was dropped

66572

Subscription fired because database was detached or dropped

object was altered

67341

subscription was triggered because of lack od resources on the server

subscription was triggered because of lack od resources on the server

The following status codes indicate that a subscription failed to be created:

Code

Minor status

Info

132609

Subscription creation failed because the statement is not supported

Query is too complex

132610

Subscription creation failed because the statement is not supported

Invalid statement for subscription

132611

Subscription creation failed because the statement is not supported

Invalid set options for subscription

132612

Subscription creation failed because the statement is not supported

Invalid isolation level

132622

Subscription creation failed because the statement is not supported

used internally

132623

Subscription creation failed because the statement is not supported

over the template limit per table

The following status codes are used internally and are classed as check kill and init modes:

Code

Minor status

Info

198656

Used internally: check kill and init modes

Undefined info mode

198928

Subscription was destroyed

Subscription fired because db was attached

198929

Subscription was destroyed

Subscription fired because user was dropped

198930

Subscription was destroyed

Subscription was dropped because of a resubscription

198931

Subscription was destroyed

subscription was killed

199168

Subscription is active

Undefined info mode

199424

Subscription initialized but not yet active

Undefined info mode

Requires VIEW SERVER STATE permission on server.

Note Note

If the user does not have VIEW SERVER STATE permission, this view returns information about subscriptions owned by current user.

A. Return active query notification subscriptions for the current user

The following example returns the active query notification subscriptions of the current user. If the user has VIEW SERVER STATE permissions, all active subscriptions in the server are returned.

SELECT id, database_id, sid, object_id, created, timeout, status
FROM sys.dm_qn_subscriptions;
GO

B. Returning active query notification subscriptions for a specified user

The following example returns the active query notification subscriptions subscribed by login Ruth0.

SELECT id, database_id, sid, object_id, created, timeout, status
FROM sys.dm_qn_subscriptions
WHERE sid = SUSER_SID('Ruth0');
GO

C. Returning internal table metadata for query notification subscriptions

The following example returns the internal table metadata for query notification subscriptions.

SELECT qn.id AS query_subscription_id
    ,it.name AS internal_table_name
    ,it.object_id AS internal_table_id
FROM sys.internal_tables AS it
JOIN sys.dm_qn_subscriptions AS qn ON it.object_id = qn.object_id
WHERE it.internal_type_desc = 'QUERY_NOTIFICATION';
GO
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