EnumQueueReaderAgentSessions Method

后续版本的 Microsoft SQL Server 将删除该功能。 请避免在新的开发工作中使用该功能，并着手修改当前还在使用该功能的应用程序。

The EnumQueueReaderAgentSessions method returns a QueryResults object that enumerates execution status data about Queue Reader Agent sessions operating on the specified publication.

语法

object.EnumQueueReaderAgentSessions(lPublicationID,SessionType,SessionDuration,lEstimatedNumRecords )asQueryResults

Parts

• object
  Expression that evaluates to an object in the Applies To list.

• lPublicationID
  Long integer that identifies the publication by ID.

• SessionType
  SQLDMO_SESSION_TYPE constant that indicates the session type as described in Settings.

• SessionDuration
  Long integer that specifies the number of hours. Restricts result set membership to those sessions launched within the specified number of hours. Use 0 to specify no restriction on agent session start time.

• lEstimatedNumRecords
  Long integer that specifies the estimated number of QueryResults rows to return.

Prototype (C/C++)

HRESULT EnumQueueReaderAgentSessions(
long lPublicationID, 
SQLDMO_SESSION_TYPE SessionType, 
long SessionDuration, 
long lEstimatedNumRecords,
LPSQLDMOQUERYRESULTS *ppResults);

Settings

Set SessionType using these values.

Constant	Value	Description
SQLDMOSession_All	1	Output contains log information for all sessions for agent.
SQLDMOSession_Errors	2	Output contains log information only for those execution attempts ending in error.

Returns

A QueryResults object that contains one result set defined by these columns.

Column	Data type	Description
action_count	integer	Total number of session details.
average_commands	integer	Average number of commands.
commands_processed	integer	Cumulative number of commands processed in the session.
comments	nvarchar(255)	Descriptive text.
delivery_latency	integer	Latency, in milliseconds, between a transaction entering the queue and being applied to the Publisher.
delivery_rate	integer	Average number of commands delivered per second.
duration	integer	Elapsed time of the logged session activity in seconds.
error_id	integer	When nonzero, indicates a Microsoft SQL Server error message number.
publication_id	integer	Publication identifier.
start_time	nvarchar(24)	Date and time at which agent session started.
status	integer	Queue Reader Agent status.
time	nvarchar(24)	Date and time of last logged message.
transactions_processed	integer	Cumulative number of transactions processed in the session.

注释

In the result set, date and time data returned in start_time and time are formatted as YYYYMMDD hh:mm:ss.fff.

Date part	Description
YYYY	Represents the year in four digits.
MM	Represents the month in two digits (zero padded).
DD	Represents the day of the month in two digits (zero padded).
hh	Represents the hour using two digits, a twenty-four hour clock (zero padded).
mm	Represents the minute in two digits (zero padded).
ss	Represents the second in two digits (zero padded).
fff	Represents the fractional part of the second in three digits.

For example, the value 20040512 18:12:00.000 is interpreted as 6:12 P.M., May 12, 2004.

The EnumQueueReaderAgentSessions method includes the lEstimatedNumRecords parameter, which allows an application to pass an estimated number of QueryResults rows. This allows the application to avoid the performance overhead associated with repeatedly allocating and freeing memory.

注意
If an application calls EnumQueueReaderAgentSessionson an instance of SQL Server version 7.0, the constant, SQLDMO_E_SQL80ONLY, and the message "This property or method requires Microsoft SQL Server 2000 or later" are returned.

Applies To:

DistributionDatabase2 Object