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sp_helptracertokenhistory (Transact-SQL)

  • Artikkeli

Applies to: SQL Server Azure SQL Managed Instance

Returns detailed latency information for specified tracer tokens, with one row being returned for each Subscriber. This stored procedure is executed at the Publisher on the publication database or at the Distributor on the distribution database.

Transact-SQL syntax conventions

Syntax

sp_helptracertokenhistory
    [ @publication = ] N'publication'
    , [ @tracer_id = ] tracer_id
    [ , [ @publisher = ] N'publisher' ]
    [ , [ @publisher_db = ] N'publisher_db' ]
[ ; ]

Arguments

[ @publication = ] N'publication'

The name of the publication in which the tracer token was inserted. @publication is sysname, with no default.

[ @tracer_id = ] tracer_id

The ID of the tracer token in the MStracer_tokens table, for which history information is returned. @tracer_id is int, with no default.

[ @publisher = ] N'publisher'

The name of the Publisher. @publisher is sysname, with a default of NULL.

@publisher should only be specified for non-SQL Server Publishers.

[ @publisher_db = ] N'publisher_db'

The name of the publication database. @publisher_db is sysname, with a default of NULL. This parameter is ignored if the stored procedure is executed at the Publisher.

Result set

Column name Data type Description
distributor_latency bigint Number of seconds between the tracer token record being committed at the Publisher and the record being committed at the Distributor.
subscriber sysname Name of the Subscriber that received the tracer token.
subscriber_db sysname Name of the subscription database into which the tracer token record was inserted.
subscriber_latency bigint Number of seconds between the tracer token record being committed at the Distributor and the record being committed at the Subscriber.
overall_latency bigint Number of seconds between the tracer token record being committed at the Publisher and token record being committed at the Subscriber.

Return code values

0 (success) or 1 (failure).

Remarks

sp_helptracertokenhistory is used in transactional replication.

Execute sp_helptracertokens to obtain a list of tracer tokens for the publication.

A value of NULL in the result set means that latency statistics can't be calculated. This is because the tracer token hasn't been received at the Distributor or one of the Subscribers.

Examples

DECLARE @publication AS sysname;
DECLARE @tokenID AS int;
SET @publication = N'AdvWorksProductTran'; 

USE [AdventureWorks2022]

-- Insert a new tracer token in the publication database.
EXEC sys.sp_posttracertoken 
  @publication = @publication,
  @tracer_token_id = @tokenID OUTPUT;
SELECT 'The ID of the new tracer token is ''' + 
    CONVERT(varchar,@tokenID) + '''.'
GO

-- Wait 10 seconds for the token to make it to the Subscriber.
WAITFOR DELAY '00:00:10';
GO

-- Get latency information for the last inserted token.
DECLARE @publication AS sysname;
DECLARE @tokenID AS int;
SET @publication = N'AdvWorksProductTran'; 

CREATE TABLE #tokens (tracer_id int, publisher_commit datetime)

-- Return tracer token information to a temp table.
INSERT #tokens (tracer_id, publisher_commit)
EXEC sys.sp_helptracertokens @publication = @publication;
SET @tokenID = (SELECT TOP 1 tracer_id FROM #tokens
ORDER BY publisher_commit DESC)
DROP TABLE #tokens

-- Get history for the tracer token.
EXEC sys.sp_helptracertokenhistory 
  @publication = @publication, 
  @tracer_id = @tokenID;
GO

Permissions

Only members of the sysadmin fixed server role, the db_owner fixed database role in the publication database, or db_owner fixed database or replmonitor roles in the distribution database can execute sp_helptracertokenhistory.

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