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How to: Configure Snapshot Properties (Replication Transact-SQL Programming)

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Snapshot properties can be defined and modified programmatically using replication stored procedures, where the stored procedures used depend on the type of publication.

To configure snapshot properties when creating a snapshot or transactional publication

  1. At the Publisher, execute sp_addpublication. Specify a publication name for @publication, a value of either snapshot or continuous for @repl_freq, and one or more of the following snapshot-related parameters:

    • @alt_snapshot_folder - specify a path if the snapshot for this publication is accessed from that location instead of or in addition to the snapshot default folder.
    • @compress_snapshot - specify a value of true if the snapshot files in the alternate snapshot folder are compressed in the Microsoft CAB file format.
    • @pre_snapshot_script - specify the file name and full path of a .sql file that will be executed at the Subscriber during initialization before the initial snapshot is applied.
    • @post_snapshot_script - specify the file name and full path of a .sql file that will be executed at the Subscriber during initialization after the initial snapshot is applied.
    • @snapshot_in_defaultfolder - specify a value of false if the snapshot is available only in a non-default location.

    For more information about creating publications, see How to: Create a Publication (Replication Transact-SQL Programming).

To configure snapshot properties when creating a merge publication

  1. At the Publisher, execute sp_addmergepublication. Specify a publication name for @publication, a value of either snapshot or continuous for @repl_freq, and one or more of the following snapshot-related parameters:

    • @alt_snapshot_folder - specify a path if the snapshot for this publication is accessed from that location instead of or in addition to the snapshot default folder.
    • @compress_snapshot - specify a value of true if the snapshot files in the alternate snapshot folder are compressed in the CAB file format.
    • @pre_snapshot_script - specify the file name and full path of a .sql file that will be executed at the Subscriber during initialization before the initial snapshot is applied.
    • @post_snapshot_script - specify the file name and full path of a .sql file that will be executed at the Subscriber during initialization after the initial snapshot is applied.
    • @snapshot_in_defaultfolder - specify a value of false if the snapshot is available only in a non-default location.

  2. For more information about creating publications, see How to: Create a Publication (Replication Transact-SQL Programming).

To modify snapshot properties of an existing snapshot or transactional publication

  1. At the Publisher on the publication database, execute sp_changepublication. Specify a value of 1 for @force_invalidate_snapshot and one of the following values for @property:

    • alt_snapshot_folder -also specify a new path to the alternate snapshot folder for @value.
    • compress_snapshot - also specify a value of either true or false for @value to indicate whether the snapshot files in the alternate snapshot folder are compressed in the CAB file format.
    • pre_snapshot_script - also for @value specify the file name and full path of a .sql file that will be executed at the Subscriber during initialization before the initial snapshot is applied.
    • post_snapshot_script - also for @value specify the file name and full path of a .sql file that will be executed at the Subscriber during initialization after the initial snapshot is applied.
    • snapshot_in_defaultfolder - also specify a value of either true or false to indicate whether the snapshot is available only in a non-default location.

  2. (Optional) At the Publisher on the publication database, execute sp_changepublication_snapshot. Specify @publication and one or more of the scheduling or security credential parameters being changed.

    ms147379.security(ru-ru,SQL.90).gifПримечание безопасности.
    When possible, prompt users to enter security credentials at runtime. If you must store credentials in a script file, you must secure the file to prevent unauthorized access.

  3. Run the Replication Snapshot Agent from the command prompt or start the Snapshot Agent job to generate a new snapshot. For more information, see How to: Create the Initial Snapshot (Replication Transact-SQL Programming).

To modify snapshot properties of an existing merge publication

  1. At the Publisher on the publication database, execute sp_changemergepublication. Specify a value of 1 for @force_invalidate_snapshot and one of the following values for @property:

    • alt_snapshot_folder -also specify a new path to the alternate snapshot folder for @value.
    • compress_snapshot - also specify a value of either true or false for @value to indicate whether the snapshot files in the alternate snapshot folder are compressed in the CAB file format.
    • pre_snapshot_script - also for @value specify the file name and full path of a .sql file that will be executed at the Subscriber during initialization before the initial snapshot is applied.
    • post_snapshot_script - also for @value specify the file name and full path of a .sql file that will be executed at the Subscriber during initialization after the initial snapshot is applied.
    • snapshot_in_defaultfolder - also specify a value of either true or false to indicate whether the snapshot is available only in a non-default location.

  2. Run the Replication Snapshot Agent from the command prompt or start the Snapshot Agent job to generate a new snapshot. For more information, see How to: Create the Initial Snapshot (Replication Transact-SQL Programming).

Пример

This example creates a publication that uses an alternate snapshot folder and a compressed snapshot.

-- This script uses sqlcmd scripting variables. They are in the form
-- $(MyVariable). For information about how to use scripting variables  
-- on the command line and in SQL Server Management Studio, see the 
-- "Executing Replication Scripts" section in the topic
-- "Programming Replication Using System Stored Procedures".

--Declarations for adding a merge publication
DECLARE @publicationDB AS sysname;
DECLARE @publication AS sysname;
DECLARE @article AS sysname;
DECLARE @owner AS sysname;
DECLARE @snapshot_share AS sysname;
SET @publicationDB = N'AdventureWorks'; 
SET @publication = N'AdvWorksSalesOrdersMergeAltSnapshot'; 
SET @article = N'SpecialOffer';
SET @owner = N'Sales';
SET @snapshot_share = '\\' + $(InstanceName) + '\AltSnapshotFolder';

-- Enable merge replication on the publication database, using defaults.
USE master
EXEC sp_replicationdboption 
    @dbname = @publicationDB, 
    @optname=N'merge publish',
    @value = N'true';

-- Create new merge publication with an alternate snapshot location. 
USE [AdventureWorks]
EXEC sp_addmergepublication 
-- required parameters
    @publication = @publication, 
    @snapshot_in_defaultfolder = N'false',
    @alt_snapshot_folder = @snapshot_share,
    @compress_snapshot = N'true';

-- Create the snapshot job for the publication.
EXEC sp_addpublication_snapshot 
    @publication = @publication,
    @job_login = $(Login),
    @job_password = $(Password);

-- Add an article.
EXEC sp_addmergearticle 
    @publication = @publication, 
    @article = @article, 
    @source_object = @article, 
    @type = N'table', 
    @source_owner = @owner, 
    @destination_owner = @owner;

-- Start the snapshot job.
EXEC sp_startpublication_snapshot
    @publication = @publication;
GO

См. также

Основные понятия

Programming Replication Using System Stored Procedures

Другие ресурсы

Альтернативные местоположения папки моментальных снимков
Сжатые моментальные снимки
Выполнение сценариев до и после применения моментального снимка
Передача моментальных снимков по протоколу FTP
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Справка и поддержка

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