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sys.sp_MSsetup_publisher_idrange

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Syntax
create procedure sys.sp_MSsetup_publisher_idrange
    @publication sysname,
    @source_table sysname,
    @source_owner sysname
as
    -- this proc be called in prepare merge article phase of snapshot
    -- will will setup the id range allocation for the publisher's local
    -- use of one has not already been allocated.
    -- if the publisher has a range allocated already and is using the second
    -- range we will allocate a new next range for the publisher
    declare @retcode int
    declare @range_begin numeric(38,0)
    declare @range_end numeric(38,0)
    declare @next_range_begin numeric(38,0)
    declare @next_range_end numeric(38,0)
    declare @max_used numeric(38,0)
    declare @identity_range numeric(38,0)
    declare @low_range_inclusive bit
    declare @qualified_name nvarchar(300)
    declare @pubid uniqueidentifier
    declare @artid uniqueidentifier
    declare @objid int
    declare @pubid_other uniqueidentifier
    declare @identity_support int

    select @low_range_inclusive = 0
    select @qualified_name = quotename(@source_owner) + '.' + quotename(@source_table)
    select @objid = object_id(@qualified_name)
    if @objid is NULL
    begin
        raiserror(14027, 16, 1, @qualified_name)
        return (1)
    end

    select @pubid = pubid from dbo.sysmergepublications
        where name = @publication and publisher = publishingservername() and publisher_db = db_name()
    if @pubid is NULL
    begin
        raiserror (20026, 16, -1, @publication)
        return (1)
    end

    select @artid = artid, @identity_support = identity_support, @identity_range = range from dbo.sysmergearticles where pubid=@pubid and objid = @objid
    if @artid is NULL
    begin
        RAISERROR (20027, 16, -1, @qualified_name)
        RETURN (1)
    end

    if @identity_support <> 1
        return 0

    -- check if the current db is a republisher of the given article
    if 1 = sys.fn_MSmerge_isrepublisher(@artid)
        return 0


    -- the following could be the case if the article is published in two publications and the other publication's
    -- snapshot was run first.
    if exists (select subid from dbo.MSmerge_identity_range
                where artid = @artid and subid<>@pubid and is_pub_range=0 and (sys.fn_MSmerge_islocalpubid(subid) = 1))
        return 0

    -- the following would be case if the article is in two or more publications and the other pub's snapshot has not been run
    -- yet but the subid in MSmerge_identity_range is the other publication's pubid
    select @pubid_other = subid from dbo.MSmerge_identity_range
                where artid = @artid and is_pub_range=1 and (sys.fn_MSmerge_islocalpubid(subid) = 1) and subid <> @pubid
    if @pubid_other is not NULL
        select @pubid = @pubid_other

    -- if the following is the case something is really wrong
    if not exists(select subid from dbo.MSmerge_identity_range where subid = @pubid and artid = @artid and is_pub_range = 1)
    begin
        raiserror (20663, 16, -1, @publication)
        return (1)
    end

    if exists (select 1 from dbo.MSmerge_identity_range where subid = @pubid and artid = @artid and is_pub_range = 0)
    begin
        declare @ranges_needed tinyint
        declare @refresh_constraint bit

        select @ranges_needed = 0
        if exists (select 1 from sys.identity_columns where object_id=@objid and last_value is NULL)
            set @refresh_constraint = 0
        else
            set @refresh_constraint = 1

        -- a previous snapshot has already setup the publisher range. So we will just refresh the publisher's
        -- subscriber range if needed here.
        exec @retcode = sys.sp_MScheck_publisher_range_refresh @qualified_name, @pubid, @artid, @ranges_needed output
        if @retcode<>0 or @@error<>0
        begin
            raiserror (20689, 16, -1, @qualified_name)
     return (1)
        end
        if @ranges_needed > 0
        begin
            exec sys.sp_MSrefresh_publisher_idrange @qualified_name, @pubid, @artid, @ranges_needed, @refresh_constraint
            if @@error<>0 or @retcode<>0
            begin
                raiserror(20666, 16, -1, @qualified_name)
                return 1
            end
        end
    end
    else
    begin
        -- the following statement will ensure that the ident_curr in now equal to the highest values stored in the
        -- identity column (lowest value for negative increments). This to account for incorrect reseeds
        -- IDENT_CURRENT Returns the last identity value generated for a specified table in any session and any scope.
        DBCC CHECKIDENT(@qualified_name, RESEED) with no_infomsgs

        select @max_used = max_used from dbo.MSmerge_identity_range where subid = @pubid and artid = @artid

        -- max_used below will not be null in the case of upgrade. After adding the article during the first snapshot it will be NULL
        if @max_used is NULL
        begin
            if exists (select 1 from sys.identity_columns where object_id=@objid and last_value is NULL)
            begin
                select @max_used = IDENT_SEED(@qualified_name)
                select @low_range_inclusive = 1
            end
            else
                select @max_used = IDENT_CURRENT(@qualified_name)
        end

        -- addmergearticle would have already inserted the publisher identity range in MSmerge_identity_range table
        -- what we need do here is insert the publisher's subscriber range - local allocation.
        -- now insert publisher's subscriber entry that corresponds to the range allocated to the publisher
        select @range_begin = @max_used
        select @range_end = @range_begin + @identity_range
        select @next_range_begin = @range_end
        select @next_range_end = @next_range_begin + @identity_range

        insert dbo.MSmerge_identity_range(subid, artid, range_begin, range_end, next_range_begin, next_range_end, is_pub_range, max_used)
            values(@pubid, @artid, @range_begin, @range_end,  @next_range_begin, @next_range_end, 0, NULL)
        if @@error <> 0
                goto FAILURE

        -- update the max_used for the publisher's identity range
        update dbo.MSmerge_identity_range set max_used = @next_range_end where subid=@pubid and artid=@artid and is_pub_range=1
        if @@error <> 0
            goto FAILURE

        -- call the stored procedure to reseed the table and also create the identity range check constraint
        exec @retcode = sys.sp_MSrefresh_idrange_check_constraint
                                @qualified_name,
                                @artid,
                                @range_begin,
                                @range_end,
                                @next_range_begin,
                                @next_range_end,
                                2,
                                @low_range_inclusive
        if @@ERROR<>0 or @retcode<>0
            goto FAILURE

        -- set the values about the current allocation on the distributor.
        exec @retcode = sys.sp_MSmerge_log_idrange_alloc_on_distributor
                            @pubid,
                            @artid,
                            0, -- is_pub_range publisher's local allocation is always a sub range
                            2, -- ranges_allocated we just allocated two ranges to the publisher
                            @range_begin,
                            @range_end,
                            @next_range_begin,
                            @next_range_end

    end

    return 0

FAILURE:
    raiserror(20690, 16, -1, @source_table)
    return 1

 
Last revision 2008RTM
See also

  sp_MSdrop_rladmin (Procedure)
sp_MSprepare_mergearticle (Procedure)
       



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