May 15, 2012

sp_MSgetmaxbcpgen (Transact-SQL MetaData) Definition

Please note: that the following source code is provided and copyrighted by Microsoft and is for educational purpose only.
The meta data is from an SQL 2012 Server.

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 --  this proc returns the max generation to bcp out. This essentially same  
-- as finding a possible watermark generation. The generation is the max
-- closed generation lower than the min open generation.
-- this proc is called by snapshot to determine till how much it should bcp
create procedure sys.sp_MSgetmaxbcpgen
@max_closed_gen bigint output
declare @retcode int

exec @retcode = sys.sp_MSreplcheck_publish
if @@error <> 0 or @retcode <> 0
return 1

select @max_closed_gen = max(g.generation)
from MSmerge_genhistory g,
(select isnull(gen2.generation, gen1.generation) as generation
from (select max(generation) as generation from dbo.MSmerge_genhistory where genstatus in (1,2)) as gen1,
(select min(generation) as generation from dbo.MSmerge_genhistory where genstatus in (0,4)) as gen2
) as minopengen
where g.generation <= minopengen.generation and g.genstatus in (1,2)

if @max_closed_gen is NULL
select @max_closed_gen = 0

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