Simon's SQL

SQL,DBA,tuning,Trouble Shooting,Performance

LSN Convert

Posted by Simon Cho on 01/29/2012

http://support.microsoft.com/kb/886839

CREATE FUNCTION dbo.fn_convertnumericlsntobinary(
@numericlsn numeric(25,0)
) returns binary(10)
AS
BEGIN
-- Declare components to be one step larger than the intended type
-- to avoid sign overflow problems. For example, convert(smallint, convert(numeric(25,0),65535)) will fail but convert(binary(2),
-- convert(int,convert(numeric(25,0),65535))) will give the
-- intended result of 0xffff.
declare @high4bytelsncomponent bigint,
@mid4bytelsncomponent bigint,
@low2bytelsncomponent int
select @high4bytelsncomponent = convert(bigint, floor(@numericlsn / 1000000000000000))
select @numericlsn = @numericlsn - convert(numeric(25,0), @high4bytelsncomponent) * 1000000000000000
select @mid4bytelsncomponent = convert(bigint,floor(@numericlsn / 100000))
select @numericlsn = @numericlsn - convert(numeric(25,0), @mid4bytelsncomponent) * 100000
select @low2bytelsncomponent = convert(int, @numericlsn)
return convert(binary(4), @high4bytelsncomponent) +
convert(binary(4), @mid4bytelsncomponent) +
convert(binary(2), @low2bytelsncomponent)
END
Advertisements

3 Responses to “LSN Convert”

  1. Simon:

    Can you please let me know if using this function will help any closer to converting fn_fbLog Log to datetime.

    Thanks,

    Daniel Adeniji

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

 
%d bloggers like this: