Choosing A Method Of Updating HA Database

Dec 16, 2007

Lets assume database A is production, B is copy. SQL Server 2005 sp2, SQL CE 3.5

Database A has a variety of transactions against it 24x7
Database B (the copy) is for reporting and as a source of merge replication for SQL CE instances
Merge replication and reporting is used 24x7 as well

I have the following requirements:
Maintain an up to date copy of the production database (need not be up to the minute, could be hourly, even daily update)
Database B is read-only. The merge replication is NOT bi-directional.

Here is the caveat (which I think prohibits using some solutions to this problem):
The production application accomplishes much of it's functionality with in-memory copies of records. I have no control over the production application. When it works against the database, it sort of does a 'withdrawal-deposit' scenario. (to the best of my knowledge it's not using SQL Server transactions) So, for every record it works with, a copy is made out of the database, changes are made in memory, a delete of the database record is done, then the record is re-inserted.

With this kind of behavior in db A, I'm not sure what it would do to log-shipping or transactional replication. I do know that I want to minimize the changes required at the SQL CE instances to keep the sync operation to a minimal cost.


Any suggestions?

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Hi all,

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Declare ValueCursor Cursor For


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for read only

Open ValueCursor
while (0 = 0)
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end

close ValueCursor
Deallocate ValueCursor

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it's been 2 hours, the job is still working.

Who has this kind of experience? How can I make updating quickly?

Thanks,

Kevin Zhang

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Apologies for the way in which I describe the tables and data, I know I'm not using a very proper way to get my point across:

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--------------------------------------------

COLUMNS:
1. JobPK (char(35))
2. LocationName (varchar(50))

DATA (csv):
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--------------------------------------------

COLUMNS:
1. JobPK (char(35))
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--------------------------------------------

COLUMNS:
LocationName
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OUTPUT (csv):
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The "most recently entered due date" is what should be reflected in my report -- just as it does above ("C")

Other Notes:

-- There are other columns of information from both tables that i would like to return, but above is the most basic form of my request. Most notably, we would need to return the JobPK in report (C).

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1) I can travel to the end of the results (from ASP),
2) read the ID of the last row
3) Create a random integer number from 1 to last ID,
4) and finaly select the appropriate random row from that integer.


Can anybody help me please?

Thanks for any help in advance!

Yours, sincerely

Efthymios Kalyviotis
ekalyviotis@comerclub.gr

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