Re: SqlServer DataBase Update Performance Problem

Hi Jamal:
I'm a little confused, as usual. There is the CommandBuilder, the DataSet with it's TableAdapters, the DataAdapter and DataReaders and Cursors all diferent methods of accessing and updating the DataBase not to mention a few diferent methods of processing Transactions. Then there is the automatic promotion of transactions to something that makes things slow and the fact that the t-sql commands are actually modified and set up for you by the MS stuff if you use almost any of the above mentioned methods. I read something about using a transaction in a certain way to improve performance, I will reread it until I get it, and will wrap the batch update in one just for kicks and post up if it does anything significant, likely tomorrow as I'm getting pretty burned out this evening, er afternoon, been up since 4:00. Perhaps I'll need to dig into some kind of Sql Performance monitor software or, better yet perhaps, switch to SqLite or the new MS Embedded DB but using SqlClint throughout all my apps makes that sound like a real headache! Oh well, it is what it is, I'm done for today, see you on the flip-side and thanks. 
Rick
Farmington Mich. USA
----- Original Message ----- From: "Jamal Mazrui" <empower@xxxxxxxxx> 
To: <programmingblind@xxxxxxxxxxxxx>
Sent: Saturday, January 05, 2008 10:44 AM
Subject: Re: SqlServer DataBase Update Performance Problem



Your approach seems right, and the execution time is puzzling indeed.
With SQLite, I know that performance is much slower if one does not
surround a set of updates with "begin transaction" and "end transaction"
constructs -- otherwise, each update is a seperate transaction.  I
wonder if a similar thing might be happening here.

Jamal
On Fri, 4 Jan 2008,
Richard Thomas wrote:


Date: Fri, 4 Jan 2008 07:14:55 -0500
From: Richard Thomas <rthomas@xxxxxxxxxxx>
Reply-To: programmingblind@xxxxxxxxxxxxx
To: programmingblind@xxxxxxxxxxxxx
Subject: SqlServer DataBase Update Performance Problem

Hi Gang:
I have a Sql Server DB. I use the DataSet approach, strongly typed, to do the following for about 5,000 rows. 
Load MyDataTable using MyTableAdapter.
Iterate the DataSet, DataTable using the
For Each MyRow in MyDataTable
update about 25 columns for each MyRow.xxx
Next MyRow
When all rows updated, do Batch Push To DB:
MyDataAdapter.Update( MyDataTable )
The above is from memory but I think the syntax is ok, anyway, it takes over 10 minuts to run the batch push for only 5,000 rows. First, that is not acceptable to me so I would like to know the fastest method of updating my DataBase. Should I use a CommandBuilder, I read some bad things about that, a DataAdapter, ditto or what? A cursor? Do you have anything on my problem as updating only a few thousand records should be almost a matter of a few seconds at most shouldn't it? 
It would be a split second for a flat or indexed file.
Rick Farmington Mich. USA

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