The DB server is as local as can be - ie in this case its on the same PC -
although in a VMWare workstation virtual PC.
The slowness was the main reason I wanted to check DBExpress or simpledataset
to see how fast they were.
Since then we decided to put an initial filter in the select SQL, and the time
taken to return data is definitely proportional to the number of records - 30
records takes under a second, 700 2-3 seconds. This is workable, although want
faster.
Question 1 - might the VMWare need tuning? With XP, MSSQL, D2007, and a large
dataset etc running may there some memory bottleneck issues with the VM? Has
512MB assigned for VM, looks to be sufficient..
One trick I have read is to disconnect any datasource and/or controls while
data loads - this can make a huge difference when loading a large dataset.
(This was in the help for TKBMMemtable).
Question 2 - How does ADO compare in speed to BDE/DBX etc?
John
I'd be looking to make sure that the DB Server itself isn't the bottleneck
here - quick and easy test, run the SQL select statement through Query Analyser
(yuck!) and see what sort of response time you get. Alternatively, (and
shameless plug) download a copy of DBOptimizer from our website, point it at
your server, and then get your application to hit the server and see where the
bottleneck is. DBOptimizer can also show you network issues if it's that, and
can also highlight if your client is spamming a slow down message while it
tries to digest the resultset. The trial edition will give you all the results
(it's evaluation time limited, not feature limited)
Peter Joint
Embarcadero Technologies, Inc. | www.embarcadero.com
[email protected]
Office: +61 (3) 9018-7752 | Fax: +61 (2) 8296-5831 | Mobile: +61 (404) 646
486
Linked in: http://www.linkedin.com/in/peterjoint
From: [email protected] [mailto:[email protected]] On
Behalf Of Jeremy Coulter
Sent: Tuesday, 19 January 2010 7:57 PM
To: 'NZ Borland Developers Group - Delphi List'
Subject: Re: [DUG] MSSQL with D2007
OR.....your DB server is just really slow J
We use the TADO controls, but were possible, or where I am not being lazy,
use non DB bound controls.
However I have heard the SDAC controls are meant to be pretty good as Kyley
seems to back up. Just a bit expensive from Memory.
jeremy
From: [email protected] [mailto:[email protected]] On
Behalf Of David Brennan
Sent: Tuesday, 19 January 2010 21:19
To: 'NZ Borland Developers Group - Delphi List'
Subject: Re: [DUG] MSSQL with D2007
I should say there is something wrong with your ADO setup if it is taking
that long for 7000 records, unless they are VERY big records.
7000 records of 2-4000 bytes each should be only a second or so (don't want
to be more accurate in my estimate without testing, been a while since I paid
much attention to data transfer times be honest!)
David.
From: [email protected] [mailto:[email protected]] On
Behalf Of John Bird
Sent: Tuesday, 19 January 2010 8:05 p.m.
To: NZ Borland Developers Group - Delphi List
Subject: [DUG] MSSQL with D2007
Been trying to connect to MSSQL 2005 with DB Express (TSQLConnection and
TSQLQuery), but cannot get it to work, we are getting an access violation at
address 017E0913 in DBXMSS30.DLL read of address 01820000
Using instead ADO (TADOConnection and TADOQuery) works fine, but is slow -
7000 records takes 30-40 seconds to load.
The rest of the components the same (ie TDatasetProvider, TCLientDataSet,
TDatasource) ie have been pointing the Datasetprovider at either the TADOQuery
or the TSQLQuery
Also tried the TSimpleDataSet, has the same error as the first sentence.
All the queries allow me at design time to set active to true successfully,
but still crash when the dataset is set to open....
Does anyone have any idea what could be going wrong?
And any recommendations of best combinations you prefer for MSSQL with D2007.
I am new to connecting D2007 to MSSQL so willing to do it whichever way works
best.
John
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