Mark A Matte
markamatte at hotmail.com
Thu Jan 27 13:55:52 CST 2005
Tom, ">Mark - instead of using APPEND queries, would it not be any faster to pull >the data from Informix in an ADO recordset - I'm doing this via ODBC as >this >is how our Terminal Servers are set up >:¬( - then open a DAO recordset on >your Access table, and loop round in a do...while copying the records from >one to the other" I've never used ADO...can you send a sample of code? Thanks, Mark >From: Tom Bolton <tom.bolton at donnslaw.co.uk> >Reply-To: Access Developers discussion and problem >solving<accessd at databaseadvisors.com> >To: "'Access Developers discussion and problem >solving'"<accessd at databaseadvisors.com> >Subject: RE: [AccessD] Data from Informix to Access - dirty reads? >Date: Thu, 27 Jan 2005 10:57:05 -0000 > >Mark (and Jim) > >Sorry for the delay, had a bit on yesterday. There are indeed ADO/OLEDB >drivers for Informix, a colleague has installed one but is having a little >difficulty with the connection string. Try >http://www.connectionstrings.com > > >Mark - instead of using APPEND queries, would it not be any faster to pull >the data from Informix in an ADO recordset - I'm doing this via ODBC as >this >is how our Terminal Servers are set up >:¬( - then open a DAO recordset on >your Access table, and loop round in a do...while copying the records from >one to the other? Jim has an excellent link explicitly explaining how to >do >just this. However, I've a sneaking suspicion that he's right, and ODBC is >at the bottom of your woes - definitely worth exploring OLEDB, as methinks >ODBC is a little old-hat these days. > >It might just be me (ASP/Oracle/SQL Server background) but I like to try >and >avoid letting Jet anywhere near anything that's not solely concerned with >Access FE tables (for which, of course, it's excellent). > >Cheers >Tom > > >-----Original Message----- >From: Jim Lawrence [mailto:accessd at shaw.ca] >Sent: 27 January 2005 04:48 >To: 'Access Developers discussion and problem solving' >Subject: RE: [AccessD] Data from Informix to Access - dirty reads? > >Hi Mark: > >Your bottle-neck is ODBC. The only way around that is if there is a direct >ADO-OLE equivalent. I am sure there are ADO drivers for every version of >Informix...check these out: > >http://www.gold-software.com/LuxenadbExpressdriverforInformixPro-review9342. >htm (ADO type driver... shareware. > >You can download the driver from IBM at: >http://www.ibm.com/products/finder/us/en/finders?pg=ddfinder > >To then use it the code is something like this: > >Dim objConn As ADODB.Connection >Dim gsConnectionString as String > >gsConnectionString = "Provider=Ifxoledbc;Password=pass; Persist Security >Info=True;User ID=user;Data Source=market_report;" > >objConn.connectionstring = gsConnectionString >objConn.Open > >HTH >Jim > > >-----Original Message----- >From: accessd-bounces at databaseadvisors.com >[mailto:accessd-bounces at databaseadvisors.com] On Behalf Of Mark A Matte >Sent: Tuesday, January 25, 2005 6:49 AM >To: accessd at databaseadvisors.com >Subject: RE: [AccessD] Data from Informix to Access - dirty reads? > >Hello All, > >Every week I do pulls from Informix to A97 using ODBC. 1 of my pulls now >is > >around 1 million records. I use temp tables and append queries. This can >take a few hours. Some of the replies in this thread imply there is a much >'better/faster' way. Without changing versions of Access...is there a way >to 'tweak'/'speed up' this data pull? > >Thanks, > >Mark > > >From: Roz Clarke <roz.clarke at donnslaw.co.uk> > >Reply-To: Access Developers discussion and problem > >solving<accessd at databaseadvisors.com> > >To: "'Access Developers discussion and problem > >solving'"<accessd at databaseadvisors.com> > >Subject: RE: [AccessD] Data from Informix to Access - dirty reads? > >Date: Tue, 25 Jan 2005 09:52:19 -0000 > > > >Informix doesn't support XML afaik >< > > > >We did think about this as a way around connection issues for SQL Server > >when we thought that we would have our main db replicating to SQL Server > >rather than Informix - our recordsets are going to be up to about 50k >rows > >I > >think. I don't know how XML would perform with that volume of data but >it's > >academic for now. > > > >Roz > > > >-----Original Message----- > >From: John W. Colby [mailto:jwcolby at colbyconsulting.com] > >Sent: 24 January 2005 20:58 > >To: 'Access Developers discussion and problem solving' > >Subject: RE: [AccessD] Data from Informix to Access - dirty reads? > > > > > >How much data? Can it export it to an XML file in a location where your >fe > >can use it? XML has a high overhead but can be useful in cases like >this. > > > >John W. Colby > >www.ColbyConsulting.com > > > >Contribute your unused CPU cycles to a good cause: > >http://folding.stanford.edu/ > > > >-----Original Message----- > >From: accessd-bounces at databaseadvisors.com > >[mailto:accessd-bounces at databaseadvisors.com] On Behalf Of Roz Clarke > >Sent: Monday, January 24, 2005 10:23 AM > >To: 'Access Developers discussion and problem solving' > >Subject: [AccessD] Data from Informix to Access - dirty reads? > > > > > >Hi all > > > > > >We have a bit of a problem with getting data out of our Informix server > >since we recently turned on transaction logging for replication. When > >extracting data with an Access XP MDE using pass-through queries, Access > >locks entire tables in the Informix database, which causes transaction > >errors and makes the Informix database scarily unstable. > > > >Our Informix suppliers told us that the way to avoid these locking issues > >was to set the connection to 'dirty read' before running the SQL. >However, > >Access cannot execute 2 statements in a pass-through query and it does >not > >hold the connection open between the execution of 1 statement and the >next. > >Thus when the query is processed the 'dirty read' setting is no longer in > >effect. > > > >We have been racking our brains trying to come up with a workaround. Some > >further options that we have considered are: > > > >* Stick the data in a temp table in Informix. This is no good because > >the temp table is destroyed automatically when the connection is closed >and > >there's no way to make it persist long enough to bind it to a report. > >* Use a view in Informix. This is no good because views in Informix > >cannot be set read-only. > >* Create a permanent table in Informix and destroy it when finished > >with it. This is far from ideal because Informix does not support SELECT > >INTO and therefore a table would have to be explicitly constructed with > >names columns etc. We really need the system to be flexible so that the > >queries can be easily changed. > >* Use an ADO recordset. This is a PITA because you cannot bind a > >report to a recordset in an MDE and we cannot build the report on the fly >- > >we are a Terminal Services site so we will have up to 20 users in one FE. > >* Create a table in Access and destroy it when finished with it. Can't > >think of a better way to induce bloating... > > > >Has anyone faced this kind of problem before? Any bright ideas? Our > >foreheads are starting to bleed... > > > >TIA > > > >Roz (and Tom) > > > > > >-- > >AccessD mailing list > >AccessD at databaseadvisors.com > >http://databaseadvisors.com/mailman/listinfo/accessd > >Website: http://www.databaseadvisors.com > > > >The contents of this message and any attachments are the property of >Donns > >Solicitors > >and are intended for the confidential use of the named recipient only. > >They may be legally > > privileged and should not be communicated to, or relied upon, by any > >other party without > >our written consent. If you are not the addressee, please notify us > >immediately so that we > >can make arrangements for its return. You should not show this e-mail to > >any person or > > take copies as you may be committing a criminal or civil offence for > >which you may be > > liable. 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