Question

MS SQL Query With Linked Oracle Table (Performance)

Asked by: rthomsen

Hi

I have an Access 97 Application that has several Access tables as well as several others linked to an ORACLE database.  I am trying to set the rowsource of a graph to a query that links one of the access tables with one of the linked oracle tables.  This query runs much slower than it should.  Does anyone know how I can improve the performance of these kind of queries?

The query will look something like this

SQL = "Select * from OracleTable WHERE ID IN (Select AccessID from AccessTable)"

Thanks

rthomsen

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Asked On
2004-01-19 at 15:15:59ID20855845
Tags

oracle

,

table

,

linked

,

performance

,

query

Topic

Microsoft Access Database

Participating Experts
4
Points
250
Comments
10

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Answers

 

by: heer2351Posted on 2004-01-19 at 15:18:42ID: 10150995

It is the in statement that makes it slow. You can use inner joins with linked tables, try the following query:

SQL = "Select OracleTable.* from OracleTable inner join AccessTable on OracleTable.ID = AccessTable.AccessID"

 

by: rthomsenPosted on 2004-01-19 at 15:20:38ID: 10151011

I have also tried the query with an inner join and it was still very slow.  I don't think access is taking advantage of the Oracle Indexes

 

by: PeterAlexanderPosted on 2004-01-20 at 00:20:27ID: 10153278

Combining Access and Oracle tables in Queries has also been tiresomely slow in my application. I get around this by writing more than one query. Get the data you need out of Oracle using one query. Get the data you want out of your own db using another query and then bring these together in a third query. I have often found this helps, even though there doesn't seem to be much logic as to why.

Pete

 

by: jadedataPosted on 2004-02-20 at 07:44:25ID: 10413281

No comment has been added lately, so it's time to clean up this TA.
I will leave the following recommendation for this question in the Cleanup topic area:

Split: heer2351 {http:#10150995} & PeterAlexander {http:#10153278}

Please leave any comments here within the next four days.
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

jadedata
EE Cleanup Volunteer

 

by: joekendallPosted on 2004-02-20 at 08:09:00ID: 10413564

I would create a local table from your Oracle table. Then join the local table with the other table in Access. It should run fast then.

Joe

 

by: joekendallPosted on 2004-02-25 at 15:44:44ID: 10455391

amp:

I didn't mean to cause any problems. I came across the question and was trying to help. I will keep your advice in mind and not post in a question that a cleanup volunteer is trying to close.

Joe

 

by: jadedataPosted on 2004-02-25 at 16:48:30ID: 10455805

joe:  
  Mind you I'm not disagreeing with amp,...
  but any attempt to close a question with solid solution is a good attempt in my book.  If the question would have returned this outcome could have been different.

  glad to see you're back in action anyways!

 

by: joekendallPosted on 2004-02-27 at 19:45:39ID: 10474457

Just trying to be of help. Thanks for the comments amp and jadedata.

I hope things go well with you Jack.

Joe

20120131-EE-VQP-002

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