[teiid-issues] [JBoss JIRA] (TEIID-4021) MSSQL Pagination

[Mark Tawk (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-4021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13285364#comment-13285364 ] 

Mark Tawk commented on TEIID-4021:
----------------------------------

I'm using teiid embedded, how can I get the source / translator configuration of the vdb?

Otherwise, i have debugged into SQLServerExecutionFactory.java; in fact, when executing the first MSSQL query it is assigning MSSQL version in initCapabilities method. And it is keeping the same value version property for the next executed mssql queries without reassigning it from the used connection.

In my case, the property "version" in  SQLServerExecutionFactory class is assigned to "11.0.2100" for mssql 2012, and when running a query on mssql 2008, "version" property is not reassigned and it keeps using the initial value "11.0.2100".

> MSSQL Pagination
> ----------------
>
>                 Key: TEIID-4021
>                 URL: https://issues.jboss.org/browse/TEIID-4021
>             Project: Teiid
>          Issue Type: Enhancement
>          Components: JDBC Connector
>            Reporter: Mark Tawk
>            Assignee: Steven Hawkins
>             Fix For: 9.1
>
>
> I'm using Teiid 8.11.3 with mssql translator.
> I have a huge table over sql server 2008 on which i'm applying pagination.
> I noticed slowliness in the query execution over this table at each time I increase the pagination.
> I monitored the JDBC queries execute by teiid and found out that it is using top n according to the limit used into the query.
> For example:
> in teiid : Select * from mytable LIMIT 90 , 10
> is translated in JDBC: select top 100 from mytable
> Since my table contains millions of records, when fetching the last page, the executed jdbc query is retrieving the whole table top n, to return in result the last 10 records. And the execution is taking too much time.



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