[teiid-issues] [JBoss JIRA] (TEIID-4641) Create upsert/delete refresh support

[Steven Hawkins (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-4641?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins reassigned TEIID-4641:
-------------------------------------

    Assignee: Ramesh Reddy  (was: Steven Hawkins)


> Create upsert/delete refresh support
> ------------------------------------
>
>                 Key: TEIID-4641
>                 URL: https://issues.jboss.org/browse/TEIID-4641
>             Project: Teiid
>          Issue Type: Sub-task
>          Components: Query Engine
>            Reporter: Steven Hawkins
>            Assignee: Ramesh Reddy
>
> There must be an alternative to the implied default of the table rename strategy - which is problematic when a source is not transactional or even when it is - as a multi-part swap can leave the table non-existent for a brief window or the source may have issues with ddl under an xa transaction - TEIID-4579
> This is true for the non-transactional source incremental refresh as well, which is a delete then insert - it leaves the live table briefly in an inconsistent state.
> A upsert/delete approach addresses both of these concerns at the expense of performance - especially when the source does not directly support upsert as the engine must implement a compensating procedure.  However now that we have pushdown support for upsert, we'll continue to add source support.



--
This message was sent by Atlassian JIRA
(v7.2.3#72005)