[jira] [Updated] (OPENJPA-2235) "READ_UNCOMMITTED" setting for the fetch plan isolation level is ignored in DB2Dictionary

["Helen Xu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OPENJPA-2235?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Helen Xu updated OPENJPA-2235:
------------------------------

    Attachment: OPENJPA-1955.patch

Fix and unit test attached.
                
> "READ_UNCOMMITTED" setting for the fetch plan isolation level is ignored in DB2Dictionary
> -----------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-2235
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-2235
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: performance, query
>    Affects Versions: 2.1.1, 2.2.0, 2.3.0
>            Reporter: Helen Xu
>            Assignee: Helen Xu
>         Attachments: OPENJPA-1955.patch
>
>
> When user set query hint as shown below for db2, no "with UR" clause append to the query. The setting is ignored.
> query.setHint("openjpa.FetchPlan.Isolation", "READ_UNCOMMITTED");
> Uncommitted read is very risky and should be avoid if it is possible. JPA specification requires a minimum of read-committed isolation to ensure no "dirty read" and "non-repeatible read" can occur. Use of read-uncommitted isolation may cause data integrity problem.

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