openjpa-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Albert Lee (JIRA)" <j...@apache.org>
Subject [jira] [Work started] (OPENJPA-1972) DB2 V9.7 changed the default behavior concerning blocking behavior with isolation levels greater then read uncommitted
Date Tue, 05 Apr 2011 21:07:06 GMT

     [ https://issues.apache.org/jira/browse/OPENJPA-1972?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on OPENJPA-1972 started by Albert Lee.

> DB2 V9.7 changed the default behavior concerning blocking behavior with isolation levels
greater then read uncommitted
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-1972
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1972
>             Project: OpenJPA
>          Issue Type: Improvement
>          Components: sql
>    Affects Versions: 2.0.2, 2.1.0, 2.2.0
>            Reporter: Albert Lee
>            Assignee: Albert Lee
>            Priority: Minor
>             Fix For: 2.1.1, 2.2.0
>
>
> This is an intentional change in DB2 9.7.  Refer to articles:
> http://publib.boulder.ibm.com/infocenter/db2luw/v9r7/topic/com.ibm.db2.luw.wn.doc/doc/c0053503.html
> http://publib.boulder.ibm.com/infocenter/db2luw/v9r7/topic/com.ibm.db2.luw.admin.perf.doc/doc/c0053760.html
> http://publib.boulder.ibm.com/infocenter/db2luw/v9r7/topic/com.ibm.db2.luw.admin.config.doc/doc/r0053556.html
> DB2 9.7 added a cur_commit database configuration setting.  By default, for new databases,
cur_commit is "ON", which is described as follows in the 2nd article above:
> "Under the new currently committed semantics, only committed data is returned, as was
the case previously, but now readers do not wait for writers to release row locks. Instead,
readers return data that is based on the currently committed version; that is, data prior
to the start of the write operation."
> This change affected the expected outcome of a deadlock test, which need to enhance adapting
to this behavior change.

--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message