Helen Xu created OPENJPA-2235:
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Summary: "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: 2.2.0, 2.1.1, 2.3.0
Reporter: Helen Xu
Assignee: Helen Xu
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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