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https://issues.apache.org/jira/browse/DERBY-4771?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lily Wei updated DERBY-4771:
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Attachment: rjone.out
With more tracking and specific tracing in the JDBC.java and
RuntimeStatisticsParser.java, I generate rjone.out for 'java
-Dderby.tests.trace=true -Dderby.language.disableIndexStatsUpdate=false -Dd
erby.language.logIndexStatsUpdate=true -Dderby.language.traceIndexStatsUpdate=bo
th junit.textui.TestRunner org.apache.derbyTesting.functionTests.tests.lang.Upda
teStatisticsTest' Form looking by the output, the unexpected result row come
from 'SELECT * FROM SYS.STATISTICS'for 'Index Scan ResultSet for T2 using index
T2I1'. And, it gets error 'A lock could not be obtained within the time
requested' was thrown while evaluating an expression.' The test did ask to
lock table t with share mode. I am not really familiar with locking for Derby.
Could we need more concurrency control for StatementNode and
RAMTransactionContext? I am including rjone.out for reference.
> Continue investigation of automatic creation/update of index statistics
> -----------------------------------------------------------------------
>
> Key: DERBY-4771
> URL: https://issues.apache.org/jira/browse/DERBY-4771
> Project: Derby
> Issue Type: Task
> Reporter: Kristian Waagan
> Assignee: Kristian Waagan
> Attachments: derby-4771-1a-prototype_code_dump.diff,
> derby-4771-1a-prototype_code_dump.stat,
> derby-4771-1b-prototype_code_dump.diff,
> derby-4771-2a-prototype_lcc_code_dump.diff, derby.log, error-stacktrace.out,
> rjall.out, rjall.out, rjall.rar, rjone.out
>
>
> Work was started to improve Derby's handling of index statistics. This issue
> tracks further discussion and work for this task.
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