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https://issues.apache.org/jira/browse/DERBY-5680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13692125#comment-13692125
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Mike Matrigali commented on DERBY-5680:
---------------------------------------
Is this fix ok to backport to 10.8? I think DERBY-3790 should not be
backported as it is a feature, so most of need for this issue is not in 10.8.
But
I think there are some cases in 10.8 that are fixed by this, correct?
> indexStat daemon processing tables over and over even when there are no
> changes in the tables
> ---------------------------------------------------------------------------------------------
>
> Key: DERBY-5680
> URL: https://issues.apache.org/jira/browse/DERBY-5680
> Project: Derby
> Issue Type: Bug
> Components: Store
> Affects Versions: 10.8.2.2, 10.9.1.0
> Reporter: Brett Bergquist
> Assignee: Kristian Waagan
> Fix For: 10.9.1.0
>
> Attachments: derby-5680-1a-drop_orphaned_stats.diff,
> derby-5680-1b-remove_disposable_stats.diff,
> derby-5680-2a-remove_redundant_check.diff,
> derby-5680-3a-rename_debug_property.diff
>
>
> I think there is something wrong with the indexStats.
> The problem happens on many tables in the database.
> None of these tables are changing however, no inserts or deletes or updates.
> They are being queried, however.
> Here is one such table.
> Here is the statistics for this table:
> Table (Index) 2 3
> ACCOUNTTABLE_CONFIG_BUNDLE (SQL081029110443810) numunique= 38390
> numrows= 38390 2012-03-30 13:00:26.84
> ACCOUNTTABLE_CONFIG_BUNDLE (SQL100922215819290) numunique= 38390
> numrows= 38390 2012-03-30 13:00:26.917
> There are in fact 38390 rows in the table.
> Here is some of the indexStat trace:
> Fri Mar 30 12:47:12 EDT 2012 Thread[DRDAConnThread_43,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": update scheduled,
> reason=[t-est=38390, i-est=2355 => cmp=2.7912562815443245] (queueSize=12)
> Fri Mar 30 12:47:48 EDT 2012 Thread[index-stat-thread,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": wrote stats for index
> SQL081029110443810 (fc33890d-011d-491f-3d8c-0000376d74d3): rows=38390,
> card=[38390]
> Fri Mar 30 12:47:48 EDT 2012 Thread[index-stat-thread,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": wrote stats for index
> SQL100922215819290 (75608675-012b-3c38-b55c-000043ea6398): rows=38390,
> card=[38390]
> Fri Mar 30 12:47:48 EDT 2012 Thread[index-stat-thread,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": scan durations
> (c30625=91ms,c30625=98ms)
> Fri Mar 30 12:47:48 EDT 2012 Thread[index-stat-thread,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": generation complete (210 ms)
> Fri Mar 30 12:47:49 EDT 2012 Thread[DRDAConnThread_44,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": update scheduled,
> reason=[t-est=38390, i-est=2355 => cmp=2.7912562815443245] (queueSize=19)
> Fri Mar 30 12:48:25 EDT 2012 Thread[index-stat-thread,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": wrote stats for index
> SQL081029110443810 (fc33890d-011d-491f-3d8c-0000376d74d3): rows=38390,
> card=[38390]
> Fri Mar 30 12:48:25 EDT 2012 Thread[index-stat-thread,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": wrote stats for index
> SQL100922215819290 (75608675-012b-3c38-b55c-000043ea6398): rows=38390,
> card=[38390]
> Fri Mar 30 12:48:25 EDT 2012 Thread[index-stat-thread,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": scan durations
> (c30625=93ms,c30625=95ms)
> Fri Mar 30 12:48:25 EDT 2012 Thread[index-stat-thread,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": generation complete (211 ms)
> Fri Mar 30 12:48:25 EDT 2012 Thread[DRDAConnThread_50,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": update scheduled,
> reason=[t-est=38390, i-est=2355 => cmp=2.7912562815443245] (queueSize=18)
> Fri Mar 30 12:48:57 EDT 2012 Thread[index-stat-thread,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": wrote stats for index
> SQL081029110443810 (fc33890d-011d-491f-3d8c-0000376d74d3): rows=38390,
> card=[38390]
> Fri Mar 30 12:48:57 EDT 2012 Thread[index-stat-thread,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": wrote stats for index
> SQL100922215819290 (75608675-012b-3c38-b55c-000043ea6398): rows=38390,
> card=[38390]
> Fri Mar 30 12:48:57 EDT 2012 Thread[index-stat-thread,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": generation complete (243 ms)
> Fri Mar 30 12:49:27 EDT 2012 Thread[DRDAConnThread_56,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": update scheduled,
> reason=[t-est=38390, i-est=2355 => cmp=2.7912562815443245] (queueSize=20)
> Fri Mar 30 12:49:36 EDT 2012 Thread[index-stat-thread,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": wrote stats for index
> SQL081029110443810 (fc33890d-011d-491f-3d8c-0000376d74d3): rows=38390,
> card=[38390]
> Fri Mar 30 12:49:37 EDT 2012 Thread[index-stat-thread,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": wrote stats for index
> SQL100922215819290 (75608675-012b-3c38-b55c-000043ea6398): rows=38390,
> card=[38390]
> Fri Mar 30 12:49:37 EDT 2012 Thread[index-stat-thread,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": scan durations
> (c30625=111ms,c30625=108ms)
> Fri Mar 30 12:49:37 EDT 2012 Thread[index-stat-thread,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": generation complete (238 ms)
> Fri Mar 30 12:49:37 EDT 2012 Thread[DRDAConnThread_49,5,main] {istat}
> "PKG_9145E_V1"."ACCOUNTTABLE_CONFIG_BUNDLE": update scheduled,
> reason=[t-est=38390, i-est=2355 => cmp=2.7912562815443245] (queueSize=18)
> As can be seen, the "i-est" appears to be wrong and is used over and over
> even though the statistics for the indexes have been updated.
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