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https://issues.apache.org/jira/browse/DERBY-5680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13245700#comment-13245700
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Brett Bergquist commented on DERBY-5680:
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I have run a patched version of 10.8.2.2 (without the assert) overnight on a
copy of the production database where the problem was occurring. It has worked
fine, cleaned up the orphan statistics rows, and now only does the job it
should. Just some feedback from testing.
> indexStat daemon processing tables over an 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
> Reporter: Brett Bergquist
> Attachments: derby-5680-1a-drop_orphaned_stats.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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