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
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.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
