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From Rick Hillegas <rick.hille...@oracle.com>
Subject Re: 10.9 release
Date Wed, 16 May 2012 17:43:33 GMT
Thanks for the heads-up, Kristian. I will hold off generating the 
release candidate until I get a green light from you that this work is done.


On 5/16/12 9:19 AM, Kristian Waagan wrote:
> On 15.05.12 20:17, Rick Hillegas wrote:
>> A little less than a week remains before we build the first 10.9 release
>> candidate. At the end of this message, I summarize the status of
>> important issues, which people had hoped we would address for 10.9.
>> At this time, I do not see any reason to push back the 10.9 schedule and
>> I plan to build a release candidate next Monday. Please let me know if
>> you disagree with this decision.
> Hi Rick,
> I'm planning to get some fixes in for update statistics functionality. 
> The current code has been posted on DERBY-5684, but it may be that I 
> break it up into a few parts. It will be a little tight, but I hope I 
> can complete this some time during Monday.
> The fixes would address the following issues:
>  o DERBY-5680: indexStat daemon processing tables over an over even 
> when there are no changes in the tables ([1])
>  o DERBY-3790: Investigate if request for update statistics can be 
> skipped for certain kind of indexes, one instance may be unique 
> indexes based on one column.
> In addition it would optimize how the statistics are generated for 
> single-column foreign keys backed by a unique index. In this case the 
> row estimate from the backing index will be used.
> To reduce the risk of something going seriously wrong in the wild, I 
> will include a debug flag that allows people to fall back to the 10.8 
> behavior ([2]). Combined with the new SYSCS_DROP_STATISTICS system 
> procedure and the knob to disable the istat daemon, that will 
> hopefully be enough to work around any issues detected after the release.
> The current code passes suites.All, and I've added an upgrade test.
> Some adjustments are required for some of our existing tests, since 
> there will be fewer statistics entries for some tables.
> Regards,

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