RE: Understanding Terracotta caching

  • From: "Goulet, Richard" <Richard.Goulet@xxxxxxxxxxx>
  • To: <sbecker6925@xxxxxxxxx>, "oracle-l" <oracle-l@xxxxxxxxxxxxx>
  • Date: Fri, 22 Jan 2010 12:29:47 -0500

    I wholeheartedly agree with you, attend the training.  Nothing bad
has ever come out of sitting in a training class.  I'd also ask tons of
general, but specific question about the product since your more than
likely to get the truth out of an instructor vs. a sales droid.  After
that apply your training on a test/dev environment by installing the
product and then beating it up real good. It appears like you already
have a number of test cases in mind.

Dick Goulet 
Senior Oracle DBA/NA Team Lead 
PAREXEL International 



From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Sandra Becker
Sent: Friday, January 22, 2010 11:21 AM
To: oracle-l
Subject: Re: Understanding Terracotta caching

Fallback plan?  What's that?  I swear some of these people don't have a
clue when it comes to effectively coding for / managing a production
application.  I have been requesting fallback plans for every code
promotion or system change for the past 3 1/2 years.  No one seemed to
think it was necessary until we broke the application in our last code
promotion and they didn't have a backout plan in place.  Took 6 hours to
get a plan together and back out the bad code.  Fortunately, we didn't
have to pay any penalties to customers.
Back to caching -- I did make a little headway with the data architect.
Following the suggestion to get cache hit ratios on the tables, I have
convinced the DA to take another look at the tables he wants to cache.
He still wants to cache the m table but I'm not sure it's really a good
idea.  For every logical read, there are 226 writes.  That may or may
not be a bad thing.  He did mention that most of the tables he wants to
cache would probably be refreshed once every 24 hours.  I'm not certain
that's soon enough for some of the tables he has in mind given the
number of writes in a 24 hour period.  I need to know more about how
this is going to work.  I also mentioned to him that I'd been reading up
on Terracotta on their website to determine the best objects for
caching.  He invited me to attend the Terracotta training next week.  I
figure the more I learn the better prepared I'll be so I accepted.

Transzap, Inc.

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