Stephan van Loendersloot created DERBY-6794:
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Summary: SYSCS_UTIL.SYSCS_SET_RUNTIMESTATISTICS(1) returns a long
varchar (32,700)
Key: DERBY-6794
URL: https://issues.apache.org/jira/browse/DERBY-6794
Project: Derby
Issue Type: Improvement
Components: SQL
Reporter: Stephan van Loendersloot
Priority: Minor
The internal function SYSCS_UTIL.SYSCS_SET_RUNTIMESTATISTICS(1) returns a
VARCHAR(32,700), also known as a LONG VARCHAR in Derby.
In a lot of cases, this is not enough.
A couple of years ago at our company, we tried to mimic EXPLAIN functionality
as sent by MySQL, however, because MySQL didn't satisfy our needs, we needed a
change, and needed somethings similar, as reflected here
http://mail-archives.apache.org/mod_mbox/db-derby-user/200810.mbox/%[email protected]%3E.
Now, we're building something like http://explain.depesz.com.
As an example, which consists of some ridiculously simple JSP; Not by any means
complete, but working processing engine for the explain plan, we created this:
http://www.republika.nl/upload/explain_test.jpg
Soon, we'll provide a link to use this for all of you, like depesz.com does.
We'll enter some other JIRA issues to be sure about what we're doing, but
basically it means you can simply copy & paste your explain plans.
We do intend to give it back to the community, by releasing it via the Apache
License v2.0, but only when we're sure that every assumption we made is
correct. In the meantime we'll provide a URL where you can copy and paste
explained plans, just like depesz.com does.
However, we've got some complicated queries, for which the runtime statistics
retrieved by the built-in function are bigger than a LONG VARCHAR...
Is there something we can do about that?
I've thought about changing code and making it a CLOB, but that would break
backwards compatibility.
I'll give a full URL within 2 weeks, so you can try and test if you like what
you see.
In the meantime... the issue is that we don't always get the full result plan,
because of character limitations...
Thanks for your attention.
-- Stephan van Loendersloot.
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