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Showing posts from October, 2014

Dinodate, PL/SQL as Scripting Language Liberator, watch the show!

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As I mentioned in a previous post, I had an awful lot of fun with Christopher Jones doing our PL/SQL: The Scripting Language Liberator talk at OOW. PL/SQL: The Scripting Language Liberator: While scripting languages go in and out of favor, Oracle Database and PL/SQL persist, managing data and implementing business logic. This session walks through a web application to show how PL/SQL can be integrated for better logic encapsulation and performance; how Oracle's supplied packages can be used to enhance application functionality and reduce application complexity; and how to efficiently use scripting language connection and statement handling features to get better performance and scalability. Techniques shown in this session are applicable to mobile, web, or midtier applications written in languages such as JavaScript, Python, PHP, Perl, or Ruby on Rails. Using the right tool for the right job can be liberating. Once word got out around Oracle that we would be unveiling DinoDate at …

Running out of PGA memory with MULTISET ops? Watch out for DISTINCT!

A PL/SQL team inside Oracle made excellent use of nested tables and MULTISET operators in SQL, blending data in tables with procedurally-generated datasets (nested tables). 

All was going well when they hit the dreaded:
ORA-04030: out of process memory when trying to allocate 2032 bytes 
They asked for my help. 

The error occurred on this SELECT:
SELECT  *
   FROM header_tab trx
   WHERE (generated_ntab1 SUBMULTISET OF trx.column_ntab)
      AND ((trx.column_ntab MULTISET
            EXCEPT DISTINCT generated_ntab2) IS EMPTY)
The problem is clearly related to the use of those nested tables. Now, there was clearly sufficient PGA for the nested tables themselves. So the problem was in executing the MULTISET-related functionality.

We talked for a bit about dropping the use of nested tables and instead doing everything in SQL, to avoid the PGA error. That would, however require lots of work, revamping algorithms, ensuring correctness, you know the score.

Then my eyes snagged on the use of DISTINCT an…

The PL/SQL Whisperer

[oreiginally published at FeuerThoughts in December 2011]

I spent two days in Berlin, training 25 developers at an event sponsored by DOAG. Then I headed over to the Netherlands to spend a couple of days with 37 developers at an AMIS-sponsored training.

But on Tuesday, after I completed the first day of training without the assistance of a microphone, my voice said "Bye, bye!" I woke up Wednesday morning to discover I had lost the ability to speak above a whisper. DOAG hustled, did what was necessary, and brought in a portable microphone/speaker system. AMIS made certain to have the same ready to go on Thursday. 

And so for three straight days, I whispered about new features of PL/SQL in 11g and much more besides. The attendees were very good natured about this less than optimal situation. One person said it made the whole class more exciting - it was as though I was giving away secrets, that no one should hear- except for the very special people in attendance.

Several students …

My Ninth OOW - and first as an Oracle employee

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Before heading out to San Fran last Thursday for meetings and the ACE Director briefing, I happened to pick up my Oracle PL/SQL Advanced Programming with Packages (my second book, published in 1996, immediately following up from the 1995 publication of my Oracle PL/SQL Programming text at IOUW in Phillie). 
Here’s what I found taped inside the cover:


That was the first Oracle Open World ever, and I was still working for SSC, the consulting firm I joined when I left Oracle in 1992. Must confess: don’t remember anything about OOW96, but I know how to count. Here’s some OOW math:
I have attended OOW96, 97, 98, 99 2000….2014: nine Oracle Open Worlds. During that time I published nine books on PL/SQL and one (with primary author Guy Harrison) on MySQL Stored Procedures; I wrote one or two automated testing frameworks for PL/SQL, and racked up 2M miles on American Airlines - ignoring my family as I traversed a sizeable chunk of human-occupied Earth presenting on PL/SQL.
OOW14 was, however,…