It annoyed me slightly that when I googled modify_snapshot_settings just now and all of the examples used huge numbers for the retention with (at best) a brief comment saying what the number meant. Here is a better example with slightly more readable code. Hope a few people down the road (more...)
Yesterday I attended John King (@royaltwit) session on Oracle 12c for developers. He gave an overview of all the goodies that are available to us as developers. The whole plugging and unplugging of database, though very cool and exiting, is most likely not very relevant to most developers.
When he (more...)
Representing hierarchical data in an APEX Tree is fairly straight forward, the wizard to create a tree region assists you with that. But when you need to show data from multiple tables, you will need to provide your own query. In a previous blogpost I have written how to achieve (more...)
Here are two interesting enhancements in Oracle database 12c PL/SQL. PL/SQL subprogram defined using WITH clause of a subquery – Oracle database 12c allows PL/SQL declaration section in the WITH clause. One can define PL/SQL function or procedure into a WITH clause. Functions declared in the PL/SQL declaration section can (more...)
Thank you all who attended my sessions at NYOUG Fall Conference this morning. I appreciate spending you most precious commodity - your time
- with me. I sincerely hope you found both the presentations enlightening as well as entertaining.
Please see the details of the sessions below along with the (more...)
Working on the chapter that covers best ways of manipulating with object collection. Of course, if you talk about pagination of the rowset, it is very tempting to test Oracle 12c new feature - OFFSET…FETCH.
Unfortunately, immediately got an issue. It seems to me that passing a variable to FETCH (more...)
I was looking at the Apex 4.2.2 installation script (coreins.sql), and noticed the mention of a new package, wwv_flow_json, which is apparently being worked on but was removed at the last minute "as no longer required for 4.2.2".
Even though the package is not installed (more...)
Over the weekend one of my friends asked me for a clarification on RESULT_CACHE
- a really interesting functionality that allows Oracle to cache in SGA results of PL/SQL function calls.
The point of confusion was the fact that between 11gR1 and 11gR2 Oracle development team significantly re-thought this feature (more...)
Yet another performance tuning story
, similar to one that happened about a month ago
. Just to keep it short:
- once upon a time there was a very time-consuming module.
- eventually we were forced to take much closer look - WHY is it so time-consuming
- we found in our own (more...)
After a couple of requests at IOUG Collab'13 I decided to resurrect a pretty old topic that I've participated in 2008 (since in 5 years there was no changes on that front :-) ).
As we all know, starting version 11g Oracle tracks PL/SQL dependencies in much more granular way (more...)
I was looking for PL/SQL examples to use metadata and data filtering in datapump API, but I didn't find any. So here is one example. It uses table reload_dev_tables to specify what schemas/tables should be exported using data pump and what where clause should be set.
Structure for reload_dev_tables:
For the Friday evening I decided to dig out my example from the most recent of my published books (Expert PL/SQL Practices, APress, 2011
) - it was a very fun project to work with: first, to come with with the idea of such multi-author book, second, to write (more...)
This post is a continuation of a topic, I've raised previously - dynamic implementation of generic searches
. As I mentioned in that post, there are circumstances, when it is much more convenient to return a pointer to a row-set instead of that row-set. Or in terms of Oracle - REF CURSOR (more...)
It is a very common problem - how do you implement generic search over the table? By generic search I mean that users are provided with tons of different options that could be used in all possible permutations.
It leads to a standard problem - how do you make sure (more...)
I'm busy deriving file layouts from PL/SQL. Probably close to 100 file definitions...each of them slightly different, each of them defined in the code. Fun!
There are a mixture of types too, fixed width, csv, etc. Thankfully, I've read enough of the code now that it's relatively easy to (more...)
I've been scratching my eyes out lately trying to reverse engineer
lots of PL/SQL.
One thing I've seen a lot of is calls to dbms_output.put_line
. Fortunately, I've seen some dbms_application_info.set_module
and other system calls too. But back to that first one.
1. When I used dbms_output
In this post I’ll finish up the CRUD implementation using records, procedures and views. This series of blog posts started with this post which was followed by this.
At this point we have a working report that links to a form. The report is based on a view and the form is based on a procedure. At this point the form is only loading the record in using a procedure that uses a record in its signature. In this post we’ll complete the functionality by using the same form for insert, update, and delete functionality.
Let’s start with adding a (more...)
Like a middle aged man visiting the gym for the first time in 10 years, I am merely going to flex my blogging muscles here…
One of the recurring issues that annoys me on the OTN SQL & PL/SQL forum, and also the APEX forum is the misunderstanding of what (more...)
The latest version of Alexandria, the utility library for PL/SQL
, is now available for download
. The previous version has been downloaded more than 2,000 times in the last 8 months.
file contains a fairly detailed list of additions, enhancements and bug fixes. Below are some of the more noteworthy changes:
Improved installation script
You can now choose between installing the full library (close to 50 packages as of this version), by running the main /setup/install.sql
script, or you can install just the core set of packages via setup/install_core.sql
and then choose additional sets of (more...)
In every other profession having a 20 year experience is a good thing, in ours you are treated as a has-been who is kept around only to maintain the legacy system. This is insane.