I have a case where I need to enforce uniqueness on a combination of columns but only when a flag is set (ACTIVE_FLAG=1). The table also holds history and may have multiple inactive records mixed in but I don't want to keep those from being added to the table.
This can be done by exploiting the fact that null index expressions are not indexed. DECODE and function based index to the rescue!
Yes, I tagged it with a '1' because I already know there are more to come :)
I created a notebook on this site to collect information about PowerDesigner. My first entry deals with basic script generation options for Oracle and how to get better scripts that are more error-free when the are generated by PowerDesigner.
I am evaulating some schema migration tools for a project I am working on. I want some basic help organizing scads of changes that we will make during development. I also want the ability to produce generic SQL scripts as output to pass along for review / execution by folks that are not knee deep in our development environment.
The SQL Script output requirement cut out a lot of options. For a comprehensive list of options check out the feature matrix on the Flyway page which compares 9 popular schema migration tools.
I added a page to my SQL Developer Tips and Tricks page about integrating the Google Graph API with SQL Developer HTML reports.
I sometimes run out of steam with the built in chart and gauge capabilities of SQL Developer. With a little work you can leverage the Google Graph API to create Line, Bar, Pie Charts, Map, Scatter, Venn Diagrams, Radar Charts, QR Codes and Meters.
I have been checking out some usage patterns on a database I am migrating to Exadata. I won't go into the 'drop all of the indexes' herd mentality... but I would like to know what is really being used on this system so we can make some educated guesses about what is really needed. Luckily it is a DW / ETL type of application that has a comprehensive nightly refresh. Yes, a nice way of saying flush and fill. Well at least I know they touch _every_ important object _every_ night.