Articles

How to restart a database after failed parameter change

I thought I would publish a simple set of steps that can be followed to restart an Oracle Database after a parameter change causes the database not to open. Here is an example (on Windows). Let’s assume my database (gisdb) currenly has its compatible parameter set to 10.2.0.4. Because I want to test performance atRead More

Boarder and District Spatial Information Group Presentation on Spatial Datbases

On Tuesday November 11th 2008 I gave a 1 hour presentation on spatial databases entitled An Introduction to Spatial Databases to the Boader and District Spatial Information Group (BADSIG) at Albury NSW. The presentation was rather long as, generally, GIS practitioners are usually unfamiliar with database technology (no fault of their own) and so IRead More

generate_series: an Oracle implementation in light of SQL Design Patterns

There is a very useful function in PostgreSQL called generate_series that can be used to generate a series of integer numbers from some start value to an end value with an optional step value. Here is the function and its description from the PostgreSQL help. Function Argument Type Return Type Description generate_series(start, stop) int orRead More

Simplification and Gridding

Simplifier is a Manifold Map script that implements a set of different methods for topological simplification of a planar-enforced polygon drawing. The code (map file) can be downloaded here To understand what it does see the presentation on Gridding and Simplification (Presentation on techniques for modifing/splitting of large polygons that demonstrate slow performance when beingRead More

On the use of ROLLUP in Oracle SELECT statements

This article is not about Oracle Locator/Spatial but simply about the use of some of Oracle’s Relational On-Line Analytical Processing (ROLAP) functionality in building reports for publication with a range of software from Apex to Crystal Reports. The context for this is that I regularly am hirecd to write ordinary financial reports for the DepartmentRead More

Presentations given by myself at the Australian Oracle Spatial Forum, Sydney, Thursday 28th August 2008

I gave two presentations at the Australian Oracle Spatial Forum held at the Novotel Hotel, Sydney Olympic Park on Thursday 28th August 2008. My two papers were: Automated Layer Management – Experiences At Mid Coast Water Gridding vs Simplification in Extracting Performance from High Density Data The first was co-authored with Mr Brendan Soustal thoughRead More