How to

One of the databases that support our application has some tables where data is updated very frequently. In PostgreSQL world, this means the table must be vacuumed very frequently to remove the old versions of the updated rows, clearing up space for new rows or new versions of existing rows. On very frequently updated tables, […]

I was expecting that. Fortunately, I was ready for it. So, I’ll describe some details of upgrading Leopard Server from 10.5.2 to 10.5.4 to avoid you the same trouble. If you read my previous article about Leopard Server, you know that I had to recompile MySQL, PHP and Apache to PowerPC 32 bits, because I

WARNING: the solution presented in this article is wrong. It’s a partial solution only, it won’t always work, and you may screw up your data. To see why, check my second article on this issue. There are many situations, in simple web applications, where you don’t really have to deal with concurrent data update. Imagine

When developing a Web Application, many times you need to test how will it react then operating over a slow internet connection, like 56k modem, GPRS or any other situation where the bandwidth is tight. This is important not only to test how long will those funky pictures take to load, but as AJAX gets

In my previous article, I presented Amanda, its basic concepts, and how does it compare to Time Machine. Now, I’ll give you an example of how to install and configure a Mac OS X machine to be an Amanda client. The next post will explain how to properly recover after a catastrophic failure. As with

More than Lion, iLife or the new awesome MacBook Air, the one thing I liked best about today’s Apple event was that sentence, pronounced by Steve Jobs during the iLife presentation: “That’s why we do what we do”. Why? Today I left a meeting a few minutes after the beginning of the Back to my

Recently I had to profile a WO application for memory leaks (more exactly, unintentional retention of objects that prevented them from being garbage-collected). Some quick notes: Eclipse TPTP will not work on Mac OS X. Period. Although Eclipse allows you to install it without complaining, it does not work at all. I found this nice article about profiling

A not very fast but handy way to downscale images in a WebObjects application is using Java 2D APIs, with code like this: BufferedImage reducedImage = new BufferedImage(newX, newY, BufferedImage.TYPE_INT_RGB); Graphics2D g = reducedImage.createGraphics(); g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC); g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_SPEED); g.drawImage(originalImage, 0, 0, newX, newY, 0, 0, originalImage.getWidth(), originalImage.getHeight(), null); g.dispose(); Although not blazing fast,