For those of you pushing your MySQL instances to higher levels, you’ll have realized at some point that all InnoDB tables share their indexing space into a single file (ibdata1, usually). This has several very bad outcomes: the ibdata1 file becomes huge after some time (we’ve seen it pass the 8GB bar) starting the MySQL […]
This article is an extension of the previous article about storing sessions in Memcached with PHP. Using Memcached for sessions storage is generally a matter of speed (storing them in memory is faster than on disk) and of scalability (using a Memcached server allows you to have several web servers serving the same PHP application […]
If you’re in a hurry/on speed, know this: this procedure is slightly more difficult (so longer) than installing the charm on Amazon you can skip directly to “Installing Juju” if you already have juju installed, you can skip to the last 2 lines of the “Installing juju” section if you already have juju-docean installed and […]
Note: this article was originally written for Chamilo 1.9 but it is also valid for all versions 1.10 and 1.11. We seldom receive a request from users of Chamilo LMS saying their sessions are cut in the middle of their activity. And sure, it might so happen that you are in the middle of the […]
Sometimes you find a perl in some code and it might take you a while to understand. In the sessions management code of Chamilo, I found this the other day, then decided to leave it for later because I was in a hurry. Then today, I found it again, and again… it took me about […]
Ever wondered where internet (and general telecommunications) cables were laid out in the ocean? This map, available on Level3 website, could help you out. This could help you out understanding, for example, how much delay you can expect between Peru and Brazil (see the missing cable, there?) :-p
In the category of little scripts that can make your life easier when managing huge Chamilo portals, this is a little one that creates one tasks-folder called “ALP” for the “Assignments” (work) tool in each active course for a portal where you have thousands of sessions, with one course per session. The script works for […]
Just as an internal note, if you get the following error trying to pull or push to a git repo: “Agent admitted failure to sign using the key” Your issue might be due to simply not having an identity defined in SSH. Simply use the “ssh-add” command to fix it.
While reading about Doctrine’s cache mechanism (which applies to other stuff than database queries, by the way), my eye was caught by a little message at the end (last section) about cache slams. I have used cache mechanisms extensively over the last few years, but (maybe luckily) never happened to witness a “cache slam”. There’s […]
Did you know…? As a “take away” information taken from this post https://gist.github.com/nikic/6699370 (by famous PHP core developer @nikita_ppv), it appears like the @ sign in PHP (used to “hide” errors, as the “error-suppression operator” it is) also disables the “compiled variables” optimization (OpCode caching).
Using a single server for multiple virtual hosts is something that comes naturally nowadays for any web server sysadmin. Using SSL certificates is also common (particularly so since the infamous Blacksheep extension for Firefox as published a few years back). However, the mixing of SSL and virtual hosts might not be as easy as you […]
Just a (great) reference: http://vimregex.com/ Read it = love it!
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