Apple has updated the combo updater for Mac OS X Server 10.6.3. Although Apple provided no details on what was changed, the only users who need to consider installing it are those who updated from Mac OS X Server 10.6.0 using the 1.0 version of the Mac OS X Server 10.6.3 Combo Update, build 10D573 (in other words, someone reinstalling Snow Leopard Server from scratch and then updating to 10.6.3 in one step). The combo updater is available via the Apple Support Downloads page, and will be presented by Software Update to those reinstalling Snow Leopard Server from scratch. (Free, 897.32 MB)
Syslogd Overwhelming Your Computer?
If your Leopard (Mac OS X 10.5) system is unexpectedly sluggish, logging might be the culprit. Run Activity Monitor (Applications/Utilities/ folder), and click the CPU column twice to get it to show most to least activity. If syslogd is at the top of the list, there's a fix. Syslogd tracks informational messages produced by software and writes them to the asl.db, a file in your Unix /var/log/ directory. It's a known problem that syslogd can run amok. There's a fix: deleting the asl.db file.
Launch Terminal (from the same Utilities folder), and enter these commands exactly as written, entering your administrative password when prompted:
sudo launchctl stop com.apple.syslogd
sudo rm /var/log/asl.db
sudo launchctl start com.apple.syslogd
Your system should settle down to normal. For more information, follow the link.