We make a lot of posts that give IT tips and advice, as well as recommendations on how to use Monitis, so here is a summary of the posts for this week in case you missed them.

Monitoring IIS With VBScript via Monitis; It’s so Easy!

This post demonstrates how to monitor an IIS using Monitis Custom Monitors and VBscript. You can use the Monitis API to monitor your own custom metrics. This is very powerful because it lets you monitor any IIS metrics you like, set thresholds and receive notifications.

Top 4 Software Based IIS Server Performance Tips

These 4 …

I bring this up because of recent conversations I have found myself in.

Over the years I have gone back and forth between OSX & Linux laptops. Over these same years I was also monitoring several MySQL databases. I have found numerous server side solutions for you to be able to monitor your database, Nagios and of course MySQL Enterprise Monitor to list a couple. Both of these are great solutions and allow you to try and get some sleep and night.
Years ago, while using OS X, I was enlightened to learn about a free module called Geektool, it is not new, but I often find people are unaware of it.  I have had at least three conversations about it lately. While Nagios and …

Listening to the OurSQL podcast: Repli-cans and Repli-can’ts got me thinking, what are the issues with MySQL replication that Sarah and Sheeri didn’t have the time to include in their episode. Here’s my list:
Replication Capacity Index This is a concept introduced by Percona in last year’s post: Estimating Replication Capacity which I revisited briefly during my presentation at this year’s MySQL Users Conference. Why is this important? Very …

I saw that both Haidong Ji and Geert VanderKelen have proposed a Python monitor for MySQL replication, calling it the "poor man's version".
See Poor man’s MySQL replication monitoring and Geert's Refactored: Poor man’s MySQL replication monitoring.
Having Python in your server doesn't really qualify as "poor man". In many cases it's a luxury, and thus, here's my shot at the problem, using a Bash shell script.
Unlike its Python-based competition, this version also checks that the slave is replicating from the intended master, and that it is not lagging behind.

#!/bin/bash

USERNAME=msandbox
PASSWORD=msandbox
EXPECTED_MASTER_HOST=127.0.0.1
EXPECTED_MASTER_PORT=27371

SLAVE_HOST=127.0.0.1 …

In a project Severalnines is engaged in, we are developing a realtime application based on Cluster/J. To start with, I must say cluster/j is fantastic and so far I am very happy with it and beaten our expectations big time. It is quite new however and we stumbled on a couple of issues, but those were fixed very fast by the Cluster/J developers. The bugs we encountered were:

• bug 59942
• bug 59941
  

Both which were worked around, and really we never did need to have a binary or a varbinary as the PK, we used a

Performance is great - we have two data nodes (nehalem, 32GB RAM, 146GB SAS 10K disk, 2x4 core 2.4GHz (E5620) ) and two application hosts (same spec, less RAM as data …

CMON 1.1.4 - the Cluster Monitor and Manager has recently been released and here is a little how to about how to install from binary and source (at the end), deployment etc. If you use RPMs, you should follow the install guide here.


1. Download the cmon binary package to a monitoring host
Currently there are binaries available for Linux 64-bit and 32-bit (statically linked) and works for MySQL Cluster 7.0.9 and later 7.0.x versions and also 7.1.x.

In this case the monitoring host will be on 'ndb05' (IP address 10.0.1.5) - see 9. Suggested Deployment for a picture describing the setup.

The Monitoring machine should have installed:

Sometimes you know for sure. And sometimes you wonder: Is this server part of a replication system? And, most specifically, is it an active slave?
The completeness of the answer depends on how much visibility you have on the server.
If you can ask the DBA, and possibly have access to the server data directory and configuration file, you can get a satisfactory answer. But if your access is limited to SQL access, things get a bit more complicated.
If you have the SUPER or REPLICATION_CLIENT privilege, then it's easy, at least in the surface.
SHOW SLAVE STATUS will tell you if the slave is running. An empty set means that the server was not configured as a slave.
The answer is not absolute, though. You need to read the output of SHOW SLAVE STATUS to understand if replication is under way.
For example, what is the difference between these two listings?

## listing 1 …

If you're already using an SNMP monitoring tool like OpenNMS, mysql-agent is a great way to add a number of graphics using Net-SNMP. However mysql-agent has a small bug that drove me crazy. I will try to highlight the process on how I discovered it (and hence fix it) since it involved learning about SNMP, how to diagnose it and eventually, once all the pieces came together, how simple it is to write your own agents.

Although versions are not that important, just for the sake of completeness we were using CentOS 5.5, MySQL 5.5.8 Community RPMs, Net SNMP version 5.3.22 and OpenNMS Web Console 1.8.7.

The Problem
I …

CRIB is a CentRal Information Base for MySQL, a long time coming project since I worked on it on and off for a few weeks and now I decided it’s time to hand it over to the global MySQL community.

So, what is CRIB?

CRIB is a central database which collects information about all your MySQL instances which you set as clients. It is monitoring in a way, but not the typical number of connections, memory, index usage, table scans, cpu usage and such, but rather consists of a repository where, if you have tens, hundreds or even thousands of clients, you can see where a particular user was created, where a certain database name features or which tables does a database consists of. It also features a script which logs table sizes periodically (customizable) so you can graph disk usage over time and be able to forecast future disk space requirements easily.

Download the latest code with: bzr branch lp:crib

First …