Author Archives: admin
„The host name ‚myHost‘ is invalid. Ensure the host name resolves to a valid ip address. Specify a valid host name and rerun the command.“ = loopback is not associated with hostname. Solution =
echo "127.0.0.1 $HOSTNAME" >>/etc/hosts
As R language is taken as one of the best analytics languages/tools in general, databases can‘ t be overlooked. Article is focused on very simple connection example for connecting R with Oracle database.
Know that kind of concerns? You bought really expensive license for great software…. changed operating system… and just rely that if it is written in Java, it can’t be problem to use it. Agreed.
Know that feeling that something is just different while using new operating system? Ok, fan is running and – indeed – it is caused by power (non-)saving features in default setting (at least in my case). How to solve it … Continue reading
Getting rid of kernel fixing (dividing by zero), kernel versions, unbelievable bugs on every step, poor disk setting (file system), poor security (shell shock, remember?)? Ok, I tell you something. I switched from linux(thx for 15 great years anyway!) to … Continue reading
Sometimes it’s very useful to skip well-known master-slave replication scenario and focus on master-master possibility 🙂
As you probably know, Oracle denied to distribute jre/jdk of Oracle Java directly in linux distributions. Exchange with OpenJDK packages was cruel, anyway there are few ways how to install original Java environment again.
Default DB2 DB and DBM variables are set pretty well and logical. The only manual adjusting can occur when you’re trying to overload transactions a bit. For example by copying tables.
Maybe you know it – virtual linux machine is used for anything (installing Oracle for example) – and its size says something about 12GB /df -h/ – what a surprise that your host OS is allocating around 25GB and still … Continue reading
There are installing processes that I really do love (DB2) and on the other side there are install processes which I really hate (Oracle Database). Bright and dark side of database software in linux world. Let´s uncover one of the … Continue reading
As you know, Openjdk is spammed through all main linux distributions. If you like Oracle (eh) or just want to have good old Sun java, not slow Openjdk…. and you are really lazy, check this out 🙂
If you think that simple „dd bs=1M count=512 if=/dev/zero of=test conv=fdatasync“ disk benchmarking is not enough – you’re completely right. There are not so many tools benchmarking your disk, one of the most used is Bonnie++.
One of most valuable thing is good documentation – for common database actions. I didn´t find any well documented step-by-step guide to change data directory in MariaDB, Debian environment. Please be aware that this one guide is not perfect and … Continue reading
As Debian is still using MySQL in default, there are very few steps to install MariaDB 10.x…
Useful and common task, should be well documented. Let´s try it! Debian 7.4 x64, PostgreSQL 9.3.2