Extending the root LVM Partition on Exadata

On an Oracle Exadata Database Machine, the ‘/’ (root) is defaulted to a size of 30Gb, which can easily fill up.  Luckily this is just a Logical Volume and there’s normally lots of space available on the Logical Volume Group which is usually untapped.

Extending ‘/’

Identify how much space is used and free on ‘/’ using df:

[root@v1ex1dbadm01 ~]# df -h /
Filesystem            Size  Used Avail Use% Mounted on
                       30G   22G   (more...)

Oracle Database Backup Service Fails with: ORA-19511: – KBHS-00715: HTTP error occurred ‘oracle-error’ – ORA-29024

I discovered an Oracle Cloud Database Backup failing with:

Starting backup at 2018/09/08 20:00:04
current log archived
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of backup plus archivelog command at 09/08/2018 20:00:07
ORA-19554: error allocating device, device type: SBT_TAPE, device name:
ORA-27023: skgfqsbi: media manager protocol error
ORA-19511: non RMAN, but media manager or vendor specific failure, error text:
   KBHS-00715: HTTP error occurred 'oracle-error'
KBHS-00712: ORA-29024  (more...)

Docker on Oracle Linux

It occurred to me that if you want to start using Docker there are plenty examples that use Ubuntu as a base platform. I read a book called Learning Docker that assumes Ubuntu for the examples. I know I am quite stubborn, a "know-it-better" person, but I want to be able to do the same on Oracle Linux.

Docker on Oracle Linux turns out not too complicated. But I ran in to a caveat that (more...)

How to Linux for the SQL DBA Articles on Simple Talk

I’ve started to write a series of articles on Simple Talk from Redgate on Linux for the SQL Server DBA.  Thanks to Kathi Kellenberger, who came to my pre-con in Indianapolis SQL Saturday and then asked if it was something that I’d be up to doing.

The biggest challenge when doing one hour sessions on Linux at SQL Saturdays is that you find out, one hour is just no where, near enough.  The (more...)

Fedora SQL*Developer

After you download SQL Developer 18 on Fedora 27, you can install it with the yum utility, like

yum install -y sqldeveloper-

The installation should generate the following log file:

Last metadata expiration check: 2:26:23 ago on Sat 25 Aug 2018 07:10:16 PM MDT.
Dependencies resolved.
 Package               Arch            Version                      Repository             Size
 sqldeveloper          noarch            @commandline          338 M

Transaction Summary
Install  1  (more...)

systemd: systemd-notify not working for non-root-users

Sometimes you have to write your own startup scripts. Recent linux distributions require systemd scripts. This is not really a problem except you have to fulfill the following requirements:
  • Run the service as a non-root-user
  • The service has a startup phase and you want to start the next startup scripts after this startup phase
So the systemd-script has to look like this:
# cat /lib/systemd/system/TEST.service

The (more...)

MySQL 5.7.* and mysqli

After installing MySQL 5.7.22 and PHP 7.1.17 on Fedora 27, you need to install the mysqli library. You need to verify if the mysqli library is installed. You can do that with the following mysqli_check.php program:

Check mysqli Install
< ?php if (!function_exists('mysqli_init') && !extension_loaded('mysqli')) { print 'mysqli not installed.'; } else { print 'mysqli installed.'; } ?>

You test preceding PHP program with the following URL in a browser:


If the mysqli program isn’t installed, you can install it as follows by opening the yum interactive (more...)

Learn Linux With Docker and Microsoft Container Image

I just finished teaching an 8 hour pre-con at SQL Saturday Indianapolis on Essential Linux for the DBA.  The focus of the class was on what the Microsoft DBA would need to know as more SQL Server environments begin to run on Linux.

The obstacles and demands of them will be a bit different than the Oracle crowd, as they may not have the Linux Admin or Unix expertise onsite for support and have (more...)

Ubuntu / Linux: WLAN connections fails with "denied authentication (status 17)"

During holidays i was not able to connect my laptop to the WLAN.
The /var/log/syslog showed the following:
Jul 15 13:45:20 pc wpa_supplicant[935]: wlp3s0: SME: Trying to authenticate with 14:9d:09:fe:a4:b3 (SSID='HUAWEI BTV' freq=2437 MHz)
Jul 15 13:45:20 pc kernel: [ 6972.826888] wlp3s0: authenticate with 14:9d:09:fe:a4:b3
Jul 15 13:45:20 pc NetworkManager[797]:   [1531655120.4746] device (wlp3s0): supplicant interface state: disconnected -> authenticating
Jul 15 13:45:20 pc kernel: [ 6972.829942] wlp3s0: send auth to 14:9d:09:fe:a4:b3 (more...)

RAC One node databases are relocated by opatchauto in 12.2 part 2

In a previous post I shared how I found out that RAC One Node databases are relocated on-line during patching and I promised a few more tests and sharing of implications. If you aren’t familiar with RAC One Node I recommend having a look at the official documentation: The Real Application Clusters Administration and Deployment Guide features it prominently in the introduction. One of the things I like to keep in mind when working with (more...)

RAC One node databases are relocated by opatchauto in 12.2 part 1

This is an interesting observation I wanted to share. I have a feeling as if there didn’t seem to be too much information out there for RAC One Node (RON) users, and I hope this helps someone thinking about patching his system.

RAC-rolling patching is well documented in patch readme files, blog posts and official white papers. Most RAC DBAs have a solid handle on the procedure. Patching RAC One Node is a different affair.


Little things worth knowing: Creating a RAC One Node database on the command line

This post is going to be super short, and mostly just a note to myself as I constantly forget how to create a RAC One database on the command line. This post is for but should be similar on 12.1 (although I didn’t test!).

Provided you are licensed appropriately, this is probably the most basic way how you create an admin-managed RAC One database on Linux for use in (more...)

Oracle Database 18c: Documentation released!

Today i surfed to docs.oracle.com and there i found the documentation for oracle database 18c:

In march 2018 i wrote about the new installation procedure of oracle database 18c via rpm, which was announced inside the "new features".

The installation guide for Linux contains now the commands for installing the database via rpm. Here a screencopy of chapter 11:
 rpm -ivh oracle-ee-db-
This command creates the (more...)

Docker on Fedora 27

This walks you through the steps to install the Community Edition of Docker on Fedora 27. If you’ve been living under a rock for a few years, Docker is an open source container virtualization software.

Docker or Docker Community Edition is a necessary step if you want to install something like Microsoft’s SQL Server on Fedora because only these are supported platforms:

  • Red Hat Enterprise Linux 7.3 or 7.4
  • SUSE Linux Enterprise Server (more...)

Ubuntu 16.04: Installation of chrome-browser fails with libnss3 (>= 2:3.22) [2]

The first solution for installing google-chrome after getting the error
dpkg: Abhängigkeitsprobleme verhindern Konfiguration von google-chrome-stable:
 google-chrome-stable hängt ab von libnss3 (>= 2:3.22); aber:
  Version von libnss3:amd64 auf dem System ist 2:3.21-1ubuntu4.

dpkg: Fehler beim Bearbeiten des Paketes google-chrome-stable (--install):
 Abhängigkeitsprobleme - verbleibt unkonfiguriert
was to install chromium (see this posting).

But now i know, what the problem was:
Inside /etc/apt/sources.list the entry:
deb http://security.ubuntu.com/ubuntu/ xenial-security restricted main (more...)

OSWatcher, Tracefile Analyzer, and Oracle RAC 12.2

When I started the series about Tracefile Analyzer (TFA) I promised three parts. One for single instance, another one for Oracle Restart and this one is going to be about Real Application Clusters. The previous two parts are published already, this is the final piece.

The environment

I am using a virtualised 2-node cluster named rac122pri with nodes rac122pri1{1,2} based on Oracle Linux 7.4. RAC is patched to I (more...)

Quick install of prometheus, node_exporter and grafana

This blogpost is a follow up of this blogpost, with the exception that the install method in this blogpost is way easier, it uses an Ansible playbook to do most of the installation.

1. Install git and ansible via EPEL:

# yum -y localinstall https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
# yum -y install ansible git

2. Clone my ‘prometheus_node_exp_grafana_install’ repository:

# git clone https://gitlab.com/FritsHoogland/prometheus_node_exp_grafana_install.git

3. Run the prometheus.yml playbook to install (more...)

Oracle database wait event ‘db file async I/O submit’ timing bug

This blogpost is a look into a bug in the wait interface that has been reported by me to Oracle a few times. I verified all versions from Oracle 11.2 version up to on Linux x86_64, in all these versions this bug is present. The bug is that the wait event ‘db file async I/O submit’ does not time anything when using ASM, only when using a filesystem, where (more...)

All about ansible vault

This blogpost is about using ansible vault. Vault is a way to encrypt sensitive information in ansible scripts by encrypting it. The motivation for this blogpost is the lack of a description that makes sense to me of what the possibilities are for using vault, and how to use the vault options in playbooks.

The basic way ansible vault works, is that when ansible-playbook reads a yaml file, it encounters $ANSIBLE_VAULT;1.1;AES256 indicating ansible vault (more...)

A re-introduction to the vagrant-builder suite for database installation

In a blogpost introducing the vagrant builder suite I explained what the suite could do, and the principal use, to automate the installation of the Oracle database software and the creation of a database on a virtual machine using vagrant together with ansible and virtual box.

This blogpost shows how to use that suite for automating the installation of the Oracle database software and the creation of a database on a linux server directly, with (more...)