Blog for Database and System Administrators

This blog is a collection of articles on analyzing and troubleshooting for all system and database administrators. These guides come from my experience, I hope they can help everyone.

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  • Oracle
  • MariaDB
  • Linux
  • MongoDB
  • Mysql
  • ClickHouse
  • Oracle Linux Virtualization Manager
Oracle Linux Logo

How do fsck at corrupted vm guest in Oracle OVM or Xen Server from vm images.

Hello guys! Sometimes after an incident in Oracle OVM could be that some virtual machines will go in corrupted and it will need to do an fsck about one o… Read more »

Linux, Oracle, Oracle Linux, Oracle Linux Virtualization Manager    Debian, Filesystem checks, fsck.ext3, fsck.ext4, fsck.xfs, kvm, Linux, OLVM, Oracle Linux, Oracle OLVM, Oracle OVM, Red Hat, Ubuntu, Xen Server
Oracle 19c

Oracle Dataguard queries check

We will check data guard status in SQL Plus in this article in many ways. Check 1: Check for LAG from V$DATAGUARD_STATS View. Check 2: It is also possible to… Read more »

Oracle    check, Dataguard, monitoring, Oracle 11g, oracle 12c, Oracle 18c, oracle19c, queries, query
Linux Logo

Unable to open ‘/boot/vmlinuz-*-dpkg-new’: Operation not permitted

When try to update the kernel of Ubuntu and you’ve antivirus McAfee agent installed, you can have this error : The antivirus prevents the installation of the packages as my… Read more »

Linux    Agent, Kernel, McAfee, security, Ubuntu, Updates
Oracle Linux Logo

Pre-built Oracle Database 12.2/19c (19.14) Virtualbox Image

Updated! 23-Jan-2022 SYSTEM REQUIREMENTS: This hands-on lab runs in an Oracle VM VirtualBox environment. VirtualBox 6.1 is the minimum recommended Version. In order to run the lab effectively you will… Read more »

Linux, Oracle, Oracle Linux, Oracle Linux Virtualization Manager    HammerDB, hands-on lab, Lab, Laboratory, Migration, oracle 12.2c, Oracle 19c, Oracle VM, Sql Developer, Upgrade, VirtualBox
Oracle Linux Logo

Upgrading Oracle Linux 7 to 8 using Leapp

Leapp is a Desktop DevTool that handles the management and security of your cloud credentials for you. I was wondering the other day how can I easily upgrade a OL7… Read more »

Linux, Oracle Cloud, Oracle Linux    Leapp, OCI, Oracle Linux 7, Oracle linux 8, oraclelinux, Update, Upgrade
Oracle 19c

Oracle Database tracing LDAP from CMU to AD

Oracle Database from 18c and above can authenticate and authorize Microsoft Active Directory users with the database directly without intermediate directories or Oracle Enterprise User Security (like Oracle EUS 12c)…. Read more »

Oracle    Active Directory, AD, audit, CMU, MS ACTIVE DIRECTORY INTEGRATION, Oracle 18c, Oracle 19c, Oracle 21c, security
Exadata

How to find Exadata database machine version

Find Your Exadata Machine Version Are you really curious to see which version of Exadata you are using. Just follow the step and you are ready with the information$cat /opt/oracle.SupportTools/onecommand/databasemachine.xml… Read more »

Engineered System, Exadata, Oracle    exadata, Exadata Machine Version, Oracle Exadata
OpenWRT

How to upgrade all of the installed packages in OpenWRT

OpenWRT (from open wireless router) is an open-source project for embedded operating systems based on Linux, primarily used on embedded devices to route network traffic. The main components are Linux,… Read more »

OpenWRT    Openwrt, Openwrt 19.07, Openwrt 21.02, Packages, script, Updates
Linux Logo

Nextcloud 21 stop working after upgrade mariadb 10.6.X

If you have upgraded MariaDB 10.5 to 10.6, you will see that Nextcloud 21 will stop working and you’ll see this message : In the log, if enabled, you can… Read more »

Linux, MariaDB    innodb_read_only_compressed, KEY_BLOCK_SIZE, MariaDB, MariaDB 10.5, Mariadb 10.6, Nextcloud 21, Nextcloud upgrade, ROW_FORMAT
Linux Logo

Comparison Between Btrfs and XFS Filesystems

There are many filesystems available for use with Linux. The most common Linux filesystems include Ext4, Btrfs, XFS, and ZFS. Every filesystem has its unique use cases, pros, and cons…. Read more »

Linux    btrfs, ext4, Tuning, xfs

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Recent Posts

  • How do fsck at corrupted vm guest in Oracle OVM or Xen Server from vm images. May 2, 2022
  • Oracle Dataguard queries check April 12, 2022
  • Unable to open ‘/boot/vmlinuz-*-dpkg-new’: Operation not permitted March 10, 2022
  • Pre-built Oracle Database 12.2/19c (19.14) Virtualbox Image January 23, 2022
  • Upgrading Oracle Linux 7 to 8 using Leapp January 21, 2022
  • Oracle Database tracing LDAP from CMU to AD November 15, 2021
  • How to find Exadata database machine version September 14, 2021
  • How to upgrade all of the installed packages in OpenWRT August 12, 2021
  • Nextcloud 21 stop working after upgrade mariadb 10.6.X August 2, 2021
  • Comparison Between Btrfs and XFS Filesystems April 9, 2021
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