Tag: Linux

How to Prevent Linux 7 Housekeeping from Breaking Oracle

Linux 7 introduced multiple changes and enhancements to the kernel. Among them was automated housekeeping for temporary files. In version 6, tmpwatch is available to manage unused files in temp directories. It can be scheduled via cron to automatically keep…

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Creating a custom Oracle EBS preinstall RPM for RHEL7

Oracle, by default, ships preinstall RPMs only for Oracle Linux. Preinstall RPMs make the life of DBA very easy by taking care of installing full laundry lists of required prereq RPMs for Oracle E-Business Suite, as well as setting all required…

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Lessons learned from debugging application performance in Cloud

Lift and shift migration using tools like Cloudendure is the fastest way to migrate ‘on premises’ systems to Google Cloud. When the migration is complete, the environment can be refactored to use cloud-native capabilities. During application testing after a recent automated…

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Enable X11 forwarding after Sudo SSH session for AWS EC2 Linux instance

Working with a secure environment presents some challenges and this post will demonstrate how to overcome one of the challenges. Prerequisites: Configuration for X-Windows must have been completed. Scenario: From laptop, connect to dinh@host, then connect to ssh ec2-user, then…

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Migrating btrfs root partition to ext4 in OVM

Recently I spent some time trying to migrate root partition to another FS type in an OVM environment. The target was to migrate root partition from btrfs to ext4. Here is a short outline of how it was done. 1….

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HugePages for Oracle Database in Azure Cloud

So, what’s up? In case you don’t know, my co-worker Gleb Otochkin has written a couple of blog entries about HugePages’ support in different cloud providers here and here. Given that I am preparing a presentation about HugePages, I reached…

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Linux file system for SQL Server DBAs

With Microsoft releasing SQL Server on Linux and a lot of SQL Server DBAs coming from a predominantly Windows background, this post is going to arm the DBA with the fundamental knowledge of the Linux file system. If you come…

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Setting up Docker on Oracle Linux

Over the last couple of years, I have been hearing about Docker at different conferences. It’s a container technology that seems to have gained a lot of popularity. In recent months, I have started exploring how Docker can be used…

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BTRFS performance compared to LVM+EXT4 with regards to database workloads

Introduction In many database builds, backups pose a very large problem. Most backup systems require an exclusive table lock and don’t have any support for incremental backups; they require a full backup every time. When database sizes grow to several…

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Site reliability engineering – networking

Introduction In this blog post, I’m not going to talk about what the term SRE means or how it works. My understanding is that Google has invented the term “Site Reliability Engineer” and that this is Google’s way of doing…

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