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Daniel Westermann

Getting started with Exasol – A multi node cluster in AWS

By | AWS, Database Administration & Monitoring | No Comments

As of now, all the previous posts worked with the Community Edition of Exasol. While that is great for getting started quickly (the Community Edition comes with all the features, except multi node support and a limit of 200GB of data) there are some limitations: Can you not really test how data is distributed across cluster nodes because there is only one. You do not have a real access to the operating system as the…

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Franck Pachot

Amazon Aurora Serverless (PostgreSQL compatibility)

By | AWS, Cloud | No Comments

By Franck Pachot . I’ve written a blog post about serverless databases and here is an example of Amazon RDS Aurora PostgreSQL in serverless mode: When I’ve created the instance (15:55 – CloudWatch is GMT+2 but event log is UTC), it started with 0 capacity unit (18:03), which means that it was paused (you pay for storage only). Then I connected and the instance was resumed (18:19) to its maximum capacity unit (4 here). And…

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Franck Pachot

Amazon or AWS services?

By | AWS, Cloud | No Comments

By Franck Pachot . When I’m writing about a product I like to be precise about the name, the upper and lower case, and even more: do you know that was taking special care of writing Oracle 12cR2 before then non-italic came with 18c? And that’s also the reason I’m not writing a lot about VMware as it takes me 5 minutes to put the uppercase right 😀 You may have seen that many Amazon…

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Franck Pachot

Amazon DynamoDB Local: running NoSQL on SQLite

By | AWS | No Comments

By Franck Pachot . DynamoDB is a cloud-native, managed, key-value proprietary database designed by AWS to handle massive throughput for large volume and high concurrency with a simple API. simple API: Get, Put, Query, Scan on a table without joins, optimizer, transparent indexes,… high concurrency: queries are directed to one shard with a hash function massive throughput: you can just add partitions to increase the IOPS large volume: it is a shared-nothing architecture where all…

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Daniel Westermann

Attaching your own CentOS 7 yum repository to AWS SSM

By | AWS, Database Administration & Monitoring | No Comments

From some blogs I’ve written in the past you might already know that we are using AWS SSM to patch and maintain the complete EC2 and onprem instances at one of our customers. The previous posts about that topic are here: Avoiding patching madness by using AWS SSM Avoiding patching madness by using AWS SSM A simple Terraform script to create an AWS EC2 playground Schedule reboots of your AWS instances and how that can…

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Christophe Cosme

AWS – RDS – SQL Server Native backups

By | AWS, Cloud, Database Administration & Monitoring, Database management, SQL Server | No Comments

Introduction RDS provide automatic backup feature. This feature will backup the entire RDS instance. As a DBA sometimes you need to backup individual database, they are many reason for that (legal, migration, replication,…). Unfortunately individual database backups are not available within the RDS instance. This post explains how you can enable the native database backup on RDS , as you are used to with an on-premises SQL Server instance. To summarize we will create a…

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Franck Pachot

Oracle Standard Edition on AWS ☁ socket arithmetic

By | AWS, Cloud, Oracle | No Comments

By Franck Pachot . Note that I’ve written previously about Oracle Standard Edition 2 licensing before but a few rules change. This is written in May 2020. TL;DR: 4 vCPU count for 1 socket and 2 sockets count for 1 server wherever hyper-threading is enabled or not. The SE2 rules I think the Standard Edition rules are quite clear now: maximum server capacity, cluster limit, minimum NUP, and processor metric. Oracle has them in the…

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Franck Pachot

AWS Certified Database Specialty (DBS-C01)

By | AWS, Cloud | One Comment

Here is my feedback after preparing and passing the AWS Database Specialty certification. There are tips about the exam but also some thoughts that came to my mind during the preparation when I had to mind-shift from a multi-purpose database system to purpose-built database services. Exam Availability This exam was in beta between last December/January and then was planned for production starting April 6, 2020. I initially planned to take the exam this first day…

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Daniel Westermann

AWS RDS for PostgreSQL – 4 – Changing parameters

By | AWS, Database Administration & Monitoring | No Comments

If you followed that last posts about DB Parameter Groups, Subnet Groups and Setting up the RDS instance you should have a running RDS instance. You should also be aware that changing parameters can not be done like you usually do it but you need to do that by changing the DB parameter groups. In this post we’ll look at how you can do that and, especially, what you should avoid.

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Daniel Westermann

AWS RDS for PostgreSQL – 3 – Creating the RDS PostgreSQL instance

By | AWS, Database Administration & Monitoring | No Comments

In the last tow posts we had a look at DB Parameter Groups and Subnet Groups as these need to be ready when you want to deploy a RDS PostgreSQL instance on AWS. In this post we’ll use these two building blocks to bring up a high available PostgreSQL instance using a master instance in one, and a replica in another availability zone. This is usually what you want when you want a production deployment…

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