Latency test from Client to Oracle DB: Minimum number of rows fetched in...
Some time ago I wrote a Blog on how to calculate the network latency fetching a row to a Client from an Oracle database. The tool I used was sqlcl, because it just requires Java and hence no Oracle...
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VirtualBox on Mac Host: High CPU utilization for idle VM
Many people in the IT industry do use VirtualBox as a Type-2 Hypervisor to test software in virtual machines. I’m using it with Vagrant on my Macbook Pro 2019 (Intel with Ventura 13.2. when writing...
View ArticleConsiderations when backing up from the Oracle Standby Database (Data Guard)...
To reduce load on the Primary DB in a Data Guard configuration you may decide to do your rman backups from the Standby site. A very common approach today is to use NFS as the backup location,...
View ArticleOracle: Is it possible to setup a system that a client (specific IP address)...
Problem description In a recent consulting assignment I got the following task: A server with a specific IP address (Application server or Oracle Client) should be able to connect to a specific...
View ArticlePatching ODA to 19.18.: Error in sshd_config
I recently patched an Oracle Database Appliance (ODA) from 19.16. to 19.18. Detailed steps on how to patch to 19.18. are available here. During the update-server step I got the following error: #...
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Installing Oracle 23c Free developer release on Proxmox
Oracle provides an OVA (Open Virtual Appliance) file to install the 23c Free Developer Release on Virtualbox. An OVA file contains metadata and file elements in the Open Virtual Format (OVF) to...
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Building a transportable Oracle Sandbox environment for an Apple Silicon...
Since Apple released their Apple Silicon Laptops based on the ARM processor architecture, it became difficult for Consultants with such a device to run their Oracle Sandbox environment, because the...
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Running an Oracle Database 19c on Apple Silicon (Apple Macbook Air M1)
By end of June 2023 Oracle announced the availability of Oracle 19c for the Arm-architecture (aarch64). Consultants and DBAs, who do use a Mac Laptop with Apple Silicon (M1 or M2), have waited quite a...
View ArticleOracle Database Appliance (ODA): Some listeners do not start anymore when...
A colleague of mine had the issue some time ago and I recently experienced the same behaviour at a customer’s ODA: A couple of Listeners did not start when booting. Starting them as user grid with...
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What is the fastest method to connect to an Oracle database?
There are still applications around, which do connect to the database, do some stuff and then disconnect again. I.e. for each and every operation a logon to the database is necessary. This produces...
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