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Full Name
Johannes Ahrends
Full Name
ACE Pro
Top Level Details
Job Role
Technical Director
Company
CarajanDB
Country
Germany
Top Expertise
Oracle Multitenant
Focus Area
Database
About Johannes
Oracle Expert for more than 30 years with special focus on High Availability, Replication, Migration and Upgrade. I'm still a fan of Standard Edition and lover of Multitenant Database. In October 2011 I established my own company CarajanDB with a strong focus on the Oracle Database technology. Together with Martin Klier, Axel vom Stein, Oliver Pyka, Robert Marz and Markus Flechtner I am Founder and Bord Member of ora2know the new german Oracle user group.
Expertises
Oracle Multitenant
Standard Edition High Availability
Real Applications Clusters (RAC)
Oracle Data Guard
GoldenGate
Backup and Recovery
Home Page
http://www.carajandb.com
Oracle Community
https://community.oracle.com/tech/developers/profile/Johannes%20Ahrends
Links
Latest Contributions
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The Battle: Multitenant
Nov 20, 2025 - Presentation - in-person or virtual - DOAG Conference 2025
Oracle Multitenant
Migration
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Meine Anwendung ist langsam, die Datenbank ist Schuld
Nov 18, 2025 - Presentation - in-person or virtual - DOAG Conference 2025
SQL Performance
Oracle Tuning Pack
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Oracle AI World Follow Up – Follow Up
Oct 28, 2025 - Blog post -
Oracle AI Data Platform
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