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Full Name
Markus Flechtner
Full Name
ACE Pro
Top Level Details
Job Role
Principal Consultant
Company
ORDIX AG
Country
Germany
Top Expertise
Database
Focus Area
Database
About Markus
Markus Flechtner is a Senior DBA with more than 30 years experience in the field of Oracle databases. He started as a developer (Oracle Forms, Oracle Reports, PL/SQL) in the 1990’s. Later he spent some years at Oracle Support (Field Support). After some years as a database administrator at a credit agency with some High Availability databases (Oracle RAC, Oracle DataGuard) he joined a consulting company in 2008. Since 2022, he’s a Principal Consultant at ORDIX AG at Cologne (Germany). He is specialized on Oracle Real Application Clusters Oracle Multitenant and database upgrade and migration projects. One of his largest projects was setting up a 26-node RAC cluster with 5 large databases (10 – 30 TB) for an US based telecommunication provider. He is a frequent speaker at national and international conferences like Oracle Open World, IOUG COLLABORATE, UKOUG Tech, nlOUG Tech Experience and the DOAG annual conferences. He is blogging in German (markusdba.de) and English (markusdba.net). Markus is a delegate for the annual DOAG meeting and Co-Founder of ora2know (ora2know.de). Markus is co-author of the (german) book „Der Oracle DBA“ which was published in 2016. He contributed the chapters “Multitenant”, “Globalization Support” and “Database Upgrades” to the book.
Expertises
Database
Real Applications Clusters (RAC)
Oracle Multitenant
Upgrade / Migration
Home Page
https://www.markusdba.net/
Oracle Community
https://community.oracle.com/tech/developers/profile/Markus%20Flechtner
Cloud Customer Connect
https://community.oracle.com/people/Markus%20Flechtner
Links
Latest Contributions
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Panel discussion on database migration
Nov 19, 2025 - Presentation - in-person or virtual - DOAG Conference 2025
Upgrade / Migration
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Wer weiss denn sowas? - DOAG-Edition, die 6.
Nov 18, 2025 - Presentation - in-person or virtual - DOAG Conference 2025
Database 19c
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Multitenant & Data Guard - was kann da schon schiefgehen
Nov 18, 2025 - Presentation - in-person or virtual - DOAG Conference 2025
Database 19c
Oracle Multitenant
Data Guard
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Battle: Multitenant - yes or no?
Nov 18, 2025 - Presentation - in-person or virtual - DOAG Conference 2025
Oracle Multitenant
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Oracle RAC & Multitenant: Fun with UNDO Tablespaces
Aug 26, 2025 - Blog post -
Oracle Multitenant
Real Applications Clusters (RAC)
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Question on Oracle 23ai on a Non-Engineered-System
Jul 30, 2025 - Forum contributions -
Database 23ai
Installation / Patching
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Question on Flashback in a Data Guard Environment
Jul 28, 2025 - Forum contributions -
Oracle Data Guard
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GUI for Oracle Database 21c (Database Control)
Jul 14, 2025 - Forum contributions -
Oracle Database (EE)
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Question on disk sizes for ASM
Jul 08, 2025 - Forum contributions -
Automatic Storage Management (ASM)
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Question on the availability of Oracle Database 23ai SE2 for Oracle Linux 9 (Non-Engineered Systems)
Jun 27, 2025 - Forum contributions -
Database 23ai
Installation / Patching
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Different users, different users, different results
Jun 23, 2025 - Blog post -
Database Administrator (DBA)
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Question on PDB-Level SYSDBA privileges and password file
Jun 17, 2025 - Forum contributions -
Database Security
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The ORACLE_HOME-Directory in the database
Jun 15, 2025 - Blog post -
Database
Installation / Patching
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Installing Oracle Client 19c on Oracle Linux 9
Jun 06, 2025 - Blog post -
Installation / Patching
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Question if bug 36551493 is fixed in 19.27
May 08, 2025 - Forum contributions -
Installation / Patching
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