Claus Nielsen - Oracle Database Engineer

Q: Where is Claus based?

Claus is based in Thalwil, Switzerland .

Q: What languages does Claus speak?

Claus speaks the following languages: Danish (Native), English (Advanced), German (Intermediate) .

Q: How many years of experience does Claus have?

Claus has at least 38 years of experience. During this time, Claus has worked in at least 11 different roles and for 18 different companies . The average length of individual experience is 2 years and 1 month . Note that Claus may not have shared all experience and actually has more experience.

Q: What is Claus's latest experience?

Claus's most recent position is Oracle Database Engineer at BBV.ch .

Q: What companies has Claus worked for in recent years?

In recent years, Claus has worked for BBV.ch , Sunrise UPC , GULP , Swisscom AG , and Tradeware AG .

Q: Which industries is Claus most experienced in?

Claus is most experienced in industries like Telecommunication , Information Technology , and Transportation . Claus also has some experience in Banking and Finance , Healthcare , and Government and Administration .

Q: Which business areas is Claus most experienced in?

Claus is most experienced in business areas like Information Technology , Product Development , and Business Intelligence . Claus also has some experience in Finance , Operations , and Customer Service .

Q: Which industries has Claus worked in recently?

Claus has recently worked in industries like Information Technology , Banking and Finance , and Telecommunication .

Q: Which business areas has Claus worked in recently?

Claus has recently worked in business areas like Information Technology , Operations , and Audit .

Recommended expert

Thalwil, Switzerland

Experience

Jan 2023 - Dec 2025

3 years

Switzerland

Oracle Database Engineer

BBV.ch

Migration of databases from ODA to ExaData
Migration of databases from ExaData to ExaCC/OCI
Decreased UCC usage by 10%
Developing automation scripts using Python
Performance tuning
Shrunk development databases from 6 TB to 3 TB using Exadata columnar compression
Tuned application performance by 30% using inmemory option
Tuned non-production Exadata by 20% to release CPU resources before ExaCC migration
Database patching of Oracle 19c
Basic Ansible scripting for deployments and database cloning
Developing acconting model for shared Oracle platform
Migrating single-instance databases to Oracle RAC
Analysis of RAC issues
Advising development teams of how to migrate to RAC

Jan 2022 - Dec 2022

1 year

Switzerland

Oracle Database Engineer

Sunrise UPC

Migration of databases to Exadata
Developing automation scripts using Python
Performance tuning
Database patching 12.x -> 19.10
APEX Development

Jan 2021 - Dec 2021

1 year

Switzerland

Oracle Database Engineer

GULP

Oracle Private Cloud Appliance
Developing automation scripts using Python
Performance tuning
Database patching 12.x -> 19.10
Database migration 12.x -> 19.x

Jan 2021 - Dec 2021

1 year

Switzerland

DevOps database audit specialist

Swisscom AG

Jan 2019 - Dec 2021

3 years

Switzerland

Oracle DBA / Sysadmin

Tradeware AG

Credit Suisse: Migration of Datawarehouse infrastructure to Exadata. Migration of 80 Oracle 11.2.0.4 databases to Oracle 19c on Exadata. Provisioning storage cells.
UBS: Sysadmin for 80 ODA and Exadata nodes. Hardware service. Operating system upgrades. Troubleshooting of the Grid Infrastructure software stack.
Migros Bank: DBA Operation on Exadata infrastructure. Multitenant database cloning. Performance issues. Automation.

Jan 2018 - Dec 2019

2 years

Switzerland

Senior Oracle DBA with application focus

Avectris AG

Senior Oracle DBA with application focus for Generali AG.
Migrating several enterprise quality applications from the old IT service provider Avaloq to the Avectris infrastructure.
Analyzing and rewriting application code.
Supporting the development teams in both Avectris and Generali.
Migrating databases and developing database cloning procedures.
Implementation of database cloning in Python using HPE 3PAR storage snapshots.

Jan 2017 - Dec 2018

2 years

Switzerland

Senior Oracle DBA

Rize Recruitment

Migrating Oracle OID to Oracle Fusion 11g
Migrating OEM 11 to Cloud Control 12c
APEX Development
Database Engineering in large environment of 500+ Oracle database
Backup status reports
Security reports
Capacity Management reports

Jan 2015 - Dec 2016

2 years

Zürich, Switzerland

Senior Oracle DBA

Coba IT

Migrating 4000+ databases to Simpana/Comvault
Incident/Problem Management
Performance tuning

Jan 2014 - Dec 2014

1 year

Hewlett Packard

Jan 2013 - Dec 2014

2 years

Switzerland

Senior Oracle DBA

Bosshard & Partner

Incident/Change/Problem Management at Bank Julius Baer
Database migrations
Task forces regarding backup/performance problems
Testing Oracle 12c RDBMS
Capacity Management of disk, CPU and network resources in AIX environment

Jan 2010 - Dec 2013

4 years

Zürich, Switzerland

Senior Oracle Engineer / Associate Vice President

Leonteq AG

Management of the database tier for mission critical Sophis application and migration between different generations of the database platform (40 databases and 8 physical database servers).
Engineering of four generations of Oracle database platforms using technologies like Oracle 10g/11g, Sun V490, Solaris 10, ASM, HP DL 380, Oracle Unbreakable Linux, HP blade servers, Suse Enterprise Linux 11, Oracle Grid Infrastructure, Hitachi SAN, Fiber Channel attached HP MSA 2000, and NetApp FAS 2043.
License management of Oracle installation (support budget 100,000 CHF/year).
Proof of concept and purchase decision of Commvault and Control-M infrastructures.
Migration of business critical applications from Oracle 10g to 11g.
Migration of backup system from diskbased backups to Commvault.
Migration of storage system from ASM to NetApp.
Production support and on-call duty.
Technologies used: Oracle 10g/11g, PL/SQL, Dataguard, Oracle Streams replication, Enterprise Manager 10g/12c, RMAN, VMWare ESX, Suse Enterprise Linux, NetApp Metrocluster, Sun Solaris, Shell scripting.

Jan 2007 - Dec 2010

4 years

Switzerland

Senior Oracle DBA

Swisslinx AG

Rollout and maintenance of a large Grid Control infrastructure for Credit Suisse with about 6,000 individual targets.
Regression testing to ensure Oracle 11g compliance with Credit Suisse standards.
Migration of a 100 TB data warehouse from Oracle 10g to 11g.
Scripting automatic procedures for refreshing development environments using volume manager snapshots.
Production support and on-call duty.
Technologies used: Oracle 10g/11g, Oracle RAC 10g/11g, PL/SQL, Dataguard, Enterprise Manager 10g, Sun Solaris, RMAN, Oracle Application Express, Shell scripting.

Jan 2006 - Dec 2007

2 years

Erding, Germany

DBA

Amadeus IT Group

DBA work on high availability databases for the airline industry.
Migration of 1 TB database from Oracle 9 on HP-UX to Oracle 10g on Suse Enterprise Linux.
Preparation of Linux production environment (SUSE Enterprise Linux) for Oracle 10g (RMAN backup to disk, integration to Tivoli Storage Manager).
Installation of physical standby databases on HP-UX.
Installation of 10g RAC on Linux (Oracle Unbreakable Linux).
Collection and analysis of capacity statistics at instance and session level.
Production support and on-call duty.
Technologies used: Oracle 9i/10g, Dataguard, Enterprise Manager 10g, HP-UX, RAC, Suse Linux, RMAN, Shell scripting, PL/SQL.

Jan 2003 - Dec 2006

4 years

Denmark

DBA

IBM Denmark

DBA work on large Invoicing System for Maersk Sealand (revenue 28 billion USD) based on Oracle Financials AR module.
Incident, Problem and Change processes according to ITIL.
Production support and on-call duty.
General DBA tasks for Sonofon including capacity, storage, and performance tuning.
Technologies used: Oracle 9i/10g, Dataguard, Enterprise Manager 9i, Sun Solaris, RAC, RMAN, PL/SQL, Shell-scripting.

Jan 1998 - Dec 2003

6 years

Denmark

Technical coordinator / DBA / Developer

IT-Konsulenterne ApS

Technical coordinator during conversion of billing system from BSCS5 to BSCS7 for Orange DK A/S.
DBA work in Oracle 7, 8i, and 9i for Orange DK A/S.
Development of mediation systems for GPRS and MMS services.
Test of TAP3 format with external Data Clearing House.
DBA on implementation of Peoplesoft 8 for Orange DK A/S.
Installation of Oracle 9i and design of interfaces to number portability for Telmore.
Training customer in standards for number portability and design of interfaces to Internal Clearing House for ONI (Portugal).
Design, implementation, and test of provisioning gateway to a Nortel DMS100 Exchange for Cabovisaõ (Portugal).
Object Oriented design and programming in Java, JDBC, Oracle, Corba, and Perl for Internal Clearing House international project.
DBA on Oracle 7 for Mobilix A/S.
Technical coordinator during conversion of billing system from BSCS3 to BSCS5 for Mobilix A/S.
Oracle 7 performance optimization and development of tools for automatic test of CDR formats for Mobilix A/S.
Developer during implementation of ASN.1 (TAP3) in the Roameo Data Clearing House for Dan Net.

Jan 1997 - Dec 1998

2 years

Denmark

PC support and developer

InCase Aps

PC support and development of SQL reports on DB2 for IBM/SDC.

Jan 1992 - Dec 1997

6 years

Denmark

Developer / Trainer

Dan Net A/S

Developer for Roameo Data Clearing House, optimization of SQL and design of database interface.
Analysis and development of internet based distribution system for medicine prices for DLI.
Development of TOPAS billing system for interconnect traffic for Tele Danmark EDB.
Development of trouble ticket system for KTAS.
Internal development and internal trainer in DB2 and CSP programming.
Development of Electronic Document Interchange systems for the transport sector.
Technologies used: Oracle 7, IBM AIX, ANSI-C.

Jan 1988 - Dec 1992

5 years

Copenhagen, Denmark

Developer / Project leader / Database Administrator

Port Authority of Copenhagen

Developer for Payroll and Purchase systems.
Project leader for Finance system.
Database Administrator for SQL/DS and CA-UNIVERSE.

Industry Experience

See where this freelancer has spent most of their professional time.

Experienced in Telecommunication, Information Technology, Transportation, Banking and Finance, Healthcare, and Government and Administration.

Telecommunication

Information Technology

Transportation

Banking and Finance

Healthcare

Government and Administration

Business Area Experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Product Development, Business Intelligence, Finance, Operations, and Customer Service.

Information Technology

Product Development

Business Intelligence

Finance

Operations

Customer Service

Summary

Highly skilled Database Engineer with 20 years of professional experience with Oracle technologies. Experience in Oracle Data Guard configuration, Oracle Streams implementation and Oracle database performance tuning. Considerable experience in Oracle Database backup and restore techniques using RMAN including database backup strategies implementation. Experience in implementation and configuration of Oracle Enterprise Manager version 12/13c for both small and very large installations. Extensive experience in Linux (Suse/Redhat) and Solaris system administration. Many years of experience with supporting mission critical database systems for Fortune 500 companies and especially the Financial Industry.

Skills

Unix (Solaris, Linux)
Windows (W2k, Xp, Win7)
Ansi-c
Csp
Pl/sql
Shell-script (Awk, Ksh, Sh, Bash, Perl)
Java
Python
Oracle 7
Oracle 8
Oracle 8i
Oracle 9
Oracle 10
Oracle 11g
Oracle 12c
Oracle 19c
Mssql 2008 (Basic)
Postgres (Basic)
Ibm Websphere Mq Series
Oracle Grid Control 12c
Oracle Grid Control 13c
Oracle Golden Gate 12g
Oracle Rac
Oracle Dataguard
Oracle Cloud Infrastructure
Apex
Commvault Backup (Basic Engineering)
Control-m Batch Scheduler (User Level)
Vmware Esx (Basic Engineering)
Amazon Aws Rds
Netapp (Basic Engineering)
Ansible (Basic)

Languages

Danish

Native

English

Advanced

German

Intermediate

Certifications & licenses

Oracle 11g OCP DBA

Oracle 9i Certified Master

Oracle10g OCP DBA

ITIL Foundation Certification

Oracle9i OCP DBA

Oracle8i OCP DBA

Oracle8 OCP DBA

Oracle7 OCP DBA

Statistics

Experience

Total positions 18

Experience in Telecommunication 17 y

Avg length 2 y 9 m

Longest experience 5 y 11 m

Global Experience

Countries worked in 3 (Switzerland, Denmark, Germany)

Primary country Switzerland

Expertise

Recent roles Oracle Database Engineer, DevOps database audit specialist, Oracle DBA / Sysadmin

Main industries Telecommunication, Information Technology, Transportation

Main business areas Information Technology, Product Development, Business Intelligence

Qualifications

Certifications earned 8

Profile

Created

February 2026

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Claus based?

Claus is based in Thalwil, Switzerland.

What languages does Claus speak?

Claus speaks the following languages: Danish (Native), English (Advanced), German (Intermediate).

How many years of experience does Claus have?

Claus has at least 38 years of experience. During this time, Claus has worked in at least 11 different roles and for 18 different companies. The average length of individual experience is 2 years and 1 month. Note that Claus may not have shared all experience and actually has more experience.

What roles would Claus be best suited for?

Based on recent experience, Claus would be well-suited for roles such as: Oracle Database Engineer, DevOps database audit specialist, Oracle DBA / Sysadmin.

What is Claus's latest experience?

Claus's most recent position is Oracle Database Engineer at BBV.ch.

What companies has Claus worked for in recent years?

In recent years, Claus has worked for BBV.ch, Sunrise UPC, GULP, Swisscom AG, and Tradeware AG.

Which industries is Claus most experienced in?

Claus is most experienced in industries like Telecommunication, Information Technology, and Transportation. Claus also has some experience in Banking and Finance, Healthcare, and Government and Administration.

Which business areas is Claus most experienced in?

Claus is most experienced in business areas like Information Technology, Product Development, and Business Intelligence. Claus also has some experience in Finance, Operations, and Customer Service.

Which industries has Claus worked in recently?

Claus has recently worked in industries like Information Technology, Banking and Finance, and Telecommunication.

Which business areas has Claus worked in recently?

Claus has recently worked in business areas like Information Technology, Operations, and Audit.

Does Claus have any certificates?

Claus has 8 certificates. Among them, these include: Oracle 11g OCP DBA, Oracle 9i Certified Master, and Oracle10g OCP DBA.

What is the availability of Claus?

Claus is immediately available for suitable projects.

What is the rate of Claus?

Claus's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.