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Full Name
Andrej Pashchenko
Full Name
ACE Pro
Top Level Details
Job Role
Data Engineering Associate Manager
Company
Accenture
Country
Germany
Top Expertise
Structured Query Language (SQL)
Focus Area
Database
About Andrej
Andrej Pashchenko started his IT career in the early 1990s and has been working with Oracle Database since 1999. Over the past 15 years, he has focused on consulting, supporting customer projects in the areas of data warehousing, data modeling, ETL, and SQL performance. He has been actively sharing his knowledge since 2011 through blogging, speaking at international conferences, and teaching, helping others get the best out of Oracle Database. For his technical expertise and his long-standing commitment to knowledge sharing, Oracle has recognized him as an Oracle ACE Pro.
Expertises
Structured Query Language (SQL)
Data Warehouse
Database
Performance
Procedural Language for SQL (PL/SQL)
Extract, Transform and Load (ETL)
Links
Latest Contributions
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Exadata für Entwickler: Best Practices und Worst Cases verstehen
Nov 19, 2025 - Presentation - in-person or virtual - DOAG Conference 2025
Exadata
Database Development
Performance
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Merging Matters: MERGE bis UPDATE FROM – Daten effizient übernehmen in Oracle
Nov 19, 2025 - Presentation - in-person or virtual - DOAG Conference 2025
Oracle SQL
Database Development
Oracle PL/SQL
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Fix Optimizer Estimate Issues from Implicit Conversions #JoelKallmanDay
Oct 15, 2025 - Blog post -
Optimizer
Performance
Oracle SQL
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MERGE and DML RETURNING clause in Oracle 23ai
May 08, 2025 - Blog post -
Oracle SQL
Database Development
Oracle PL/SQL
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ORA-30926 in Oracle 23ai: What’s Changed?
Apr 21, 2025 - Blog post -
Database Development
Oracle SQL
Database 23ai
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