https://zoltanmajnek.github.io/gallery/categories/nosql/ Recent content in NoSQL on Home Hugo -- gohugo.io en majnek.zoltan@gmail.com (Zoltan Majnek) majnek.zoltan@gmail.com (Zoltan Majnek) © Zoltan Majnek Wed, 12 Aug 2026 00:00:00 +0200 https://zoltanmajnek.github.io/gallery/runinto/ Wed, 12 Aug 2026 00:00:00 +0200majnek.zoltan@gmail.com (Zoltan Majnek) https://zoltanmajnek.github.io/gallery/runinto/ <img src="https://zoltanmajnek.github.io/gallery/runinto/0_hu_986eebb7a3ab2928.png" /> <p>[A cross-platform mobile application designed for user networking and real-time messaging, featuring GPS location tracking, Firebase Cloud Messaging (FCM) push notifications, and hybrid NoSQL data persistence powered by Neo4j and Firebase. I integrated Firebase Realtime Database to manage live data synchronization for the location and messaging features, while utilizing Neo4j to model and query the complex network of relationships. The gallery below includes excerpts from my academic paper, structural overviews of the solution, and core C# and XAML implementations. Click here to see the App in Action](https://youtube.com/shorts/KCAALVRFGHE)</p> https://zoltanmajnek.github.io/gallery/oracle/ Mon, 01 Jun 2026 00:00:00 +0200majnek.zoltan@gmail.com (Zoltan Majnek) https://zoltanmajnek.github.io/gallery/oracle/ <img src="https://zoltanmajnek.github.io/gallery/oracle/2_hu_ba63814295427fdc.jpg" /> <p>This project is an application registry database, initially built in Oracle SQL and later migrated to Neo4j. The core dataset-containing information about applications, developers, and programming languages-was sourced from Kaggle. Some of the raw CSV and XLS files contained millions of rows. I built a custom data preparation pipeline to handle the raw CSV files. Using custom C# scripts, I cleaned formatting errors, normalized the structures, and merged the datasets into an import-ready format. The initial import process generated the base CREATE SQL statements, which I then manually refined to set up the proper relational schema. Once the Oracle database was running, I wrote and optimized various queries, applying indexing to improve execution times. The domain involved many-to-many (N:M) relationships, so I chose Neo4j for the next phase. I handled the data export-import process to migrate everything from Oracle to Neo4j and built graph visualizations to map out the connections. The entire workflow, from data cleaning to the final graph models, was documented in a 30-page technical report, accompanied by a 20-page appendix containing all the C# and database scripts.</p>