An experimental setup for my master thesis "Optimizing web extraction queries for robustness"

Contains implementations of various algorithms for database query optimization. The algorithms cover multiple problem variants (e.g., traditional and multi-objective query optimization) and offer different tradeoffs between optimality guarantees and optimization time (e.g., fast randomized algorithms, approximation schemes, exhaustive algorithms…

PL/SQL Query and structure optimizations

An Oracle Database Project

Case Study for a data engineering job application at a company

Source code associated with Master Thesis "Integration of Structure Guided Query Optimization into NewSQL Databases"

Spanning Tree-based Query Plan Enumeration

This project focuses on scalable data processing and query performance optimisation. It uses Snowflake for data warehousing, GCP Cloud Functions for serverless compute, and Apache Kafka for real-time data streaming. It leverages the serverless capabilities of the systems for scalability and performance.

Implementation of papers on query translation

Simpli-Squared is a statistics-free join ordering algorithm Without Cardinality Estimates.

Enhance the performance and cost-efficiency of large-scale Retrieval Augmented Generation (RAG) applications. Learn to integrate vector search with traditional database operations and apply techniques like prefiltering, postfiltering, projection, and prompt compression.

Evaluation code for Automated Query Expansion using High Dimensional Clustering

Optimiser and Estimator classes for a Simple RDBMS

Stocker: A Stock Tracking and Related News Website based on a MySQL database, as well as using some NoSQL techniques.

torch-like convolution over binary trees

Homework for Query Optimization - a TUM Computer Science Course

Project on MapReduce for the Μ111 - Big Data Management course, NKUA, Spring 2023.

Database system built from scratch, Select-Project-Join Query Engine

Implementation of the Radix Hash Join (RHJ) algorithm