IT Career Guides & Free Resources
Expert roadmaps, tutorials, salary guides and interview prep across Data Science, Generative AI, Python, Cloud & Analytics — written by GloryTecks trainers in Hyderabad.
All articles
Power BI Performance Tuning: Make Reports Faster
A method for making Power BI reports faster: measure first with Performance Analyzer and read its DAX query, visual display and other timings, then shrink the import model, reduce column cardinality on a real retail dataset, write lighter DAX, filter and simplify pages, and check capacity and gateways.
Fine-Tuning vs RAG: Which Should You Choose?
Fine-tuning and RAG are often presented as rivals. They change different things: retrieval gives a model facts to read, and fine-tuning changes how it behaves. This guide shows the difference with a test on a local model, summarises the research and gives an order to try things in.
Hyperparameter Tuning: Grid Search vs Random Search vs Bayesian
Grid search, random search and Bayesian optimisation compared on one real model with the same budget of 24 candidates: how close they came, why the differences sat inside the noise between folds, why random search explores more, and a second model where tuning made the difference between 61% and 93% accuracy.
Spark Performance Tuning: Shuffles, Joins and Caching
A practical guide to Spark performance: reading the physical plan, why 200 shuffle partitions became one under adaptive query execution, how Spark chooses broadcast or sort-merge joins and how hints change it, what skew looks like in real partition sizes, when caching pays, and a tuning checklist.
Redshift Performance Tuning: Distribution and Sort Keys
Redshift performance tuning starts with two table properties: how rows are distributed across slices and how they are sorted on disk. This guide explains the four distribution styles and the sort key options, simulates block skipping and slice skew on 2.96 million real rows, and shows when AUTO is the right answer.
ADF Performance Tuning: DIUs and Parallelism
Raising DIUs is the reflex when a Copy activity is slow, and it is often the wrong move. This guide explains what Data Integration Units and parallel copies control, their documented defaults and limits, how billing responds, when staged copy helps, and how to read the monitoring view to find the real bottleneck.