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.
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Parquet vs ORC vs Avro: File Formats Compared
How Parquet, ORC and Avro differ and when to use each: row-based versus columnar layouts, the same 500,000 real taxi trips written as CSV, Avro, Parquet and ORC with measured file sizes, how much of a Parquet file one column occupies, schema evolution, splitting, and a choice guide.
Parquet and Partitioning for Cheaper Athena Queries
Athena bills by the bytes each query scans, so file format decides most of the bill. This guide measures a real 2,964,624-row taxi file as CSV, gzipped CSV and Parquet, shows how few bytes a two-column query needs in a columnar file, and gives the CTAS statement that converts a table, with the limits to know.