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Vojtěch Šíma | The Data Bender | Power BI & Fabric
Vojtěch Šíma | The Data Bender
Microsoft Fabric
Deep dives into Microsoft Fabric architecture, including Lakehouse, SQL Analytics Endpoints, Notebooks, and OneLake management.


Direct Lake pod kapotou: Transcoding, Framing, Residency, a Eviction
Tento článek se zaměřuje na to, jak Direct Lake funguje v praxi, především ve variantě Direct Lake on OneLake. Věnuje se framingu Delta tabulek, Parquet row groups, transcodingu do VertiPaq, residency a eviction segmentů, prewarmingu a spotřebě CU ve srovnání s Import režimem.
Vojtěch Šíma
5 hours ago19 min read


Direct Lake Internals: Transcoding, Framing, Residency, and Eviction
This article examines how Direct Lake works in practice, with a focus on Direct Lake on OneLake. It covers Delta-table framing, Parquet row groups, transcoding into VertiPaq, segment residency and eviction, prewarming, and CU consumption compared with Import.
Vojtěch Šíma
23 hours ago20 min read


Automatická údržba delta tabulek ve Fabric Lakehouse (bez PySparku)
Aby byla údržba Delta tabulek správná, musíš nejdřív pochopit transakční log, checkpointy a vliv write amplification na úložiště. Článek rozebírá fyzickou architekturu Delta tabulek a ukazuje automatizaci kontrol zdraví, operací VACUUM a OPTIMIZE pomocí Python knihovny delta-rs v Microsoft Fabric. Nabízí tak lehkou alternativu k údržbě založené na Sparku.
Vojtěch Šíma
Feb 1510 min read


Automated Delta Table Maintenance in Fabric Lakehouse (Without PySpark)
To properly maintain Delta Tables, you first need to understand the transaction log, checkpoints, and how write amplification affects storage. This post breaks down the physical architecture of Delta Tables and demonstrates how to automate health checks, VACUUM, and OPTIMIZE operations using the delta-rs Python library in Microsoft Fabric, offering a lightweight alternative to Spark-based maintenance.
Vojtěch Šíma
Feb 1413 min read
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