Category Archives: Uncategorized

5 questions for time limited interview for BI developer position that touch almost all areas related to modern Microsoft BI

1. For example it’s necessary to allow user to input worker’s salary but ensure that it’s in range related to the worker’s category. Ranges for categories are stored in a separate table. Data inserted by using T-SQL. Where is the … Continue reading

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Problem unsolvable for Data Lake Analytics

One of the tasks of Database Forensics is to detect events (or categories of events) that began too frequent. From programming perspective, this means that for each date there should be searches categories appearing more than certain number of times … Continue reading

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Restoring objects in SQL Server

This is a code googled in panic after occasional deletion of a stored procedure. Does real magic saving hours of work that could be spent on re-writing:  

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Querying Tabular model XML/A with XPath

There can be various reasons to extract metadata from Tabular model, for example to compose documentation or logical model diagram. The next collections are useful from architectural point of view: list of dimensions, list of measure groups and measures, list … Continue reading

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From SQL to NoSQL to NewSQL

History of RDBMS Every time new technology emerged it’s evolution ended up in realisation as relational system (RDBMS). In other words, the business before adopting the stuff always demanded atomicity, consistency, isolation, and durability (ACID).

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SQL or NoSQL: that is the question.

Relational database management system (RDBMS) have been a primary data storage mechanism for decades. NoSQL databases have existed since the 1960s, but have been recently gaining traction and the business faces a challenge of their efficient adoption. There are many tutorials … Continue reading

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Hadoop Data Processing: Battle For Speed

The idea behind Hadoop шs brilliant and revolutionary: invented an algorithm – MapReduce – allowing decomposition on it of all major data processing tasks (grouping, statistical, graph, etc). However it’s use of input files and lack of schema support prevented the performance improvements … Continue reading

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