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Aleksey Milovidov

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Optimizing Aggregate Functions in ClickHouseHighload fwdays'202020-10-13
The talk examines optimizing the AVG aggregation in ClickHouse for the query SELECT key, avg(value) FROM table GROUP BY key. It analyzes whether that simple…
Talk in Russian on
Flagrant Bugs and How to Avoid Them: The ClickHouse ExampleHighLoad++ 20192019-11-07
Shows real-world bugs encountered when running ClickHouse at large scale, especially processing internet-traffic data, and explains their root causes across…
Talk in Russian on
Live Stream from the Congress Hall, November 8HighLoad++ 20192019-11-07
This is a livestream recording of HighLoad++ 2019 in Moscow (Nov 7–8) containing a series of talks and interviews about high-load system engineering. It…
Talk in Russian
Query Performance Analysis in ClickHouseHighLoad++ Moscow 20182018-11-08
Covers diagnosing slow ClickHouse queries by showing where to look in execution plans and resource usage. Describes techniques and tools to analyze whether a…
Talk in Russian on
ClickHouse: blitz meetup (questions and answers)HighLoad++ Moscow 20182018-11-08
A brief Q&A session about ClickHouse covering practical questions and answers for developers using the ClickHouse columnar OLAP database. The meetup focuses on…
Talk in Russian on
Speeding up LZ4 decompressionHighLoad++ Siberia 20182018-06-25
The talk examines methods to speed up LZ4 decompression. It covers low-level CPU-specific optimizations ("black-magic") and data-science-driven techniques…
Talk in Russian on
ClickHouse capabilities for advanced developersBackend Conf 20182018-05-28
Discusses lesser-known ClickHouse features useful for advanced developers: incremental aggregation and manipulating aggregate-function states, inter-cluster…
Talk in Russian on
Effective Use of ClickHouseHighLoad++ 20172017-11-07
Covers practical experience using the open-source columnar database ClickHouse in production, naming ClickHouse as the technology. Describes common usage…
Talk in Russian on
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