• ClickHouse 1.1.54245 release

      Few weeks ago Yandex released ClickHouse 1.1.54245 that included a number of features requested by community. The new deb packages are available from Yandex repo and RPMs from Altinity repo. So let’s see what’s new in this release. New features Distributed DDLs (see CREATE TABLE ON CLUSTER ) New table engine Dictionary that allows[…]

  • ClickHouse AggregateFunctions and Aggregate State

    Jul 10, 2017   
    The guest article from ClickHouse evangelist Yegor Andreenko (@f1yegor) about an interesting extension of aggregate functions aggregate states, that can be used to pre-aggregate data that usually has to be kept in raw, like uniques.

  • ClickHouse vs Amazon RedShift Benchmark #2: STAR2002 dataset

    Jul 3, 2017   
    We continue to benchmark ClickHouse against other analytic DBMSs. We were inspired by the benchmark with star2002 experiment dataset described here, and decided to replicate it using ClickHouse. That gives another interesting comparison vs Amazon RedShift.

  • ClickHouse in a general analytical workload (based on Star Schema Benchmark)

    Jun 26, 2017   
    In this blog post, we’ll look at how ClickHouse performs in a general analytical workload using the star schema benchmark test.

  • ClickHouse vs Amazon RedShift Benchmark

    ClickHouse vs Amazon RedShift Benchmark

    Jun 19, 2017   
    We continue benchmarking ClickHouse. In this article we discuss a benchmark against Amazon RedShift.

  • ClickHouse Data Distribution

    Jun 5, 2017   
    ClickHouse data distribution and replication are fundamental techniques for building reliable and scalable ClickHouse systems. In this article we will explain how it works from the user perspective

  • ClickHouse Release Notes

    ClickHouse is an exellent DBMS with very smart people working on it. Unfortunately, it still lacks some important communication procedures, and arguable the most wanted one is release notes. 

    Altinity mission is to make ClickHouse use easy for everbody, and we will try to fill the gap between Yandex and end users. 

    Below are release notes that Yandex team presented at the recent meetup in Ekaterinburg. It includes changes and new features appeared in latest 1.1.54231 release as well as some others that were not yet documented or publically explained.

  • Altinity ClickHouse Repository

    We are pleased to announce that Altinity repository hosting ClickHouse RHEL/CentOS RPMs as well as packages for Fedora is available at packagecloud

  • ClickHouse Dictionaries Benchmarking

    Apr 26, 2017   
    There are few ClickHouse benchmarks in the web already. Most of them use denormalized database schema. However, in denormalization is not always possible or desirable. In this article we will compare the query performance between denormalized and normalized schema where normalization is modelled using unique ClickHouse external dictionaries feature.

  • ClickHouse Dictionaries Explained

    Apr 12, 2017   
    One of the most useful ClickHouse features is external dictionaries. They are extremely powerful, and if used efficiently may lead to quite elegant designs. I will lead you through the dictionaries using few examples that highlight basic and advanced usage scenarios. So let’s begin.