ClickHouse | ClickHouse® is a free analytics DBMS for big data | Database library

 by   ClickHouse C++ Version: v23.4.3.48-stable License: Apache-2.0

kandi X-RAY | ClickHouse Summary

kandi X-RAY | ClickHouse Summary

ClickHouse is a C++ library typically used in Database applications. ClickHouse has no bugs, it has a Permissive License and it has medium support. However ClickHouse has 11 vulnerabilities. You can download it from GitHub.

ClickHouse is an open-source column-oriented database management system that allows generating analytical data reports in real-time.
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            kandi-support Support

              ClickHouse has a medium active ecosystem.
              It has 29274 star(s) with 5774 fork(s). There are 677 watchers for this library.
              There were 10 major release(s) in the last 12 months.
              There are 2955 open issues and 13121 have been closed. On average issues are closed in 133 days. There are 393 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of ClickHouse is v23.4.3.48-stable

            kandi-Quality Quality

              ClickHouse has 0 bugs and 0 code smells.

            kandi-Security Security

              OutlinedDot
              ClickHouse has 11 vulnerability issues reported (1 critical, 6 high, 4 medium, 0 low).
              ClickHouse code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              ClickHouse is licensed under the Apache-2.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              ClickHouse releases are available to install and integrate.
              It has 168926 lines of code, 5061 functions and 1980 files.
              It has high code complexity. Code complexity directly impacts maintainability of the code.

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            ClickHouse Key Features

            No Key Features are available at this moment for ClickHouse.

            ClickHouse Examples and Code Snippets

            No Code Snippets are available at this moment for ClickHouse.

            Community Discussions

            QUESTION

            Choose an SQL driver at runtime in Golang when drivers have the same name
            Asked 2022-Mar-28 at 14:53

            I'd like to know if there is an approach or projection pattern to be able to choose SQL driver at runtime in Golang when both of these drivers have the same name. I want to switch between HTTP ClickHouse driver (https://github.com/mailru/go-clickhouse) and native TCP ClickHouse driver (https://github.com/ClickHouse/clickhouse-go) using an environment variable.

            ...

            ANSWER

            Answered 2022-Mar-28 at 14:53

            Since version 2 of mailru/go-clickhouse it is possible to use both of them, authors have changed driver name to chhttp: https://github.com/mailru/go-clickhouse/issues/151

            Source https://stackoverflow.com/questions/70683405

            QUESTION

            Clickhouse Kafka engine on cluster
            Asked 2022-Mar-13 at 12:04

            I'm playing with Kafka engine on ClickHouse cluster. At the moment ClickHouse 22.1 cluster and Kafka are run in Docker. Here are configurations: https://github.com/apanasevich/clickhouse-etl-cluster

            Here are DDL for Kafka integration:

            ...

            ANSWER

            Answered 2022-Mar-13 at 12:04

            The problem was that DDL for view was incorrect. Unfortunately, it somehow warked for MergeTree engine but didn't work forReplicatedMergeTree one.

            This is the corrected script:

            Source https://stackoverflow.com/questions/71426336

            QUESTION

            How to send multiple arguments to Executable UDF in ClickHouse?
            Asked 2022-Mar-01 at 14:00

            I've a python script that outputs the input:

            ...

            ANSWER

            Answered 2022-Mar-01 at 14:00

            Use multiple tag in function config (python_function.xml in /etc/clickhouse-server:

            Source https://stackoverflow.com/questions/71236415

            QUESTION

            Why is Clickhouse slower than PostgreSQL?
            Asked 2022-Feb-21 at 15:21

            I want to use Clickhouse as an OLAP and PostgreSQL as an OLTP database.

            The problem is that queries to Clickhouse run slower than on Postgres. The query is as below:

            ...

            ANSWER

            Answered 2022-Feb-20 at 21:45

            There are ways to shoot your feet with Clickhouse

            Source https://stackoverflow.com/questions/71192475

            QUESTION

            Clickhouse: Should i optimize MergeTree table manually?
            Asked 2022-Jan-27 at 17:21

            I have a table like:

            create table test (id String, timestamp DateTime, somestring String) ENGINE = MergeTree ORDER BY (id, timestamp)

            i inserted 100 records then inserted another 100 records and i run select query select * from test clickhouse returning with 2 parts their lengths are 100 and they are ordered in themselves. Then i run the query optimize table test and it started to return with 1 part and its length is 200 and ordered. So should i run optimize query after all insert and does it increase select query performance like select count(*) from test where id = 'foo' ?

            ...

            ANSWER

            Answered 2022-Jan-27 at 17:13

            Usually not, you can rely on Clickhouse background merges.

            Also, Clickhouse has no intention to merge all the data from the partition into one part file, because "over-optimization" can affect performance too

            Source https://stackoverflow.com/questions/70882701

            QUESTION

            How to correctly set a path to default config for clickhouse backup?
            Asked 2022-Jan-25 at 14:31

            I'm setting up clickhouse-backup utility locally. I go through the installation steps and now I'm stuck on the step with changing settings for '.config.yml' file.

            I ran sudo ./clickhouse-backup create from the folder where I decompressed the utility and could found created backup in /var/lib/clickhouse/backup

            When I execute:

            ...

            ANSWER

            Answered 2022-Jan-25 at 14:31

            ./clickhouse-backup default-config this command generates a template for the config with default settings.

            try

            Source https://stackoverflow.com/questions/70842768

            QUESTION

            In clickhouse, how can I separate number by comma?
            Asked 2022-Jan-25 at 14:19

            In clickhouse, how can I separate number by comma?

            ...

            ANSWER

            Answered 2022-Jan-25 at 14:19

            Such formatting to strings from numbers is not implemented.

            Source https://stackoverflow.com/questions/70844741

            QUESTION

            Error running ClickHouse Docker on MacBook M1
            Asked 2022-Jan-19 at 06:31

            I'm running ClickHouse Docker image on MacBook M1 and getting the following error.

            ...

            ANSWER

            Answered 2021-Nov-03 at 13:47

            Have you tried adding --platform linux/amd64 in the run command?

            Source https://stackoverflow.com/questions/69809480

            QUESTION

            Why is ClickHouse dictionary performance so low?
            Asked 2022-Jan-17 at 14:54

            I have a table with products names in PostgreSql database. Total rows is ~30M. And I have history of prices in ClickHouse. I want to join names to prices. DDL to create dictionary:

            ...

            ANSWER

            Answered 2022-Jan-17 at 14:54

            Such optimization is not implemented, yet.

            Initially supposed that dictionaries to be used with only dictGet functions.

            Table representation were introduced much later.

            Internally Dictionaries are the set of hash tables -- if your dictionary has 50 attributes then it will be 50 hash tables. These hash tables are very fast if you do seek by key, but very slow if you need to find the next element.

            Right now the query SELECT name FROM products_dict WHERE product_id IN ('97646239') is executed in very straightforward way, though it could be converted into dictGet under the hood.

            Source https://stackoverflow.com/questions/70736685

            QUESTION

            How can I decline an INSERT when column is set to NOT NULL
            Asked 2022-Jan-05 at 15:20

            From the documentation, you have to put a NOT NULL modifier in the column definition to mark it as such, just like for other SQL databases.

            Consider this table:

            ...

            ANSWER

            Answered 2022-Jan-05 at 14:55

            Clickhouse behaviour with Not Null constraints is not compatible with other databases.

            You can overcome it using check constraints https://clickhouse.com/docs/en/sql-reference/statements/create/table/#constraints

            Source https://stackoverflow.com/questions/70589536

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install ClickHouse

            You can download it from GitHub.

            Support

            Official website has a quick high-level overview of ClickHouse on the main page.Tutorial shows how to set up and query a small ClickHouse cluster.Documentation provides more in-depth information.YouTube channel has a lot of content about ClickHouse in video format.Slack and Telegram allow chatting with ClickHouse users in real-time.Blog contains various ClickHouse-related articles, as well as announcements and reports about events.Code Browser (Woboq) with syntax highlight and navigation.Code Browser (github.dev) with syntax highlight, powered by github.dev.Contacts can help to get your questions answered if there are any.
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