clickhouse | A Ruby database driver for Clickhouse

by archan937 JavaScript Version: Current License: MIT

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | clickhouse Summary

clickhouse is a JavaScript library. clickhouse has no bugs, it has a Permissive License and it has low support. However clickhouse has 8 vulnerabilities. You can download it from GitHub.

ClickHouse is a high-performance column-oriented database management system developed by Yandex which operates Russia's most popular search engine. ClickHouse manages extremely large volumes of data in a stable and sustainable manner. It currently powers Yandex.Metrica, world’s second largest web analytics platform, with over 13 trillion database records and over 20 billion events a day, generating customized reports on-the-fly, directly from non-aggregated data. This system was successfully implemented at CERN’s LHCb experiment to store and process metadata on 10bn events with over 1000 attributes per event registered in 2011. On June 15th 2016, Yandex open-sourced their awesome project giving the community a powerful asset which can compete with the big players like Google BigQuery and Amazon Redshift with an important advantage: the client can use ClickHouse in its infrastructure and does not have to pay for the cloud (read more).

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Quality

Security

License

Reuse

Support

clickhouse has a low active ecosystem.

It has 83 star(s) with 35 fork(s). There are 6 watchers for this library.

It had no major release in the last 6 months.

There are 13 open issues and 1 have been closed. There are 13 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of clickhouse is current.

Quality

clickhouse has 0 bugs and 0 code smells.

Security

clickhouse has 8 vulnerability issues reported (3 critical, 2 high, 3 medium, 0 low).

clickhouse code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

clickhouse is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

clickhouse releases are not available. You will need to build from source code and install.

Installation instructions, examples and code snippets are available.

Top functions reviewed by kandi - BETA

kandi has reviewed clickhouse and discovered the below as its top functions. This is intended to give you an instant insight into clickhouse implemented functionality, and help decide if they suit your requirements.

Default prefilter implementation .
Handles mouse click events
Searches for a single selector and returns an array of matches .
Defines options for this editor .
Create a DOM fragment
Play animation animation .
Called when we re done
Creates a new matcher instance .
Registers event handlers for mouseup events .
Represents the CodeMirror editor .

Get all kandi verified functions for this library.

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

Trending Discussions on clickhouse

Choose an SQL driver at runtime in Golang when drivers have the same name

Clickhouse Kafka engine on cluster

How to send multiple arguments to Executable UDF in ClickHouse?

Why is Clickhouse slower than PostgreSQL?

Clickhouse: Should i optimize MergeTree table manually?

How to correctly set a path to default config for clickhouse backup?

In clickhouse, how can I separate number by comma?

Error running ClickHouse Docker on MacBook M1

Why is ClickHouse dictionary performance so low?

How can I decline an INSERT when column is set to NOT NULL

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

CVE-2019-15024 MEDIUM

In all versions of ClickHouse before 19.14.3, an attacker having write access to ZooKeeper and who is able to run a custom server available from the network where ClickHouse runs, can create a custom-built malicious server that will act as a ClickHouse replica and register it in ZooKeeper. When another replica will fetch data part from the malicious replica, it can force clickhouse-server to write to arbitrary path on filesystem.

https://clickhouse.yandex/docs/en/security_changelog/

CVE-2019-16535 CRITICAL

In all versions of ClickHouse before 19.14, an OOB read, OOB write and integer underflow in decompression algorithms can be used to achieve RCE or DoS via native protocol.

https://clickhouse.yandex/docs/en/security_changelog/

CVE-2019-18657 MEDIUM

ClickHouse before 19.13.5.44 allows HTTP header injection via the url table function.

https://github.com/ClickHouse/ClickHouse/pull/6466

https://github.com/ClickHouse/ClickHouse/blob/master/CHANGELOG.md

https://github.com/ClickHouse/ClickHouse/pull/7526/files

CVE-2018-14671 CRITICAL

In ClickHouse before 18.10.3, unixODBC allowed loading arbitrary shared objects from the file system which led to a Remote Code Execution vulnerability.

https://clickhouse.yandex/docs/en/security_changelog/

CVE-2018-14668 HIGH

In ClickHouse before 1.1.54388, "remote" table function allowed arbitrary symbols in "user", "password" and "default_database" fields which led to Cross Protocol Request Forgery Attacks.

https://clickhouse.yandex/docs/en/security_changelog/

CVE-2018-14670 CRITICAL

Incorrect configuration in deb package in ClickHouse before 1.1.54131 could lead to unauthorized use of the database.

https://clickhouse.yandex/docs/en/security_changelog/

CVE-2018-14669 HIGH

ClickHouse MySQL client before versions 1.1.54390 had "LOAD DATA LOCAL INFILE" functionality enabled that allowed a malicious MySQL database read arbitrary files from the connected ClickHouse server.

https://clickhouse.yandex/docs/en/security_changelog/

CVE-2018-14672 MEDIUM

In ClickHouse before 18.12.13, functions for loading CatBoost models allowed path traversal and reading arbitrary files through error messages.

https://clickhouse.yandex/docs/en/security_changelog/

Install clickhouse

Run the following command to install Clickhouse:.
Require the Clickhouse gem. Setup the logging output. Establish the connection with the ClickHouse server (using the default config). List databases and tables. Check if table exists.