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ClickHouse® is a real-time analytics DBMS
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Python 8.8%
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Haavard Kvaalen e6711675a1 Make handling of unavailable MySQL consistent 
If MySQL was unavailable when loading an existing database on startup,
we would previously load the database, fail to start synchronization,
but allow queries to the database.  Change this to only allow queries
if the `allows_queries_when_mysql_lost` setting is on, so that the
behavior is consistent with what happens if the connection to MySQL is
lost while ClickHouse is running.

Also retry connection to MySQL if MySQL is unavailable when ClickHouse
is started (we would previously reconnect only if the connection was
lost during the initial dump of existing data).
2021-03-04 08:49:06 +01:00
.github Drop truthy.check-keys from yamllint (does not supported on CI) 2021-02-21 06:15:36 +03:00
base Merge pull request #20149 from keen-wolf/timezone_about 2021-02-28 21:53:51 +03:00
benchmark Convert to python3 (#15007) 2020-10-02 19:54:07 +03:00
cmake Fix ccache 4.2+ usage (RULE_LAUNCH_COMPILE/RULE_LAUNCH_LINK was not set) 2021-02-24 21:56:19 +03:00
contrib Merge branch 'master' of github.com:ClickHouse/ClickHouse into hedged-requests 2021-03-02 11:59:32 +03:00
debian Auto version update to [21.3.1.1] [54448] 2021-02-01 12:50:56 +03:00
docker Merge pull request #21381 from ClickHouse/aku/perf-negative 2021-03-03 15:55:14 +03:00
docs DOCSUP-4915: documented geo data types (#21294) 2021-03-01 19:41:16 +03:00
programs Merge pull request #21365 from azat/clickhouse-stop-kill-wait 2021-03-03 02:11:17 +03:00
src Make handling of unavailable MySQL consistent 2021-03-04 08:49:06 +01:00
tests Fix Arcadia 2021-03-03 18:12:39 +03:00
utils Update version_date.tsv after release 20.8.14.4 2021-03-03 16:53:26 +03:00
website Fix idiotic syntax highlight in docs #18432 2021-02-28 04:42:45 +03:00
.arcignore Added .arcignore 2020-05-21 09:17:03 +03:00
.clang-format Fixed wrong code around Memory Profiler 2020-03-03 03:24:44 +03:00
.clang-tidy Enable clang-tidy for programs and utils 2020-05-18 04:19:50 +03:00
.editorconfig Changed tabs to spaces in editor configs and in style guide [#CLICKHOUSE-3]. 2017-04-01 11:35:09 +03:00
.gitattributes Decreased warning threshold [#MOBMET-3248] 2016-06-07 11:23:15 +03:00
.gitignore ignore data store files 2021-02-17 12:58:17 +08:00
.gitmodules Merge branch 'master' into in_memory_raft 2021-02-01 14:30:11 +03:00
.potato.yml Fix yamllint issues 2021-02-20 23:25:21 +03:00
.pylintrc Add pylintrc config 2021-01-26 23:35:56 +03:00
.vimrc Changed tabs to spaces in editor configs and in style guide [#CLICKHOUSE-3]. 2017-04-01 11:35:09 +03:00
.yamllint Drop truthy.check-keys from yamllint (does not supported on CI) 2021-02-21 06:15:36 +03:00
AUTHORS Update AUTHORS 2020-01-23 17:36:05 +03:00
CHANGELOG.md Update CHANGELOG.md 2021-02-07 18:19:10 +03:00
CMakeLists.txt Merge branch 'master' into kssenii-pg2ch 2021-01-15 17:33:19 +03:00
CODE_OF_CONDUCT.md Add minimal code of conduct #9676 2020-03-16 12:44:28 +03:00
CONTRIBUTING.md Update CONTRIBUTING.md 2020-01-27 21:03:30 +03:00
docker-compose.yml Updated docker-compose.yml #1025 2017-07-26 20:05:32 +03:00
format_sources allow several <graphite> targets (#603) 2017-03-21 23:08:09 +04:00
LICENSE Update LICENSE 2021-01-25 17:00:13 +03:00
PreLoad.cmake Check if XCODE_IDE is true and avoid enforcing ninja in that case 2021-01-06 03:06:03 +04:00
README.md Update README.md 2021-02-13 01:46:13 +03:00
release Convert to python3 (#15007) 2020-10-02 19:54:07 +03:00
SECURITY.md Update SECURITY.md (outdated long time ago) 2021-01-21 16:48:28 +03:00
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ya.make Changes required for auto-sync with Arcadia 2020-04-16 15:31:57 +03:00

README.md

ClickHouse — open source distributed column-oriented DBMS

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

Useful Links

  • Official website has quick high-level overview of ClickHouse on main page.
  • Tutorial shows how to set up and query 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 to chat with ClickHouse users in real-time.
  • Blog contains various ClickHouse-related articles, as well as announcements and reports about events.
  • Code Browser with syntax highlight and navigation.
  • Contacts can help to get your questions answered if there are any.
  • You can also fill this form to meet Yandex ClickHouse team in person.