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ClickHouse® is a real-time analytics DBMS
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Azat Khuzhin e373862c83 Do not use more then 98K of memory for uniqCombined* 
uniqCombined() uses hashtable for medium cardinality, and since
HashTable resize by the power of 2 (well actually HashTableGrower grows
double by the power of 2, hence HashTableGrower::increaseSize() should
be overwritten to change this), with 1<<13 (default for uniqCombined)
and UInt64 HashValueType, the HashTable will takes:

  getBufferSizeInBytes() == 131072

While it should be not greater then sizeof(HLL) ~= 98K, so reduce the
maximum cardinality for hashtable to 1<<12 with UInt64 HashValueType and
to 1<13 with UInt32, overwrite HashTableGrower::increaseSize() and cover
this using max_memory_usage.

Refs: https://github.com/ClickHouse/ClickHouse/pull/7221#issuecomment-539672742

v2: cover uniqCombined() with non-default K
2019-10-09 02:39:23 +03:00
.github Update PULL_REQUEST_TEMPLATE.md 2019-10-04 18:07:50 +03:00
cmake Build fixes (#7063) 2019-10-05 22:25:31 +03:00
contrib Build fixes (#7063) 2019-10-05 22:25:31 +03:00
dbms Do not use more then 98K of memory for uniqCombined* 2019-10-09 02:39:23 +03:00
debian Build fixes (#7063) 2019-10-05 22:25:31 +03:00
docker Merge branch 'master' into merging_values_with_expressions 2019-10-02 20:51:44 +03:00
docs [docs] fix some title case 2019-10-07 20:00:21 +03:00
libs Build fixes (#7063) 2019-10-05 22:25:31 +03:00
utils Build fixes (#7063) 2019-10-05 22:25:31 +03:00
website CLICKHOUSE-4669: some product placement (#7148) 2019-09-30 11:47:01 +03:00
.clang-format Fix style 2018-12-10 18:50:58 +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 delete BlockInputStreamFromRowInputStream 2019-08-27 21:29:56 +03:00
.gitlab-ci.yml fix ci 2018-02-06 13:13:44 +03:00
.gitmodules Replace libsparsehash with sparsehash-c11 2019-09-18 00:08:20 +03:00
.vimrc Changed tabs to spaces in editor configs and in style guide [#CLICKHOUSE-3]. 2017-04-01 11:35:09 +03:00
AUTHORS CLICKHOUSE-2720: progress on website and reference (#886) 2017-06-20 17:19:03 +03:00
CHANGELOG.md Update CHANGELOG.md 2019-10-05 04:08:13 +03:00
CMakeLists.txt Build fixes (#7063) 2019-10-05 22:25:31 +03:00
CONTRIBUTING.md Temporary fix for #2558 2018-06-26 16:14:32 +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 Duplicate copyright 2019-07-04 15:03:43 +03:00
PreLoad.cmake Disable ninja for CLion 2019-09-11 10:23:20 +03:00
README.md Remove link to (almost) past Meetup 2019-10-03 19:36:58 +02:00
release Initial fuzzing support with libfuzzer 2019-09-22 13:34:09 +03:00
SECURITY.md Changed repository URL 2019-09-23 19:18:19 +03:00
uncrustify.cfg Better .clang-format and uncrustify.cfg 2018-11-29 15:45:34 +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.
  • Blog contains various ClickHouse-related articles, as well as announces and reports about events.
  • 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.

Upcoming Events