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ClickHouse® is a real-time analytics DBMS
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Azat Khuzhin df67af0c88 Fix disabling query profiler 
Before there was two incorrect checks:
- timer_id != nullptr, but first timer is 0x0 and the comparison does
  not work
- previous_handler should also be reseted regardless it was nullptr or
  not, plus it also incorrectly uses 'sigaction * previous_handler'
  before.

Which leads to permanent query profiler enabled for particular thread,
this is especially visible if you have query profiler disabled and you
are running some query with profiler enabled, i.e.:

  select 1 settings query_profiler_real_time_period_ns=1

After, QueryPipelineEx will eat lots of CPU due because of profiler.
2021-11-24 23:28:20 +03:00
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debian Auto version update to [21.12.1.1] [54457] 2021-11-02 00:56:45 +03:00
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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 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 with syntax highlight and navigation.
  • Contacts can help to get your questions answered if there are any.