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ClickHouse® is a real-time analytics DBMS
a75559aa36
From the log:
2022.04.29 12:33:40.397528 [ 486 ] {} <Debug> SystemLog (system.asynchronous_metric_log): Existing table system.asynchronous_metric_log for system log has obsolete or different structure. Renaming it to asynchronous_metric_log_352.
Old: CREATE TABLE system.asynchronous_metric_log (`event_date` Date CODEC(Delta(2), ZSTD(1)), `event_time` DateTime CODEC(Delta(4), ZSTD(1)), `metric` LowCardinality(String) CODEC(ZSTD(1)), `value` Float64 CODEC(Gorilla, ZSTD(3))) ENGINE = MergeTree PARTITION BY toYYYYMM(event_date) ORDER BY (metric, event_date, event_time) SETTINGS index_granularity = 8192
New: CREATE TABLE system.asynchronous_metric_log (`event_date` Date CODEC(Delta(2), ZSTD), `event_time` DateTime CODEC(Delta(4), ZSTD), `metric` LowCardinality(String) CODEC(ZSTD), `value` Float64 CODEC(Gorilla, ZSTD(3))) ENGINE = MergeTree PARTITION BY toYYYYMM(event_date) ORDER BY (metric, event_date, event_time) SETTINGS index_granularity = 8192
As you can see the difference in default ZSTD level.
P.S. I decided not to fix the printer, since this may introduce changes
in metadata, that may lead to changes in metadata between ZooKeeper and
clickhouse server.
Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
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| CODE_OF_CONDUCT.md | ||
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| PreLoad.cmake | ||
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| SECURITY.md | ||
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 (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.