ClickHouse/tests/performance/parallel_insert.xml

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<test>
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<create_query>
CREATE TABLE hits2 ENGINE MergeTree
PARTITION BY toYYYYMM(EventDate)
ORDER BY (CounterID, EventDate, intHash32(UserID))
SAMPLE BY intHash32(UserID)
SETTINGS
parts_to_delay_insert = 5000,
parts_to_throw_insert = 5000
AS
-- don't select all columns to keep the run time down
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SELECT CounterID, EventDate, UserID, Title
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FROM hits_10m_single
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-- do not select anything because we only need column types
LIMIT 0
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</create_query>
<fill_query>SYSTEM STOP MERGES</fill_query>
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<query>
INSERT INTO hits2
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SELECT CounterID, EventDate, UserID, Title
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FROM hits_10m_single
SETTINGS max_insert_threads=8
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</query>
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<drop_query>SYSTEM START MERGES</drop_query>
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<drop_query>DROP TABLE IF EXISTS hits2</drop_query>
</test>