ClickHouse/tests/performance/mmap_io.xml

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<test>
<settings>
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<local_filesystem_read_method>mmap</local_filesystem_read_method>
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<min_bytes_to_use_mmap_io>1</min_bytes_to_use_mmap_io>
</settings>
<create_query>CREATE TABLE hits_none (WatchID UInt64 CODEC(NONE)) ENGINE = MergeTree ORDER BY tuple()</create_query>
<fill_query>INSERT INTO hits_none SELECT WatchID FROM test.hits</fill_query>
<fill_query>OPTIMIZE TABLE hits_none FINAL</fill_query>
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<query short="1"><![CDATA[SELECT sum(WatchID) FROM hits_none]]></query>
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<drop_query>DROP TABLE hits_none</drop_query>
</test>