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21 lines
594 B
SQL
21 lines
594 B
SQL
-- Tags: no-parallel
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-- Tag no-parallel: Messes with internal cache
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-- Start with empty query cache QC
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SYSTEM DROP QUERY CACHE;
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SELECT 1 SETTINGS use_query_cache = true;
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SELECT 1 SETTINGS use_query_cache = true;
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SYSTEM FLUSH LOGS;
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SELECT ProfileEvents['QueryCacheHits'], ProfileEvents['QueryCacheMisses']
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FROM system.query_log
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WHERE type = 'QueryFinish'
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AND current_database = currentDatabase()
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AND query = 'SELECT 1 SETTINGS use_query_cache = true;'
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ORDER BY event_time_microseconds;
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-- (The 1st execution was a cache miss, the 2nd execution was a cache hit)
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SYSTEM DROP QUERY CACHE;
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