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31 lines
865 B
MySQL
31 lines
865 B
MySQL
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-- Tags: no-parallel
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-- Tag no-parallel: Messes with internal cache
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-- Start with empty query cache QC and query log
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SYSTEM DROP QUERY CACHE;
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DROP TABLE system.query_log SYNC;
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-- Run a query with QC on. The first execution is a QC miss.
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SELECT '---';
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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 query = 'SELECT 1 SETTINGS use_query_cache = true;';
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-- Run previous query again with query cache on
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SELECT '---';
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SELECT 1 SETTINGS use_query_cache = true;
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DROP TABLE system.query_log SYNC;
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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 query = 'SELECT 1 SETTINGS use_query_cache = true;';
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SYSTEM DROP QUERY CACHE;
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