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Comments - MySQL: Number of on-disk temporary tables created per second is high (over 10 for 5m)

10 months ago Daniel Black
Re: MySQL: Number of on-disk temporary tables created per second is high (over 10 for 5m)

Per aria_used_for_temp_tables the MEMORY STORAGE engine is used for temporary tables.

One of its restrictions is that it cannot support text/blob types (MDEV-19), and because of this, JOINs create with these tables will go to disk.

Using log_slow_filter=tmp_table_on_disk, long_query_time=0 and an enabled slow query log will identify which query is related.

 
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