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show variables like '%tmp%’;
получаю ответ - 2147483648
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show variables like '%tmp%’;
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tmp_table_size
Command-Line Format --tmp-table-size=#
System Variable tmp_table_size
Scope Global, Session
Dynamic Yes
SET_VAR Hint Applies Yes
Type Integer
Default Value 16777216
Minimum Value 1024
Maximum Value 18446744073709551615
The maximum size of internal in-memory temporary tables. This variable does not apply to user-created MEMORY tables.
The actual limit is the smaller of tmp_table_size and max_heap_table_size. When an in-memory temporary table exceeds the limit, MySQL automatically converts it to an on-disk temporary table.
Increase the value of tmp_table_size (and max_heap_table_size if necessary) if you do many advanced GROUP BY queries and you have lots of memory.
You can compare the number of internal on-disk temporary tables created to the total number of internal temporary tables created by comparing Created_tmp_disk_tables and Created_tmp_tables values.