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Это старая версия документа!

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mysql> set @@tmp_table_size=327680000;
Query OK, 0 rows affected (0.00 sec)
 
mysql> show variables like '%tmp%';
+-------------------+-----------+
| Variable_name     | Value     |
+-------------------+-----------+
| max_tmp_tables    | 32        |
| slave_load_tmpdir | /tmp      |
| tmp_table_size    | 327680000 |
| tmpdir            | /tmp      |
+-------------------+-----------+
4 rows in set (0.00 sec)
 
mysql>