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The MEMORY storage engine creates tables with contents that are stored in memory. Formerly, these were known as HEAP tables. MEMORY is the preferred term, although HEAP remains supported for backward compatibility.
Each MEMORY table is associated with one disk file. The filename begins with the table name and has an extension of .frm to indicate that it stores the table definition.
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mysql> create temporary table tmp1(id int not null);
Query OK, 0 rows affected (0.00 sec)
mysql> show create table tmp1;
+-------+----------------------------------------------------------------------------------------------+
| Table | Create Table                                                                               |
+-------+----------------------------------------------------------------------------------------------+
| tmp1   | CREATE TEMPORARY TABLE `tmp1` ( `id` int(11) NOT NULL) ENGINE=MyISAM DEFAULT CHARSET=utf8    |
+-------+----------------------------------------------------------------------------------------


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