Czas trwania usuwania z podzapytaniem Opcje

[rakso83]

Mam mała zagadkę (przynajmniej dla mnei to jest zagadka:) ).

Mam dwie tabelki:

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mysql> mysql> SHOW TABLE STATUS;
+------+--------+---------+------------+--------+----------------+-------------+------------------+--------------+-----------+----------------+---------------------+---------------------+------------+-------------------+----------+----------------+-----------------------+
| Name | Engine | Version | Row_format | Rows   | Avg_row_length | Data_length | Max_data_length  | Index_length | Data_free | AUTO_INCREMENT | Create_time         | Update_time         | Check_time | Collation         | Checksum | Create_options | Comment               |
+------+--------+---------+------------+--------+----------------+-------------+------------------+--------------+-----------+----------------+---------------------+---------------------+------------+-------------------+----------+----------------+-----------------------+
| DATA | InnoDB |      10 | Compact    | 144563 |           8203 |  1185939456 |                0 |            0 |         0 |         144554 | 2009-03-19 14:45:48 | NULL                | NULL       | latin1_swedish_ci |     NULL |          | InnoDB free: 10240 kB |
| test | MyISAM |      10 | Fixed      |      1 |              9 |           9 | 2533274790395903 |         2048 |         0 |           NULL | 2009-03-19 15:46:18 | 2009-03-19 15:46:18 | NULL       | latin1_swedish_ci |     NULL |          |                       |
+------+--------+---------+------------+--------+----------------+-------------+------------------+--------------+-----------+----------------+---------------------+---------------------+------------+-------------------+----------+----------------+-----------------------+
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mysql> DESC DATA;
+-------+------------+------+-----+---------+----------------+
| FIELD | Type       | NULL | KEY | DEFAULT | Extra          |
+-------+------------+------+-----+---------+----------------+
| id    | bigint(20) | NO   | PRI | NULL    | AUTO_INCREMENT |
| DATA  | text       | NO   |     | NULL    |                |
+-------+------------+------+-----+---------+----------------+
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mysql> DESC test;
+-------+------------+------+-----+---------+-------+
| FIELD | Type       | NULL | KEY | DEFAULT | Extra |
+-------+------------+------+-----+---------+-------+
| id    | bigint(20) | NO   | PRI | 0       |       |
+-------+------------+------+-----+---------+-------+
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W tabelce test mam tylko jeden rekord:

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mysql> SELECT * FROM test;
+----+
| id |
+----+
| 50 |
+----+
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A teraz to o co mi chodzi (IMG:http://forum.php.pl/style_emoticons/default/smile.gif) Czyli dwa zapytania (DELETE):

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mysql> DELETE FROM DATA WHERE `id` IN (SELECT id FROM test); Query OK, 0 rows affected (22.50 sec)
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mysql> DELETE FROM DATA WHERE `id` IN (50);
Query OK, 0 rows affected (0.13 sec)
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Czemu zapytanie z podzapytaniem wykonuje się tak długo? Czy da się je przyśpieszyć? Docelowo wartości w tabelach będą dużo większe (data ok 500000 rekordów, a w test ok 100000).

Macie jakieś pomysły? Dzięki za pomoc!