Hi folks.
I have table:

mysql> describe gosc;
+-------------+---------------------+------+-----+---------------------+----
---+
| Field       | Type                | Null | Key | Default             |
Extra |
+-------------+---------------------+------+-----+---------------------+----
---+
| sesja       | varchar(32) binary  |      | PRI |                     |
|
| host        | varchar(80)         | YES  | MUL | NULL                |
|
| data_wej    | datetime            |      | MUL | 0000-00-00 00:00:00 |
|
| browser     | varchar(100)        | YES  |     | NULL                |
|
| last_action | datetime            |      | MUL | 0000-00-00 00:00:00 |
|
| id_pory1    | int(3) unsigned     | YES  |     | NULL                |
|
| id_pory2    | int(3) unsigned     | YES  |     | NULL                |
|
| nr_ip       | varchar(15)         | YES  |     | NULL                |
|
| id_user     | bigint(12) unsigned |      | MUL | 0                   |
|
| user_log    | varchar(150)        |      |     | 0-                  |
|
+-------------+---------------------+------+-----+---------------------+----
---+
10 rows in set (1.39 sec)


I made:

mysql> explain select sesja,data_wej,id_user,user_log,nr_ip from gosc where
date_add(last_action, interval 5 minute) > now();
+-------+------+---------------+------+---------+------+-------+------------
+
| table | type | possible_keys | key  | key_len | ref  | rows  | Extra
|
+-------+------+---------------+------+---------+------+-------+------------
+
| gosc  | ALL  | NULL          | NULL |    NULL | NULL | 37803 | where used
|
+-------+------+---------------+------+---------+------+-------+------------
+

Is my table good indexed ?? Or maybe this query above can be faster ??

Regards

Ireneusz Piasecki



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