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Posted by Paul Lautman on 03/28/07 21:22
> Captain Paralytic ha escrit:
>> On 27 Mar, 16:18, "Antoni" <antonimassom...@gmail.com> wrote:
>>> Hello,
>>>
>>> I have a table with more than 1,000,000 rows.
>>>
>>> mysql> describe views_date;
>>> +----------+-------------+------+-----+---------+----------------+
>>>> Field | Type | Null | Key | Default | Extra |
>>> +----------+-------------+------+-----+---------+----------------+
>>>> id | bigint(20) | NO | PRI | NULL | auto_increment |
>>>> id_count | bigint(20) | YES | | NULL | |
>>>> date | datetime | YES | | NULL | |
>>>> type | int(3) | YES | | NULL | |
>>>> ip | varchar(15) | YES | | NULL | |
>>>> user | bigint(20) | YES | | NULL | |
>>> +----------+-------------+------+-----+---------+----------------+
>>> 6 rows in set (0.00 sec)
>>>
>>> This table is used to log info on which video the visitor has viewed
>>> and its IP address.
>>>
>>> Everytime a visitor views a video a new row is inserted.
>>>
>>> Then I use the following query to know if the visitor has already
>>> viewed the video:
>>>
>>> mysql> SELECT count(*) from views_date WHERE id_count = $videoid AND
>>> ip = '$ip';
>>> +----------+
>>>> count(*) |
>>> +----------+
>>>> 1 |
>>> +----------+
>>> 1 row in set (6.19 sec)
>>>
>>> mysql> explain SELECT count(*) from views_date WHERE id_count = 8731
>>> AND ip = '121.97.245.124';
>>> +----+-------------+------------+------+---------------+------
>>> +---------+------+---------+-------------+
>>>> id | select_type | table | type | possible_keys | key |
>>> key_len | ref | rows | Extra |
>>> +----+-------------+------------+------+---------------+------
>>> +---------+------+---------+-------------+
>>>> 1 | SIMPLE | views_date | ALL | NULL | NULL |
>>> NULL | NULL | 1089103 | Using where |
>>> +----+-------------+------------+------+---------------+------
>>> +---------+------+---------+-------------+
>>> 1 row in set (0.04 sec)
>>>
>>> Can anyone give me tips on how to optimize the table to run faster
>>> queries?
>>>
>>> Thanks!
>>>
>>> Antoni
>>
>> Why do you need the count? If they have viewed the video then a row
>> will be found so just:
>>
>> SELECT id from views_date WHERE id_count = $videoid AND ip = '$ip'
>> LIMIT 1;
>>
>> If it returns anything then they have viewed it. (Dunno why the video
>> id column should be named id_count, most strange)
>>
>> Add an INDEX on id_count, ip and you're laughing.
Antoni wrote:
> Hello,
>
> How do I add an index to id_count & ip? Will any data be lost?
>
> Thanks!
>
> Antoni
>
Please do not top post.
Look at the ALTER TABLE syntax. No data is lost you are ADDING an index, not
taking anything away
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