|
|
Posted by Antoni on 03/28/07 05:52
Hello,
How do I add an index to id_count & ip? Will any data be lost?
Thanks!
Antoni
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.
Navigation:
[Reply to this message]
|