Maybe someone could provide a good resonable
input on this issue.
Let's say i have a table products
CASE 1:
table: products
id int unsigned not null,
name char(128) not null,
f_new tinyint not null
id - is basically the id of a product
name - is the name of a product
f_new - is a one byte flag. If it is 1 the product is condireed new.
In this case to select all new products including name i need to do:
select id, name from products wher f_new=1
CASE 2:
The above can be done another way - via two table,
one products table and another one - listing all ids
for new products
create table products (
id int unsigned not null,
name char(128) not null,
primay key (id)
);
create table newproducts (
product_id int unsigned not null,
primay key (id)
);
If product is is in newproducts table that it is
a new product.
To choose all new products including name i need to do:
SELECT id,name
FROM newproducts
INNER JOIN products ON products.id=newproducts.product_id
The questions are:
1) which way is FASTER?
2) which way eats less memory?
3) which way eats less cpu?
4) which way eats less hdd io?
There are several cases for each question:
1) <1000 products - i think both methods are pretty much the same
in this case because all of the data woul be cached in memory
2) 100000 products, 30000 new products - interesting to know
which method is better here and how each of the method performs.
3) 100000 products, 50 new products - interesting to know
which method is better here and how each of the method performs.
I will greately appriciate input on this issue.
--
Artem
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