Dear Sirs,
Given the following table
CREATE TABLE specifications (
objectId int not null default 0,
paramValue varchar(255) not null default '',
INDEX(objectId)
)
and the query
SELECT * FROM specifications WHERE objectId = x
Would the speed of the query be slower if the paramValue
field were changed to a TEXT field (instead of VARCHAR) ?
I believe that the speed of the query is only dependent
on the datatypes of the queried field (in the WHERE) clause,
is this not so ?
In case you're wondering, I have an object which stores
its attributes in 2 tables: the 'specifications ' table
above stores about 50 values which are all less than 255
characters each. Another table stores a longer 'description'
in a TEXT field.
So I have been wondering whether it might be quicker to
store all of the object's properties in one table (changing
the VARCHAR field to a TEXT) and therefore just make
one query.
Thank you very much in advance,
Heather
1  1347 
If the objectId is indexed as well as you just did, and the whare case of
your query only depend on objectId - which - fortunately is just what u
planning to do :-)
Go ahead change the type of the paramValue field, it will not slow anthing
down.
Cheers,
ccton
-- www.vicdir.com
"Heather Fraser" <he************ @gmail.com> ????
news:47******** *************** ***@posting.goo gle.com... Dear Sirs,
Given the following table
CREATE TABLE specifications (
objectId int not null default 0,
paramValue varchar(255) not null default '',
INDEX(objectId)
)
and the query
SELECT * FROM specifications WHERE objectId = x
Would the speed of the query be slower if the paramValue
field were changed to a TEXT field (instead of VARCHAR) ?
I believe that the speed of the query is only dependent
on the datatypes of the queried field (in the WHERE) clause,
is this not so ?
In case you're wondering, I have an object which stores
its attributes in 2 tables: the 'specifications ' table
above stores about 50 values which are all less than 255
characters each. Another table stores a longer 'description'
in a TEXT field.
So I have been wondering whether it might be quicker to
store all of the object's properties in one table (changing
the VARCHAR field to a TEXT) and therefore just make
one query.
Thank you very much in advance,
Heather This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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