Question

This might be a silly question but i just want to make this clear. Does it take longer to preform a SQL query if each row has a large amount of data inside of it?

For instance if i’ve like 2000 bytes worth of data stored as an blob (we call the colum “Data”) in a row of a table containing 10 000 rows as a total (all of them similar with the blob size of “Data”) . Will it then take longer to process of an search if i only search for the ID for one row e.g does the server have to like process the whole information stored in each colum of every row it passes by?

Answer 1

In general if your ID column is the primary key on the table (or at least has an index) then a simple query like

SELECT ID,Data FROM Table WHERE ID = 1

will be just as fast no matter the size of the Data column