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Significance of Primary Keys
Posted by: Ira Holtzer
Date: September 24, 2010 07:04AM

Hi,

Our developers created a history solution to record activity for our site based on MyISAM. If it matters, there are many inserts and very few selects/updates being done on this DB.

The developers did not specify in any of the tables a primary key.

What would MyISAM do in this scenario?
Will it choose some PK for itself? If yes, how do I know which PK it chose?
How can this affect performance? What do I need to consider?
I saw a lot of material on how InnoDB stores the data, and a lot of comparisons saying that MyISAM is different in that respect, but couldn't find any good explanation as to how and what the implications are.

Ultimately my question is, whether I should request adding primary keys, and if yes, should I use surrogate or natural ones?

Cheers

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