I had a customer the other day ask how GREFs are measured and how the relationship of the host, storage, and DB engine all influence that number measured in hundreds of thousands or millions.  Is there any good documentation that explains this and/or assists with calculating a GREF count?

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Is it a good practice to set the MAXLEN value of %Library.String property type?  Will it lead to wasted storage if its not really using it?

For example, I have to store a 5 characters long string into the below str field. Which of the statement is recommended? 

Property str As %String;

vs

Property str As %String(MAXLEN="5");

 

 

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