Bind concepts in DB2 cobol
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Answer Posted / suresh ramaiyan
As Sharath requested...
As we all know, all our programming(high level language) needs to be converted(compiled) into system-understandable(low level language) to be executed.
So, SQL statements in the COBOL programs needs to be compiled, such process is called BIND. DB2 Bind compiles all your sql statements(dbrm) into an executable format.
BIND also verifies all the information in the program with DB2 databases..
Here are the list of items happening through out BIND process (as of I know :) )
1. Syntax check of SQL query
2. Availability of Tables & columns in the database
3. It uses DB2 Optimizer to create the better access path. A clear way to read/update/delete table. like.. what are the columns are reading, which indexes needs to be used, the table space..etc.
So after BIND process finished, the Package/Plan contains exactly how to do, what we meant to do in system understandable language.
Hope it helps.. My apologies, if I confused or missed something.
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SET is the ANSI standard for variable assignment, SELECT is not. SET can only assign one variable at a time, SELECT can make multiple assignments at once. If assigning from a query, SET can only assign a scalar value. If the query returns multiple values/rows then SET will raise an error. SELECT will assign one of the values to the variable and hide the fact that multiple values were returned (so you'd likely never know why something was going wrong elsewhere - have fun troubleshooting that one) When assigning from a query if there is no value returned then SET will assign NULL, where SELECT will not make the assignment at all (so the variable will not be changed from it's previous value) As far as speed differences - there are no direct differences between SET and SELECT. However SELECT's ability to make multiple assignments in one shot does give it a slight speed advantage over SET.
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