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From: BirgittaHauser

(snipping a WHOLE bunch of really great information, because I need to read
it all in more detail)

From my testing, I know that new records will appear in a cursor as they
are added, so that's not an issue.

That's not always true. SQL tends to create temporary objects, that are
only actualized if an OPEN statement gets executed.

Interesting. I did a very simple test with just a declare and an open and
SQL picked up new records. Take the example below:

-------------
exec sql declare c cursor for
select alpha from data where alpha = 'a';
exec sql open c;
dsply ' ' result;
x = -1;
dou sqlcod <> 0;
x += 1;
exec sql fetch next from c into :myfld;
enddo;
exec sql close c;
dsply (%char(x) + ' records found.');
*Inlr = *on;
-------------

I started the program with one record in the file that matched the WHERE
clause. When the program stopped at the first DSPLY opcode, I then added a
second record that matched the WHERE clause. I then resumed the program and
it counted both records.


But it is possible to force the optimizer to use life data, by either
compiling a program with embedded SQL with the Option ALWCPY = *NO or
specifying a cursor as sensitive. SQL performance will be better if the
optimizer can use temporary objects.

In my example above I left all the defaults on the CRTSQLRPGI command, which
included ALWCPY(*OPTIMIZE). I suppose that maybe it worked fine in this
case because my selection was so simple, but had I done something a bit more
complex it might not have worked.

Joe


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