Hi DBAs
Here are 2 scenario's. Which one is more efficient?
Assume 10,000 records to update
Thanks
Rick
1. For each record update field1 with subsquery
Assume cursor is declared
FOR cursor_rec IN new_patients_cur LOOP
UPDATE <table>
SET field1 =
(SELECT value
FROM table
WHERE ...)
WHERE ....
END LOOP;
2. For each record load nested table with data then update all records with
a single FORALL
t_type1 IS TABLE OF table1.field1%TYPE;
v_type1 t_type1(10000);
/* Load the PLSQL nested table */
FOR cursor_rec IN new_patients_cur LOOP
v_loop_ctr := v_loop_ctr + 1;
v_type1 := cursor_rec.field1;
END LOOP;
/* INSERT all 10,000 records with on context switch */
FORALL v_count IN 1...10000)
UPDATE field1 = v_type1(v_count);
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