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Temporary Table in PL/SQL / Avoid duplicate key inserts

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8.6
I am trying to use a table to store the key of records I have inserted, and check that table for occurrences of the primary key to verify it does not exist before another is inserted.  The below code works, but uses a normal oracle table and is slow, so I thought some sort of virtual table would be better.  Can I query Associative arrays like they were tables?  Is that efficient?  Any alternate suggestions?  

DECLARE
   var_A number;   var_B number;   count_A number;
   
   CURSOR cur_C IS SELECT (...) FROM tab_X;
   
BEGIN

   EXECUTE IMMEDIATE 'CREATE TABLE tab_a (...)';

   OPEN cur_C;
   LOOP
         FETCH cur_C INTO var_A, var_B;
   
         SELECT count(A) INTO count_A FROM tab_X WHERE A = var_A;
   
         IF count_A = 0 THEN
               INSERT INTO tab_B (...)
           ELSE
               /* Log Dupes */
         END IF;
   
         EXIT WHEN cur_C%NOTFOUND;
   
   END LOOP;
   
   CLOSE cur_C;
   
   COMMIT;

    /* Build tab_A indexes here */
   
END;
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Expert Comment by jwahl:

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Accepted Solution by jwahl:

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