How to check small table scan full table scan if we will use index in where clause.

How to check small table scan full table scan if i will use index column in where clause.
Is there example link there i can test small table scan full table if index is used in where clause.

Use explain plan on your statement or set autotrace traceonly in your SQL*Plus session followed by the SQL you are testing.
For example
SQL> set autotrace traceonly
SQL> select *
2 from XXX
3 where id='fga';
no rows selected
Execution Plan
   0      SELECT STATEMENT Optimizer=ALL_ROWS (Cost=13 Card=1 Bytes=16
          5)
   1    0   PARTITION RANGE (ALL) (Cost=13 Card=1 Bytes=165)
   2    1     TABLE ACCESS (FULL) OF 'XXX' (TABLE) (Cost=13 Card
          =1 Bytes=165)
Statistics
          1 recursive calls
          0 db block gets
       1561 consistent gets
        540 physical reads
          0 redo size
       1864 bytes sent via SQL*Net to client
        333 bytes received via SQL*Net from client
          1 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
          0 rows processed

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How to check with table for cursor..?
Here I have Table temp_final_plan
Here i want to update if already exit...below is the procedure....
CREATE OR REPLACE PROCEDURE spu_final_profit_plan
AS
-- Constant declarations
ln_errnum number := 0;
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   ls_errmsg app_errors.err_msg%TYPE;
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CURSOR cur_final_update IS
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             sum_avg_ytd_01 = rec_final_update_el.sum_avg_ytd_01,
             sum_avg_ytd_02 = rec_final_update_el.sum_avg_ytd_02,
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END spu_final_profit_plan;
[\pre]

I'm not sure what you mean by, 'How to check with table for cursor..?' but I'll offer a comment on your Code Snippet. I think you want to know how to check if a record exists so you know if you need to perform an INSERT or an UPDATE.
Here is a snippet of your code. I'll put my comments in "Comment" style in your code.
-- Insert / Update final profit plan for final_update query using cursor
   FOR rec_final_update_el IN cur_final_update_el
   LOOP
/* There is no need to test for %NOTFOUND since you are using Cursor FOR Loop!
** This construct automatically exits when the last record is processed. */
   EXIT WHEN rec_final_update_el%NOTFOUND;
/* Is this where you would like to know how to Check if the record already exist??
** I asked this because, 'rec_final_update_el.' is not valid syntax. Are you looking for
** an Cursor Attribute or Method you can check here?
** I would suggest a Primary Key or Unique Index on ENT, CENTER, and POST_ACCT
** on the TEMP_FINAL_PLAN table. Then simply perform an INSERT and code an
** Exception to UPDATE when you get a DUP_VAL_ON_INDEX exception. Otherwise,
** you will need to simply run an Implicit or Explicit Cursor to test if the row exists and
** use this return value to determine if you should INSERT or UPDATE. */
   IF rec_final_update_el. THEN
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             sum_avg_mtd_02 = rec_final_update_el.sum_avg_mtd_02,
             sum_avg_ytd_01 = rec_final_update_el.sum_avg_ytd_01,
             sum_avg_ytd_02 = rec_final_update_el.sum_avg_ytd_02,
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   END IF;
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