SQL performance problem.. here is explain plan

Question

This takes 12 seconds... and give 100 K rows in return..
I need to do pagination and start and end index should be any rang like 200 TO 300
So when I get that it never comes back..
select rownum rn , X.*
   from  v_online_item X,             
   (SELECT c.category_seq AS seq_no, c.assoc_seq, c.assoc_table_name             
          FROM v_online_category_assoc c,
               (SELECT     assoc_seq
                      FROM v_online_category_assoc a
                     WHERE a.assoc_table_name = 'V_ONLINE_CATEGORY'               
                CONNECT BY category_seq = PRIOR assoc_seq
                       AND assoc_table_name = 'V_ONLINE_CATEGORY'
                START WITH category_seq = 170101
                       AND assoc_table_name = 'V_ONLINE_CATEGORY'
               UNION
               SELECT to_number(170101)
                 FROM DUAL
                  ) v
         WHERE c.category_seq = v.assoc_seq
           AND assoc_table_name = 'V_ONLINE_ITEM'
   ) Y
   where X.item_seq = Y.assoc_seq 
Plan
SELECT STATEMENT  ALL_ROWSCost: 1,484,076  Bytes: 76,566,065,969  Cardinality: 4,868,447                                                              
     17 FILTER                                                         
          16 VIEW VZW_ADMIN. Cost: 1,484,076  Bytes: 76,566,065,969  Cardinality: 4,868,447                                                    
               15 COUNT                                               
                    14 HASH JOIN  Cost: 1,484,076  Bytes: 5,588,977,156  Cardinality: 4,868,447                                          
                         12 NESTED LOOPS  Cost: 31,929  Bytes: 189,869,433  Cardinality: 4,868,447                                     
                              10 VIEW VZW_ADMIN. Cost: 8  Bytes: 416  Cardinality: 32                                
                                   9 SORT UNIQUE  Cost: 8  Bytes: 806  Cardinality: 32                           
                                        8 UNION-ALL                      
                                             6 FILTER                 
                                                  5 CONNECT BY WITH FILTERING            
                                                       1 INDEX RANGE SCAN INDEX (UNIQUE) VZW_ADMIN.UDX1_ONLINE_CATEGORY_ASSOC Cost: 4  Bytes: 735  Cardinality: 15       
                                                       4 NESTED LOOPS       
                                                            2 CONNECT BY PUMP 
                                                            3 INDEX RANGE SCAN INDEX (UNIQUE) VZW_ADMIN.UDX1_ONLINE_CATEGORY_ASSOC Cost: 4  Bytes: 806  Cardinality: 31 
                                             7 FAST DUAL  Cost: 2  Cardinality: 1                 
                              11 INDEX RANGE SCAN INDEX (UNIQUE) VZW_ADMIN.UDX1_ONLINE_CATEGORY_ASSOC Cost: 998  Bytes: 3,955,614  Cardinality: 152,139                                
                         13 TABLE ACCESS FULL TABLE VZW_ADMIN.V_ONLINE_ITEM Cost: 670,275  Bytes: 16,092,289,779  Cardinality: 14,510,631                                     
select * from
         (select rownum rn , X.*
   from  v_online_item X,             
   (SELECT c.category_seq AS seq_no, c.assoc_seq, c.assoc_table_name             
          FROM v_online_category_assoc c,
               (SELECT     assoc_seq
                      FROM v_online_category_assoc a
                     WHERE a.assoc_table_name = 'V_ONLINE_CATEGORY'               
                CONNECT BY category_seq = PRIOR assoc_seq
                       AND assoc_table_name = 'V_ONLINE_CATEGORY'
                START WITH category_seq = 170101
                       AND assoc_table_name = 'V_ONLINE_CATEGORY'
               UNION
               SELECT to_number(170101)
                 FROM DUAL
                  ) v
         WHERE c.category_seq = v.assoc_seq
           AND assoc_table_name = 'V_ONLINE_ITEM'
   ) Y
   where X.item_seq = Y.assoc_seq 
    where  rn between :s_index and :e_index    ;
Plan
SELECT STATEMENT  ALL_ROWSCost: 1,484,076  Bytes: 76,566,065,969  Cardinality: 4,868,447                                                              
     17 FILTER                                                         
          16 VIEW VZW_ADMIN. Cost: 1,484,076  Bytes: 76,566,065,969  Cardinality: 4,868,447                                                    
               15 COUNT                                               
                    14 HASH JOIN  Cost: 1,484,076  Bytes: 5,588,977,156  Cardinality: 4,868,447                                          
                         12 NESTED LOOPS  Cost: 31,929  Bytes: 189,869,433  Cardinality: 4,868,447                                     
                              10 VIEW VZW_ADMIN. Cost: 8  Bytes: 416  Cardinality: 32                                
                                   9 SORT UNIQUE  Cost: 8  Bytes: 806  Cardinality: 32                           
                                        8 UNION-ALL                      
                                             6 FILTER                 
                                                  5 CONNECT BY WITH FILTERING            
                                                       1 INDEX RANGE SCAN INDEX (UNIQUE) VZW_ADMIN.UDX1_ONLINE_CATEGORY_ASSOC Cost: 4  Bytes: 735  Cardinality: 15       
                                                       4 NESTED LOOPS       
                                                            2 CONNECT BY PUMP 
                                                            3 INDEX RANGE SCAN INDEX (UNIQUE) VZW_ADMIN.UDX1_ONLINE_CATEGORY_ASSOC Cost: 4  Bytes: 806  Cardinality: 31 
                                             7 FAST DUAL  Cost: 2  Cardinality: 1                 
                              11 INDEX RANGE SCAN INDEX (UNIQUE) VZW_ADMIN.UDX1_ONLINE_CATEGORY_ASSOC Cost: 998  Bytes: 3,955,614  Cardinality: 152,139                                
                         13 TABLE ACCESS FULL TABLE VZW_ADMIN.V_ONLINE_ITEM Cost: 670,275  Bytes: 16,092,289,779  Cardinality: 14,510,631                                     

Answer 1

user550024 wrote:
This takes 12 seconds... and give 100 K rows in return..
I need to do pagination and start and end index should be any rang like 200 TO 300
So when I get that it never comes back..Refer to the Tom Kyte column mentioned, but just a few comments: Your query seems to be missing an explicit ORDER BY, so it's unsure what order you're actually thinking of when performing your pagination.
Second, using "rn between :s_index and :e_index" doesn't activate the FIRST_ROWS_n mode of the optimizer. You should use either an explicit FIRST_ROWS(n) hint, or even better, use the more convoluted double-inline view syntax as shown by Tom (... where rownum <= :M ... where rnum >= :N).
If you don't have a supporting index for the ORDER requested, you should see at least a SORT ORDER BY STOPKEY operation. At least one of the columns of the index needs to be defined as NOT NULL to be supported by a normal b*tree index. If you have character-based columns in the ORDER BY/index definition you need to make sure that you're using NLS_SORT = binary on the clients involved, otherwise again a normal b*tree index can't be used for returning the result set in the order requested.
Regards,
Randolf
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