Question

i have the sql below that returns 35k rows and take about 10 mins to run. both tables have millions of row. how can i improve this sql?

SELECT /*+ index(T_DIRECTORY X_DIR) */ 
                 DIRx.dir_id ,                   
                 base.id       
                 FROM T_DIRECTORY DIRx,  T_PERSON base 
                 WHERE 
                   DIRx.id = 26463
                   and DIRx.PERSONID=  base.PERSONID

'| Id  | Operation                    | Name           |'
'-------------------------------------------------------'
'|   0 | SELECT STATEMENT             |                |'
'|   1 |  NESTED LOOPS                |                |'
'|   2 |   TABLE ACCESS BY INDEX ROWID| T_DIRECTORY |'
'|   3 |    INDEX RANGE SCAN          | X_DIRECTORY |'
'|   4 |   TABLE ACCESS BY INDEX ROWID| T_PERSON      |'
'|   5 |    INDEX UNIQUE SCAN         | I_PERSON      |'

Answer 1

i had to denormalize the table.