Help with Oracle text using CTX_DOC.SNIPPET

Question

I used to find the code as follows:
     SELECT ROWIDS,ID,NGAYTAO,NGAYXUATBAN,CHUYENMUC,FULLPATH,NGONNGU,NOIDUNG,TIEUDE
                                   ,(SELECT CTX_DOC.SNIPPET('SEARCH_DNICT_MOTA_IDX',ROWIDS,:tukhoa) FROM DUAL) || '..' ||
                                    (SELECT CTX_DOC.SNIPPET('SEARCH_DNICT_NOIDUNG_IDX',ROWIDS,:tukhoa) FROM DUAL) || '..' ||
                                    (SELECT CTX_DOC.SNIPPET('SEARCH_DNICT_TTHC1_IDX',ROWIDS,:tukhoa) FROM DUAL) || '..' ||
                                    (SELECT CTX_DOC.SNIPPET('SEARCH_DNICT_TTHC2_IDX',ROWIDS,:tukhoa) FROM DUAL) || '..' ||
                                    (SELECT CTX_DOC.SNIPPET('SEARCH_DNICT_TTHC3_IDX',ROWIDS,:tukhoa) FROM DUAL) || '..' ||
                                    (SELECT CTX_DOC.SNIPPET('SEARCH_DNICT_TTHC4_IDX',ROWIDS,:tukhoa) FROM DUAL) || '..' MOTA
                                    FROM SEARCH_DNICT
                                    WHERE (CONTAINS(SEARCH_DNICT.TIEUDE,:tukhoa,1)>0
                                    OR CONTAINS(SEARCH_DNICT.MOTA,:tukhoa,2)>0
                                    OR CONTAINS(SEARCH_DNICT.NOIDUNG,:tukhoa,3)>0
                                    OR CONTAINS(SEARCH_DNICT.TTHC1,:tukhoa,4)>0
                                    OR CONTAINS(SEARCH_DNICT.TTHC2,:tukhoa,5)>0
                                    OR CONTAINS(SEARCH_DNICT.TTHC3,:tukhoa,6)>0
                                    OR CONTAINS(SEARCH_DNICT.TTHC4,:tukhoa,7)>0)- when I following query return 50 documents it takes 10.969 seconds load just for one use. Now my database is not only very little data
- I find if such search is too slow, I have studied but have not found a way to accelerate your returns faster results like?
- I want to improve performance query is how?
- I hope people will help me solve
Thanks every body!

Answer 1

Hi,
what is the plan for this query? I think it is maybe a full scan on the table and it uses not even the indexes. Is it possible to rewrite the query to use union?
SELECT ROWIDS,ID,NGAYTAO,NGAYXUATBAN,CHUYENMUC,FULLPATH,NGONNGU,NOIDUNG,TIEUDE ,
(SELECT CTX_DOC.SNIPPET('SEARCH_DNICT_MOTA_IDX',ROWIDS,:tukhoa) FROM DUAL) || '..' ||
(SELECT CTX_DOC.SNIPPET('SEARCH_DNICT_NOIDUNG_IDX',ROWIDS,:tukhoa) FROM DUAL) || '..' ||
(SELECT CTX_DOC.SNIPPET('SEARCH_DNICT_TTHC1_IDX',ROWIDS,:tukhoa) FROM DUAL) || '..' ||
(SELECT CTX_DOC.SNIPPET('SEARCH_DNICT_TTHC2_IDX',ROWIDS,:tukhoa) FROM DUAL) || '..' ||
(SELECT CTX_DOC.SNIPPET('SEARCH_DNICT_TTHC3_IDX',ROWIDS,:tukhoa) FROM DUAL) || '..' ||
(SELECT CTX_DOC.SNIPPET('SEARCH_DNICT_TTHC4_IDX',ROWIDS,:tukhoa) FROM DUAL) || '..' MOTA
FROM
  SELECT ROWIDS,ID,NGAYTAO,NGAYXUATBAN,CHUYENMUC,FULLPATH,NGONNGU,NOIDUNG,TIEUDE
  FROM SEARCH_DNICT
  WHERE CONTAINS(SEARCH_DNICT.TIEUDE,:tukhoa,1)>0
  UNION
  SELECT ROWIDS,ID,NGAYTAO,NGAYXUATBAN,CHUYENMUC,FULLPATH,NGONNGU,NOIDUNG,TIEUDE
  FROM SEARCH_DNICT
  WHERE CONTAINS(SEARCH_DNICT.MOTA,:tukhoa,2)>0
  UNION
  SELECT ROWIDS,ID,NGAYTAO,NGAYXUATBAN,CHUYENMUC,FULLPATH,NGONNGU,NOIDUNG,TIEUDE
  FROM SEARCH_DNICT
  WHERE CONTAINS(SEARCH_DNICT.NOIDUNG,:tukhoa,3)>0
  UNION
  SELECT ROWIDS,ID,NGAYTAO,NGAYXUATBAN,CHUYENMUC,FULLPATH,NGONNGU,NOIDUNG,TIEUDE
  FROM SEARCH_DNICT
  WHERE CONTAINS(SEARCH_DNICT.TTHC1,:tukhoa,4)>0
  UNION
  SELECT ROWIDS,ID,NGAYTAO,NGAYXUATBAN,CHUYENMUC,FULLPATH,NGONNGU,NOIDUNG,TIEUDE
  FROM SEARCH_DNICT
  WHERE CONTAINS(SEARCH_DNICT.TTHC2,:tukhoa,5)>0
  UNION
  SELECT ROWIDS,ID,NGAYTAO,NGAYXUATBAN,CHUYENMUC,FULLPATH,NGONNGU,NOIDUNG,TIEUDE
  FROM SEARCH_DNICT
  WHERE CONTAINS(SEARCH_DNICT.TTHC3,:tukhoa,6)>0
  UNION
  SELECT ROWIDS,ID,NGAYTAO,NGAYXUATBAN,CHUYENMUC,FULLPATH,NGONNGU,NOIDUNG,TIEUDE
  FROM SEARCH_DNICT
  WHERE CONTAINS(SEARCH_DNICT.TTHC4,:tukhoa,7)>0
) If above doesn't help, then maybe a combined index on the fields will help. Examples are given in this forum if you search for multi colum index.
Herald ten Dam
http://htendam.wordpress.com