Report Using PL/SQL Region

Question

Hi,
I have bit experiment create custom reports using PL/SQL region
http://dbswh.webhop.net/apex/f?p=BLOG:READ:0::::ARTICLE:97800346956448
I would like have from you tips and ideas how enhance this.
Because I'm not so good with SQL,
I really appreciate if you have tips enhance performance for query used for cursor.
    /* Report query */
    l_sql := '
      SELECT * FROM(
        SELECT a.*, row_number() OVER (ORDER BY '
        || l_sort_col
        || ' '
        || l_sort_ord
        || ') rn, COUNT(1) over() mrn
        FROM(' || l_sql || ') a
      ) WHERE rn BETWEEN ' || l_start_row || ' AND ' || l_last_row
    ; Regards,
Jari

Answer 1

Hi Jari
I'm guessing you're trying to do paginated grid data or somewthing similar? You could try something like this...
    l_sql := 'SELECT * '||
           'FROM ('||
                  'SELECT /*+ FIRST_ROWS(n) */ '||
                          'a.*, ROWNUM rnum '||
                   'FROM ('||l_sql||' '||
                          'ORDER BY '||l_sort||' '||l_dir||') a '||
                   'WHERE ROWNUM <= '||l_max_row||') '||
           'WHERE rnum >= '||l_start;The variables would be initialized in the procedure as follows...
    l_max_row := p_start + p_limit;
    l_start   := p_start + 1;
    l_sort    := NVL(p_sort,'1');
    l_dir     := NVL(p_dir, 'ASC');My application process would be called something like follows, to spit out a JSON object...
BEGIN
  htp.p(wwv_flow.g_widget_num_return||'(');
  munky_extjs.grid_json(p_app_id => wwv_flow.g_x01,
                    p_app_page_id => wwv_flow.g_x02,
                    p_region_id => TO_NUMBER(wwv_flow.g_x03),
                    p_start => NVL(wwv_flow.g_x04,0),
                    p_limit => NVL(wwv_flow.g_x05,10),
                    p_sort => wwv_flow.g_x06,
                    p_dir => wwv_flow.g_x07);
  htp.p(')');
END;I think your use of analytics in the inner query may be slowing you down if you have a lot of data?
Cheers
Ben