Tune hierarchy query

Question

Hi,
I have a table which holds geographical data in a hierrachical format. I need to retriev all the parent-information in a single query.
The table is called CX_GEO_DATA, which stores hierrarchy relations .
eg of data
row_id type name parent_id start_dt end_dt
1 Zip 400 2 1/2/2009 1/1/2020
2 City San
I need to extract all the parent information from the table, i.e. given a row_id, find its parents.
Since it is a part of UI requiremnt a performence of 5 secs is desired.
SELECT A.type,
     a.name,
          A.ALT_NAME,
          LEVEL,
               a.start_dt,
               a.end_dt,
               a.par_geo_data_id,
          a.row_id
          FROM cx_geo_data A
WHERE TRUNC(SYSDATE) BETWEEN START_DT AND NVL(END_DT,SYSDATE+1)
               START WITH row_id = :p_row_id
CONNECT BY PRIOR par_geo_data_id = row_id
There are indexes in table on columns:
Non unique par_geo_data_id
Non unique name
Unique Row_id (Primary key)
I need result in the below form:
i.e. given a row_id find all the parents for that record.
Say if I get a Zip, get all its parents, i.e. Country, state, City, Zip etc
To achieve that I have written a function:
Which uses the query listed on top. i.e. a connect by query and returns a given type of parent.
Below is the function code:
FUNCTION get_par_at_a_level_info
p_row_id varchar2,
p_type_of_Parent varchar2
RETURN VARCHAR2
IS
vParent_Name cx_geo_data.alt_name%type;
BEGIN
SELECT alt_name
INTO vParent_Name
FROM (
SELECT A.type,
     a.name,
          A.ALT_NAME,
          LEVEL,
          a.row_id
          FROM cx_geo_data A
WHERE TRUNC(SYSDATE) BETWEEN START_DT AND NVL(END_DT,SYSDATE+1)
START WITH row_id = p_row_id
CONNECT BY PRIOR par_geo_data_id = row_id
)hier_tab
WHERE hier_tab.type=p_type_of_Parent;
return(initCap(vParent_Name));
EXCEPTION
WHEN no_data_found
THEN RETURN NULL;
WHEN OTHERS
THEN RAISE;
END get_par_at_a_level_info;
So, if I need type of parent as Country I pass country to it, if I need City I pass City to the function.
So, my final query is like:
SELECT GEO_TYPE,
GEO_NAME,
     geoElementId GEO_ELEMENT_ID,
          xxfdev_geo_bndary_pkg.Get_Par_at_a_level_info(geoElementId,'Country') COUNTRY,
     xxfdev_geo_bndary_pkg.Get_Par_at_a_level_info(geoElementId,'State') STATE,
     ---     xxfdev_geo_bndary_pkg.Get_Par_at_a_level_info(geoElementId,'City') CITY,
     xxfdev_geo_bndary_pkg.Get_Par_at_a_level_info(geoElementId,'Zip') ZIP
     FROM ( SELECT
     ---------restirction by user ideally nt reqd
     terr_gb.name NAME,
INITCAP(geo.alt_name) GEO_NAME,
     geo.geoElementId,
     geo.TYPE GEO_TYPE,
     from cx_geo_data
where row_id=p_row_id
);

Answer 1

let me know on how to tune this query or if there is any option to re-write it in any other form.