UPD Намерих доста голям xml файл (140 KB). Моята система:лаптоп с процесор core i5 (2400 MHz), oracle 12c във виртуална машина, време за обработка - 0,38 секунди. Този метод е единствената алтернатива, която познавам. Пример за xml тук намерих на w3schools.com.
declare
xml_str clob := q'[<?xml version="1.0" encoding="UTF-8"?>
<CATALOG>
<CD>
<TITLE>Empire Burlesque</TITLE>
<ARTIST>Bob Dylan</ARTIST>
<COUNTRY>USA</COUNTRY>
<COMPANY>Columbia</COMPANY>
<PRICE>10.90</PRICE>
<YEAR>1985</YEAR>
</CD>
<CD>
<TITLE>Hide your heart</TITLE>
<ARTIST>Bonnie Tyler</ARTIST>
<COUNTRY>UK</COUNTRY>
<COMPANY>CBS Records</COMPANY>
<PRICE>9.90</PRICE>
<YEAR>1988</YEAR>
</CD>
</CATALOG>]';
v_doc dbms_xmldom.domdocument;
node dbms_xmldom.domnode;
txt varchar2(4000);
type t_list is table of number index by varchar2(4000);
v_list t_list;
procedure enum_nodes(n dbms_xmldom.domnode, tag_name varchar2) is
chn dbms_xmldom.domnode;
nl dbms_xmldom.domnodelist;
begin
nl := dbms_xmldom.getchildnodes(n);
for i in 0..dbms_xmldom.getlength(nl) loop
chn := dbms_xmldom.item(nl, i);
if dbms_xmldom.getnodetype(chn) = 1 then
enum_nodes(chn, tag_name || dbms_xmldom.getnodeName(chn) || '/');
elsif dbms_xmldom.getnodetype(chn) = 3 then
v_list(tag_name || dbms_xmldom.getnodevalue(chn)) := 1;
end if;
end loop;
end;
begin
v_doc := dbms_xmldom.newdomdocument(xml_str);
node := dbms_xmldom.makenode(v_doc);
enum_nodes(node, '/');
txt := v_list.first;
while txt is not null loop
dbms_output.put_line(txt);
txt := v_list.next(txt);
end loop;
end;
/