Optimizing bulk xml data insert in postgresql 9.6
I am currently optimizing an xml parser where I currently have a bottleneck on a bulk insert of 10,000 records into an xml array in postgres. This version of postgres does not implement xmltable. The following code is what I currently have:
create unlogged table xmltable(
xml_element1 xml,
xml_element2 xml,
xml_element3 xml
);
v_xml := XMLPARSE(DOCUMENT convert_from(src_blob, 'UTF8') );
INSERT INTO xmltable ( xml_element1, xml_element2, xml_element3)
SELECT
(xpath ('element1parent/element1feature', x_xml)),
(xpath ('element2parent/element2feature', x_xml)),
(xpath ('element3parent/element3feature', x_xml)),
FROM (SELECT unnest(xpath('/Root/grandparent',v_xml)) as x_xml);
drop table xmltable;
Current processing time is about 4 minutes for xml_element1 = 40 inserts,
xml_element2 = 9,980 inserts, xml_element3 = 0 inserts.
A couple things I've tried are:
Switch between temporary and unlogged table
Breaking up query
using v_xml := convert_from(src_blob, 'UTF8')::xml
Any insight would be greatly appreciated!
xml postgresql xpath query-optimization
asked Nov 15 '18 at 18:02
user10659111user10659111
61
add a comment |
I am currently optimizing an xml parser where I currently have a bottleneck on a bulk insert of 10,000 records into an xml array in postgres. This version of postgres does not implement xmltable. The following code is what I currently have:
create unlogged table xmltable(
xml_element1 xml,
xml_element2 xml,
xml_element3 xml
);
v_xml := XMLPARSE(DOCUMENT convert_from(src_blob, 'UTF8') );
INSERT INTO xmltable ( xml_element1, xml_element2, xml_element3)
SELECT
(xpath ('element1parent/element1feature', x_xml)),
(xpath ('element2parent/element2feature', x_xml)),
(xpath ('element3parent/element3feature', x_xml)),
FROM (SELECT unnest(xpath('/Root/grandparent',v_xml)) as x_xml);
drop table xmltable;
Current processing time is about 4 minutes for xml_element1 = 40 inserts,
xml_element2 = 9,980 inserts, xml_element3 = 0 inserts.
A couple things I've tried are:
Switch between temporary and unlogged table
Breaking up query
using v_xml := convert_from(src_blob, 'UTF8')::xml
Any insight would be greatly appreciated!
xml postgresql xpath query-optimization
asked Nov 15 '18 at 18:02
user10659111user10659111
61
add a comment |
I am currently optimizing an xml parser where I currently have a bottleneck on a bulk insert of 10,000 records into an xml array in postgres. This version of postgres does not implement xmltable. The following code is what I currently have:
create unlogged table xmltable(
xml_element1 xml,
xml_element2 xml,
xml_element3 xml
);
v_xml := XMLPARSE(DOCUMENT convert_from(src_blob, 'UTF8') );
INSERT INTO xmltable ( xml_element1, xml_element2, xml_element3)
SELECT
(xpath ('element1parent/element1feature', x_xml)),
(xpath ('element2parent/element2feature', x_xml)),
(xpath ('element3parent/element3feature', x_xml)),
FROM (SELECT unnest(xpath('/Root/grandparent',v_xml)) as x_xml);
drop table xmltable;
Current processing time is about 4 minutes for xml_element1 = 40 inserts,
xml_element2 = 9,980 inserts, xml_element3 = 0 inserts.
A couple things I've tried are:
Switch between temporary and unlogged table
Breaking up query
using v_xml := convert_from(src_blob, 'UTF8')::xml
Any insight would be greatly appreciated!
xml postgresql xpath query-optimization
asked Nov 15 '18 at 18:02
user10659111user10659111
61
I am currently optimizing an xml parser where I currently have a bottleneck on a bulk insert of 10,000 records into an xml array in postgres. This version of postgres does not implement xmltable. The following code is what I currently have:
create unlogged table xmltable(
xml_element1 xml,
xml_element2 xml,
xml_element3 xml
);
v_xml := XMLPARSE(DOCUMENT convert_from(src_blob, 'UTF8') );
INSERT INTO xmltable ( xml_element1, xml_element2, xml_element3)
SELECT
(xpath ('element1parent/element1feature', x_xml)),
(xpath ('element2parent/element2feature', x_xml)),
(xpath ('element3parent/element3feature', x_xml)),
FROM (SELECT unnest(xpath('/Root/grandparent',v_xml)) as x_xml);
drop table xmltable;
Current processing time is about 4 minutes for xml_element1 = 40 inserts,
xml_element2 = 9,980 inserts, xml_element3 = 0 inserts.
A couple things I've tried are:
Switch between temporary and unlogged table
Breaking up query
using v_xml := convert_from(src_blob, 'UTF8')::xml
Any insight would be greatly appreciated!
xml postgresql xpath query-optimization
xml postgresql xpath query-optimization
asked Nov 15 '18 at 18:02
user10659111user10659111
61
asked Nov 15 '18 at 18:02
user10659111user10659111
61
asked Nov 15 '18 at 18:02
user10659111user10659111
61
asked Nov 15 '18 at 18:02
user10659111user10659111
61
asked Nov 15 '18 at 18:02
user10659111user10659111
61
61
add a comment |
add a comment |
1 Answer
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oldest
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I figured it out, the unnest function is unescessary and accumulates alot of overhead.
This was way faster:
INSERT INTO xmltable ( xml_element1, xml_element2, xml_element3)
SELECT
(xpath ('/Root/grandparent/element1parent/element1feature', v_xml)),
(xpath ('/Root/grandparent/element2parent/element2feature', v_xml)),
(xpath ('/Root/grandparent/element3parent/element3feature', v_xml));
answered Nov 15 '18 at 20:39
user10659111user10659111
61
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
I figured it out, the unnest function is unescessary and accumulates alot of overhead.
This was way faster:
INSERT INTO xmltable ( xml_element1, xml_element2, xml_element3)
SELECT
(xpath ('/Root/grandparent/element1parent/element1feature', v_xml)),
(xpath ('/Root/grandparent/element2parent/element2feature', v_xml)),
(xpath ('/Root/grandparent/element3parent/element3feature', v_xml));
answered Nov 15 '18 at 20:39
user10659111user10659111
61
add a comment |
I figured it out, the unnest function is unescessary and accumulates alot of overhead.
This was way faster:
INSERT INTO xmltable ( xml_element1, xml_element2, xml_element3)
SELECT
(xpath ('/Root/grandparent/element1parent/element1feature', v_xml)),
(xpath ('/Root/grandparent/element2parent/element2feature', v_xml)),
(xpath ('/Root/grandparent/element3parent/element3feature', v_xml));
answered Nov 15 '18 at 20:39
user10659111user10659111
61
add a comment |
I figured it out, the unnest function is unescessary and accumulates alot of overhead.
This was way faster:
INSERT INTO xmltable ( xml_element1, xml_element2, xml_element3)
SELECT
(xpath ('/Root/grandparent/element1parent/element1feature', v_xml)),
(xpath ('/Root/grandparent/element2parent/element2feature', v_xml)),
(xpath ('/Root/grandparent/element3parent/element3feature', v_xml));
answered Nov 15 '18 at 20:39
user10659111user10659111
61
I figured it out, the unnest function is unescessary and accumulates alot of overhead.
This was way faster:
INSERT INTO xmltable ( xml_element1, xml_element2, xml_element3)
SELECT
(xpath ('/Root/grandparent/element1parent/element1feature', v_xml)),
(xpath ('/Root/grandparent/element2parent/element2feature', v_xml)),
(xpath ('/Root/grandparent/element3parent/element3feature', v_xml));
answered Nov 15 '18 at 20:39
user10659111user10659111
61
answered Nov 15 '18 at 20:39
user10659111user10659111
61
answered Nov 15 '18 at 20:39
user10659111user10659111
61
answered Nov 15 '18 at 20:39
user10659111user10659111
61
61
add a comment |
add a comment |
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