RE: [bdbxml] Adding XML documents slows down when the container contains large number of documents[#14407]
"Younger Wang" <[email protected]> Mon, 17 Apr 2006 12:59:02 +0800
| Newsgroups | gmane.comp.db.dbxml.general |
|---|---|
| Message-ID | <001901c661db$a7484020$1664640a@younger> |
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Hi,
=20
I think I have found the cause. Before adding a new document, my program
queries against the database. Since I haven=A1=AFt created any index, =
the query
takes a very long time when the database becomes large.=20
=20
Now I have another question. In my XML documents, namespace is not =
declared.
When I add an index, which namespace shall I use? I added index like =
=A1=B0
addindex "" CPEInfo/ModelID edge-element-equality-string =A1=B0, but the =
query
plan showed the index was invalid for =A1=B0
collection("cpeinfo.dbxml")/CPEInfo/ModelID =A1=B1
=20
BR
Younger Wang
=20
=20
_____ =20
From: Younger Wang [mailto:[email protected]]=20
Sent: 2006=C4=EA4=D4=C217=C8=D5 12:51
To: [email protected]
Subject: RE: [bdbxml] Adding XML documents slows down when the container
contains large number of documents[#14407]
=20
In my test of adding documents,
1. Size of the document is only 3KB.=20
2. Schema validation is not enabled.=20
3. I did not create any index yet.=20
4. I did try to adjust cache size. I tried both default cache size
(256KB) and 50M and they performed equally.
5. My test program is single-threaded. The program reads a template =
from
container A, generates a new XML document according to the template, and
saves the new document to container B. I am quite sure reading from
container A and generating a new XML document did not slow down because =
the
program completes instantly when the adding part was commented.
6. Transaction is enabled.
7. DB_CONFIG is:=20
set_lk_max_lockers 10000
set_lk_max_objects 10000
set_lk_max_locks 10000
=20
BR
Younger Wang
=20
=20
_____ =20
From: Younger Wang [mailto:[email protected]]=20
Sent: 2006=C4=EA4=D4=C214=C8=D5 14:06
To: [email protected]
Subject: [bdbxml] Adding XML documents slows down when the container
contains large number of documents[#14407]
=20
Hi,
=20
When the container is empty, adding 100 documents takes 32 seconds; When =
the
container contains 10,000 documents, adding 100 takes 492 seconds. That =
is
too slow. How can I solve the problem? Thanks!
=20
BR
Younger Wang
=20
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<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3D"Courier =
New"><span lang=3DEN-US
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:navy'>Hi,<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3D"Courier =
New"><span lang=3DEN-US
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:navy'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3D"Courier =
New"><span lang=3DEN-US
style=3D'font-size:10.0pt;font-family:"Courier New";color:navy'>I think =
I have
found the cause. Before adding a new document, my program queries =
against the
database. Since I haven=A1=AFt created any index, the query takes a very =
long time
when the database becomes large. <o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3D"Courier =
New"><span lang=3DEN-US
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:navy'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3D"Courier =
New"><span lang=3DEN-US
style=3D'font-size:10.0pt;font-family:"Courier New";color:navy'>Now I =
have
another question. In my XML documents, namespace is not declared. When I =
add an
index, which namespace shall I use? I added index like =A1=B0 =
</span></font><font
size=3D1 color=3Dnavy face=3D"Courier New"><span lang=3DEN-US =
style=3D'font-size:8.0pt;
font-family:"Courier New";color:navy'>addindex "" =
CPEInfo/ModelID
edge-element-equality-string</span></font><font size=3D2 color=3Dnavy
face=3D"Courier New"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Courier New";
color:navy'> =A1=B0, but the query plan showed the index was invalid for =
=A1=B0 collection("cpeinfo.dbxml")/CPEInfo/ModelID
=A1=B1<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3D"Courier =
New"><span lang=3DEN-US
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:navy'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3D"Courier =
New"><span lang=3DEN-US
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:navy'>BR<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3D"Courier =
New"><span lang=3DEN-US
style=3D'font-size:10.0pt;font-family:"Courier New";color:navy'>Younger =
Wang<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D1 color=3Dnavy face=3DArial><span =
lang=3DEN-US
style=3D'font-size:9.0pt;font-family:Arial;color:navy'><o:p> </o:p><=
/span></font></p>
<p class=3DMsoNormal><font size=3D1 color=3Dnavy face=3DArial><span =
lang=3DEN-US
style=3D'font-size:9.0pt;font-family:Arial;color:navy'><o:p> </o:p><=
/span></font></p>
<div>
<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
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face=3D=CB=CE=CC=E5><span lang=3DEN-US =
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<hr size=3D2 width=3D"100%" align=3Dcenter tabindex=3D-1>
</span></font></div>
<p class=3DMsoNormal align=3Dleft style=3D'text-align:left'><b><font =
size=3D2
face=3DTahoma><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:Tahoma;
font-weight:bold'>From:</span></font></b><font size=3D2 =
face=3DTahoma><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:Tahoma'> Younger Wang
[mailto:[email protected]] <br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> =
2006</span></font><font
size=3D2 face=3D=CB=CE=CC=E5><span =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'>=C4=EA</span></font><=
font
size=3D2 face=3DTahoma><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:Tahoma'>4</span></font><font
size=3D2 face=3D=CB=CE=CC=E5><span =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'>=D4=C2</span></font><=
font
size=3D2 face=3DTahoma><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:Tahoma'>17</span></font><font
size=3D2 face=3D=CB=CE=CC=E5><span =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'>=C8=D5</span></font><=
font
size=3D2 face=3DTahoma><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:Tahoma'>
12:51<br>
<b><span style=3D'font-weight:bold'>To:</span></b> <st1:PersonName =
w:st=3D"on">[email protected]</st1:PersonName><br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> RE: [bdbxml] =
Adding XML
documents slows down when the container contains large number of
documents[#14407]</span></font><font size=3D3 face=3D=CB=CE=CC=E5><span =
lang=3DEN-US
style=3D'font-size:12.0pt;font-family:=CB=CE=CC=E5'><o:p></o:p></span></f=
ont></p>
</div>
<p class=3DMsoNormal align=3Dleft style=3D'text-align:left'><font =
size=3D2
face=3D"Times New Roman"><span lang=3DEN-US =
style=3D'font-size:10.5pt'><o:p> </o:p></span></font></p>
<p class=3DMsoPlainText><font size=3D2 face=3D"Courier New"><span =
lang=3DEN-US
style=3D'font-size:10.0pt;font-family:"Courier New"'>In my test of =
adding
documents,<o:p></o:p></span></font></p>
<p class=3DMsoPlainText =
style=3D'margin-left:18.0pt;text-indent:-18.0pt;mso-list:
l0 level1 lfo2'><![if !supportLists]><font size=3D2 face=3D"Courier =
New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier New"'><span
style=3D'mso-list:Ignore'>1.<font size=3D1 face=3D"Times New =
Roman"><span
style=3D'font:7.0pt "Times New Roman"'> =
</span></font></span></span></font><![endif]><font
size=3D2 face=3D"Courier New"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:
"Courier New"'>Size of the document is only 3KB. =
<o:p></o:p></span></font></p>
<p class=3DMsoPlainText =
style=3D'margin-left:18.0pt;text-indent:-18.0pt;mso-list:
l0 level1 lfo2'><![if !supportLists]><font size=3D2 face=3D"Courier =
New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier New"'><span
style=3D'mso-list:Ignore'>2.<font size=3D1 face=3D"Times New =
Roman"><span
style=3D'font:7.0pt "Times New Roman"'> =
</span></font></span></span></font><![endif]><font
size=3D2 face=3D"Courier New"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:
"Courier New"'>Schema validation is not enabled. =
<o:p></o:p></span></font></p>
<p class=3DMsoPlainText =
style=3D'margin-left:18.0pt;text-indent:-18.0pt;mso-list:
l0 level1 lfo2'><![if !supportLists]><font size=3D2 face=3D"Courier =
New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier New"'><span
style=3D'mso-list:Ignore'>3.<font size=3D1 face=3D"Times New =
Roman"><span
style=3D'font:7.0pt "Times New Roman"'> =
</span></font></span></span></font><![endif]><font
size=3D2 face=3D"Courier New"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:
"Courier New"'>I did not create any index yet. =
<o:p></o:p></span></font></p>
<p class=3DMsoPlainText =
style=3D'margin-left:18.0pt;text-indent:-18.0pt;mso-list:
l0 level1 lfo2'><![if !supportLists]><font size=3D2 face=3D"Courier =
New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier New"'><span
style=3D'mso-list:Ignore'>4.<font size=3D1 face=3D"Times New =
Roman"><span
style=3D'font:7.0pt "Times New Roman"'> =
</span></font></span></span></font><![endif]><font
size=3D2 face=3D"Courier New"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:
"Courier New"'>I did try to adjust cache size. I tried both default =
cache size
(256KB) and 50M and they performed equally.<o:p></o:p></span></font></p>
<p class=3DMsoPlainText =
style=3D'margin-left:18.0pt;text-indent:-18.0pt;mso-list:
l0 level1 lfo2'><![if !supportLists]><font size=3D2 face=3D"Courier =
New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier New"'><span
style=3D'mso-list:Ignore'>5.<font size=3D1 face=3D"Times New =
Roman"><span
style=3D'font:7.0pt "Times New Roman"'> =
</span></font></span></span></font><![endif]><font
size=3D2 face=3D"Courier New"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:
"Courier New"'>My test program is single-threaded. The program reads a =
template
from container A, generates a new XML document according to the =
template, and
saves the new document to container B. I am quite sure reading from =
container A
and generating a new XML document did not slow down because the program
completes instantly when the adding part was =
commented.<o:p></o:p></span></font></p>
<p class=3DMsoPlainText =
style=3D'margin-left:18.0pt;text-indent:-18.0pt;mso-list:
l0 level1 lfo2'><![if !supportLists]><font size=3D2 face=3D"Courier =
New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier New"'><span
style=3D'mso-list:Ignore'>6.<font size=3D1 face=3D"Times New =
Roman"><span
style=3D'font:7.0pt "Times New Roman"'> =
</span></font></span></span></font><![endif]><font
size=3D2 face=3D"Courier New"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:
"Courier New"'>Transaction is enabled.<o:p></o:p></span></font></p>
<p class=3DMsoPlainText =
style=3D'margin-left:18.0pt;text-indent:-18.0pt;mso-list:
l0 level1 lfo2'><![if !supportLists]><font size=3D2 face=3D"Courier =
New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier New"'><span
style=3D'mso-list:Ignore'>7.<font size=3D1 face=3D"Times New =
Roman"><span
style=3D'font:7.0pt "Times New Roman"'> =
</span></font></span></span></font><![endif]><font
size=3D2 face=3D"Courier New"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:
"Courier New"'>DB_CONFIG is: <o:p></o:p></span></font></p>
<p class=3DMsoPlainText style=3D'margin-left:21.0pt'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'>set_lk_max_lockers
10000<o:p></o:p></span></font></p>
<p class=3DMsoPlainText style=3D'margin-left:21.0pt'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'>set_lk_max_objects
10000<o:p></o:p></span></font></p>
<p class=3DMsoPlainText style=3D'margin-left:21.0pt'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'>set_lk_max_locks
10000<o:p></o:p></span></font></p>
<p class=3DMsoPlainText><font size=3D2 face=3D"Courier New"><span =
lang=3DEN-US
style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoPlainText><font size=3D2 face=3D"Courier New"><span =
lang=3DEN-US
style=3D'font-size:10.0pt;font-family:"Courier =
New"'>BR<o:p></o:p></span></font></p>
<p class=3DMsoPlainText><font size=3D2 face=3D"Courier New"><span =
lang=3DEN-US
style=3D'font-size:10.0pt;font-family:"Courier New"'>Younger =
Wang<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D1 color=3Dnavy face=3DArial><span =
lang=3DEN-US
style=3D'font-size:9.0pt;font-family:Arial;color:navy'><o:p> </o:p><=
/span></font></p>
<p class=3DMsoNormal><font size=3D1 color=3Dnavy face=3DArial><span =
lang=3DEN-US
style=3D'font-size:9.0pt;font-family:Arial;color:navy'><o:p> </o:p><=
/span></font></p>
<div>
<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span lang=3DEN-US style=3D'font-size:12.0pt'>
<hr size=3D2 width=3D"100%" align=3Dcenter tabindex=3D-1>
</span></font></div>
<p class=3DMsoNormal align=3Dleft style=3D'text-align:left'><b><font =
size=3D2
face=3DTahoma><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:Tahoma;
font-weight:bold'>From:</span></font></b><font size=3D2 =
face=3DTahoma><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:Tahoma'> Younger Wang =
[mailto:[email protected]]
<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> =
2006</span></font><font
size=3D2 face=3D=CB=CE=CC=E5><span =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'>=C4=EA</span></font><=
font
size=3D2 face=3DTahoma><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:Tahoma'>4</span></font><font
size=3D2 face=3D=CB=CE=CC=E5><span =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'>=D4=C2</span></font><=
font
size=3D2 face=3DTahoma><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:Tahoma'>14</span></font><font
size=3D2 face=3D=CB=CE=CC=E5><span =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'>=C8=D5</span></font><=
font
size=3D2 face=3DTahoma><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:Tahoma'>
14:06<br>
<b><span style=3D'font-weight:bold'>To:</span></b> <st1:PersonName =
w:st=3D"on">[email protected]</st1:PersonName><br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> [bdbxml] Adding =
XML
documents slows down when the container contains large number of
documents[#14407]</span></font><font size=3D3><span lang=3DEN-US =
style=3D'font-size:
12.0pt'><o:p></o:p></span></font></p>
</div>
<p class=3DMsoNormal align=3Dleft style=3D'text-align:left'><font =
size=3D2
face=3D"Times New Roman"><span lang=3DEN-US =
style=3D'font-size:10.5pt'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'layout-grid-mode:char'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'>Hi,<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'layout-grid-mode:char'><font size=3D2 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'layout-grid-mode:char'><font size=3D1 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:9.0pt;font-family:"Courier New"'>When =
the container
is empty, adding 100 documents takes 32 seconds; When the container =
contains
10,000 documents, adding 100 takes 492 seconds. That is too slow. How =
can I
solve the problem? Thanks!<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'layout-grid-mode:char'><font size=3D1 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:9.0pt;font-family:"Courier =
New"'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'layout-grid-mode:char'><font size=3D1 =
face=3D"Courier New"><span
lang=3DEN-US style=3D'font-size:9.0pt;font-family:"Courier New"'>BR<br>
Younger Wang<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D1 face=3DArial><span lang=3DEN-US =
style=3D'font-size:
9.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
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