2Gig limitation - is this limited to Unix or does it also affect VMS?

Wed, 2 Feb 2005 18:17:54 -0000

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the details below would suggest that you are correct when you say 'the
limitation was more in the C-ISAM libraries than the PowerHouse
libraries/products.', but if that is the case why limit the number of
records to 2^31, unless there is a PH internal issue after all; and if there
is a PH internal problem, does it affect VMS also ? Which is where I started
:-)

Regards, Joe. 

  _____  

From: powerh-l-admin@lists.sowder.com
[mailto:powerh-l-admin@lists.sowder.com] On Behalf Of Philip Jackson
Sent: 02 February 2005 17:47
To: powerh-l@lists.sowder.com
Subject: RE: 2Gig limitation - is this limited to Unix or does it also
affect VMS?

>From the manual for 8.4

Large File Support (UNIX)

Direct and sequential files, non-indexed subfiles and portable subfiles can
now exceed the two

gigabyte limit in total number of bytes.

The file must be recreated to be able to grow beyond two gigabytes. An
existing file cannot grow

beyond the two gigabyte limit.

The file system must be able handle large files and must be configured to
allow them.

PowerHouse 4GL can still only process up to 2,147,483,647 records.

Note: PowerHouse 8.43 supports large files for C-ISAM within the limit set
by C-ISAM version

7.25 which is greater than 2 gigabytes. The maximum number of records
supported by C-ISAM

is the same as for flat files, 2 gigabytes.

which I take to mean that non-indexed files can exceed 2,147,483,647 records
now with some system changes/file recreations, but that indexed ones can't.

Bit confusing the way they seem to use gigabytes to mean the number of
records, as opposed to the number of bytes.

I actually understood the limitation was more in the C-ISAM libraries than
the PowerHouse libraries/products.

Cheers,

Philip

  _____  

From: powerh-l-admin@lists.sowder.com
[mailto:powerh-l-admin@lists.sowder.com] On Behalf Of Joe Boyle
Sent: 02 February 2005 17:15
To: 'Johnson, Harold A EDUC:EX'; powerh-l@lists.sowder.com
Subject: RE: 2Gig limitation - is this limited to Unix or does it also
affect VMS?

I think a test case was logged on Unix using a QTP which attempted to write
records out to a subfile, and once the number of bytes written out exceeded
2^31 a fatal error occurred.  I then recall that this behaviour was fixed to
the extent that now the failure ( not error as this is a new limitation )
will occur when 2^31 'records' have been written.

I assume that quick would have the same problem when reading or writing
similar numbers of records, but I am not clear if this affects Unix only, or
if VMS would suffer similarly.

I seem to recall that BD once said that this would affect RDB's also, as the
call originally related to CISAM, I do not know if RMS on VMS is affected.

I'm not thinking of the quick screen call issue, but the underlying causes
might be related as far as I know.

I seem to recall that the limitation was a result of PH being a 32 bit
application - and presumably able to map to 'only' 2^31 addresses on the
stack.

Regards, Joe. 

  _____  

From: Johnson, Harold A EDUC:EX [mailto:Harold.A.Johnson@gems1.gov.bc.ca] 
Sent: 02 February 2005 16:37
To: 'Joe Boyle'; powerh-l@lists.sowder.com
Subject: RE: 2Gig limitation

Do you mean in QTP (ie: total size of records accessed?) or QDESIGN/QUICK?
There is a problem on OpenVMS/Powerhouse when calling screens (run screen)
in batch processing using QUICK - there is a limit as to how many times
screens can be called (~32k times).  Otherwise, I've never experienced a
problem with the number or size of data processed.    (our main application
is current hovering around the 160gb size)

-----Original Message-----
From: powerh-l-admin@lists.sowder.com
[mailto:powerh-l-admin@lists.sowder.com]On Behalf Of Joe Boyle
Sent: 2005 February 2 5:08 AM
To: powerh-l@lists.sowder.com
Subject: 2Gig limitation

Hi all,

Does anyone know if the 2 Gig processing limitation applies on VMS platforms
as well as Unix ? 

If the problem is due to the fact that PH is a 32 bit application, and I am
assuming that PH is a 32 bit application on both VMS and Unix, then the
problem is likely to exist on both - any ideas ?

For those that may not be aware of it, the limitation on Unix was that
processing would stop after processing 2 Gig bytes had been processed. This
was then partially fixed so that processing would stop when 2 Gig records (
of any acceptable byte length ) had been processed.

Regards, Joe.

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<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>the details below would suggest =
that you
are correct when you say &#8216;</span></font><font size=3D2 =
color=3Dblue
face=3DHelvetica><span =
style=3D'font-size:10.0pt;font-family:Helvetica;color:blue'>the
limitation was more in the C-ISAM libraries than the PowerHouse
libraries/products.&#8217;</span></font><font size=3D2 =
face=3DHelvetica><span
style=3D'font-size:10.0pt;font-family:Helvetica'>, but if that is the =
case why
limit the number of records to 2^31, unless there is a PH internal issue =
after
all; and if there is a PH internal problem, does it affect VMS also ? =
Which is
where I started </span></font><font size=3D2 face=3DWingdings><span
style=3D'font-size:10.0pt;font-family:Wingdings'>J</span></font><font =
size=3D2
face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p=
>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;<o:p></o:p></span></font></p>

<div>

<p><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:
Arial;color:navy'>Regards, Joe.</span></font><font color=3Dnavy><span
style=3D'color:navy'> <o:p></o:p></span></font></p>

</div>

<div>

<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>

<hr size=3D3 width=3D"100%" align=3Dcenter tabindex=3D-1>

</span></font></div>

<p class=3DMsoNormal><b><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font =
size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'>
powerh-l-admin@lists.sowder.com [mailto:powerh-l-admin@lists.sowder.com] =
<b><span
style=3D'font-weight:bold'>On Behalf Of </span></b>Philip Jackson<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> 02 February 2005 =
17:47<br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
powerh-l@lists.sowder.com<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> RE: 2Gig =
limitation - is
this limited to Unix or does it also affect =
VMS?</span></font><o:p></o:p></p>

</div>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:blue'>From the manual for =
8.4</span></font><font
size=3D5 face=3DArial><span =
style=3D'font-size:18.0pt;font-family:Arial'><o:p></o:p></span></font></p=
>

<p class=3DMsoNormal><font size=3D5 face=3DArial><span =
style=3D'font-size:18.0pt;
font-family:Arial'>&nbsp;<o:p></o:p></span></font></p>

<p class=3DMsoNormal><strong><b><font size=3D5 color=3Dblue =
face=3D"Courier New"><span
style=3D'font-size:18.0pt;font-family:"Courier New";color:blue'>Large =
File
Support (UNIX)</span></font></b></strong><font size=3D5 =
face=3DArial><span
style=3D'font-size:18.0pt;font-family:Arial'><o:p></o:p></span></font></p=
>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3D"Courier =
New"><span
style=3D'font-size:10.0pt;font-family:"Courier New";color:blue'>Direct =
and
sequential files, non-indexed subfiles and portable subfiles can now =
exceed the
two</span></font><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3D"Courier =
New"><span
style=3D'font-size:10.0pt;font-family:"Courier New";color:blue'>gigabyte =
limit in
total number of bytes.</span></font><font size=3D2 face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p=
>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3D"Courier =
New"><span
style=3D'font-size:10.0pt;font-family:"Courier New";color:blue'>The file =
must be
recreated to be able to grow beyond two gigabytes. An existing file =
cannot grow</span></font><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p=
>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3D"Courier =
New"><span
style=3D'font-size:10.0pt;font-family:"Courier New";color:blue'>beyond =
the two
gigabyte limit.</span></font><font size=3D2 face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial'><o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3D"Courier =
New"><span
style=3D'font-size:10.0pt;font-family:"Courier New";color:blue'>The file =
system
must be able handle large files and must be configured to allow =
them.</span></font><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p=
>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3D"Courier =
New"><span
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:blue'>PowerHouse 4GL
can still only process up to 2,147,483,647 records.</span></font><font =
size=3D2
face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p=
>

<p class=3DMsoNormal><b><font size=3D2 color=3Dblue face=3D"Courier =
New"><span
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:blue;font-weight:bold'>Note:
</span></font></b><font size=3D2 color=3Dblue face=3D"Courier New"><span
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:blue'>PowerHouse 8.43
supports large files for C-ISAM within the limit set by C-ISAM =
version</span></font><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p=
>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3D"Courier =
New"><span
style=3D'font-size:10.0pt;font-family:"Courier New";color:blue'>7.25 =
which is
greater than 2 gigabytes. The maximum number of records supported by =
C-ISAM</span></font><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p=
>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3D"Courier =
New"><span
style=3D'font-size:10.0pt;font-family:"Courier New";color:blue'>is the =
same as
for flat files, 2 gigabytes.</span></font><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p=
>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DHelvetica><span
style=3D'font-size:10.0pt;font-family:Helvetica;color:blue'>which I take =
to mean
that non-indexed files can exceed 2,147,483,647 records now with some
system&nbsp;changes/file recreations, but that indexed ones =
can't.</span></font><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p=
>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DHelvetica><span
style=3D'font-size:10.0pt;font-family:Helvetica;color:blue'>Bit =
confusing the way
they seem to use gigabytes to mean the number of records, as opposed to =
the
number of bytes.</span></font><font size=3D2 face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial'><o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DHelvetica><span
style=3D'font-size:10.0pt;font-family:Helvetica;color:blue'>I actually =
understood
the limitation was more in the C-ISAM libraries than the PowerHouse
libraries/products.</span></font><font size=3D2 face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p=
>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DHelvetica><span
style=3D'font-size:10.0pt;font-family:Helvetica;color:blue'>Cheers,</span=
></font><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p=
>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DHelvetica><span
style=3D'font-size:10.0pt;font-family:Helvetica;color:blue'>Philip</span>=
</font><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p=
>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>

<hr size=3D3 width=3D"100%" align=3Dcenter tabIndex=3D-1>

</span></font></div>

<p class=3DMsoNormal style=3D'margin-bottom:12.0pt'><b><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</spa=
n></font></b><font
size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'>
powerh-l-admin@lists.sowder.com [mailto:powerh-l-admin@lists.sowder.com] =
<b><span
style=3D'font-weight:bold'>On Behalf Of </span></b>Joe Boyle<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> 02 February 2005 =
17:15<br>
<b><span style=3D'font-weight:bold'>To:</span></b> 'Johnson, Harold A =
EDUC:EX';
powerh-l@lists.sowder.com<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> RE: 2Gig =
limitation - is
this limited to Unix or does it also affect =
VMS?</span></font><o:p></o:p></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>I think a test case was logged on =
Unix
using a QTP which attempted to write records out to a subfile, and once =
the
number of bytes written out exceeded 2^31 a fatal error occurred.&nbsp; =
I then
recall that this behaviour was fixed to the extent that now the failure =
( not
error as this is a new limitation ) will occur when 2^31 =
&#8216;records&#8217;
have been written.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>I assume that quick would have the =
same
problem when reading or writing similar numbers of records, but I am not =
clear
if this affects Unix only, or if VMS would suffer =
similarly.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>I seem to recall that BD once said =
that
this would affect RDB&#8217;s also, as the call originally related to =
CISAM, I
do not know if RMS on VMS is affected.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>I&#8217;m not thinking of the quick =
screen
call issue, but the underlying causes might be related as far as I =
know.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>I seem to recall that the =
limitation was a
result of PH being a 32 bit application &#8211; and presumably able to =
map to
&#8216;only&#8217; 2^31 addresses on the =
stack.<o:p></o:p></span></font></p>

<div>

<p><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:
Arial;color:navy'>Regards, Joe.</span></font><font color=3Dnavy><span
style=3D'color:navy'> <o:p></o:p></span></font></p>

</div>

<div>

<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>

<hr size=3D3 width=3D"100%" align=3Dcenter tabIndex=3D-1>

</span></font></div>

<p class=3DMsoNormal><b><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font =
size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'> =
Johnson, Harold
A EDUC:EX [mailto:Harold.A.Johnson@gems1.gov.bc.ca] <br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> 02 February 2005 =
16:37<br>
<b><span style=3D'font-weight:bold'>To:</span></b> 'Joe Boyle';
powerh-l@lists.sowder.com<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> RE: 2Gig =
limitation</span></font><o:p></o:p></p>

</div>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<div>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:blue'>Do you mean in QTP (ie: total size =
of
records accessed?) or QDESIGN/QUICK?&nbsp;&nbsp;&nbsp; There is a =
problem on
OpenVMS/Powerhouse when calling screens (run screen) in batch processing =
using
QUICK - there is a limit as to how many times&nbsp;screens can be called =
(~32k
times).&nbsp; Otherwise, I've never experienced a problem with the =
number or
size of data processed.&nbsp;&nbsp;&nbsp; (our main application is =
current
hovering around the 160gb size)</span></font><o:p></o:p></p>

</div>

<div>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

</div>

<div>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

</div>

<blockquote =
style=3D'margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt'>

<p class=3DMsoNormal style=3D'margin-bottom:12.0pt'><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'>-----Original =
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b>
powerh-l-admin@lists.sowder.com =
[mailto:powerh-l-admin@lists.sowder.com]<b><span
style=3D'font-weight:bold'>On Behalf Of </span></b>Joe Boyle<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> 2005 February 2 =
5:08 AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
powerh-l@lists.sowder.com<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> 2Gig =
limitation</span></font><o:p></o:p></p>

<p><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'><!-- Converted from =
text/rtf format -->Hi
all,</span></font><o:p></o:p></p>

<p><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>Does
anyone know if the 2 Gig processing limitation applies on VMS platforms =
as well
as Unix ?</span></font> <o:p></o:p></p>

<p><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>If
the problem is due to the fact that PH is a 32 bit application, =
and</span></font>
<font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>I am
assuming that</span></font> <font size=3D2 face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial'>PH is a 32 bit application on both VMS and =
Unix, then
the problem is likely to exist on both</span></font> <font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>- any ideas =
?</span></font><o:p></o:p></p>

For
those that may not be aware of it, the limitation on Unix was that =
processing
would stop after processing 2 Gig bytes had been =
processed. This
was then partially fixed so that processing would stop when =
2 Gig
records ( of any acceptable byte length ) had been =
processed.<o:p></o:p>

<p><a name=3D""><font size=3D2 face=3DArial><span lang=3DEN-GB =
style=3D'font-size:10.0pt;
font-family:Arial'>Regards, Joe.</span></font></a><o:p></o:p></p>

This e-mail and all information contained in it is confidential =
and may
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or copying by you of this e-mail or any of the information contained =
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author.<o:p></o:p>

</blockquote>

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