File limit reached in Quick screen
Deskin, Bob
Bob.Deskin@Cognos.COM
Fri, 5 Nov 2004 06:44:02 -0500
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The PowerHouse internal architecture is based on a large number of =
tables that store information on things such as physical files, logical =
files, items, fields, etc. These tables are all cross linked by a table =
entry id. Guess what, the number of bits originally allocated for the =
number of files in a screen was 5 bits giving 31 entries (2^5 - 1). Why =
5 bits? Because in those days (late 70s) we were working on the HP3000 =
under MPE and there was a fixed data stack of 32K words (64K bytes). =
Every bit/byte was precious. And we though that 31 was HUGE. And it was =
for a while.
=20
The thing is that to restructure the tables and find all the references =
(and cross references in other tables and their references) is a major =
task. It's not necessarily difficult but it is picky, time-consuming =
work. So it was always a trade-off between doing that one thing versus =
many other things. Based on priorities, resources, and user demand, the =
other things always won.
Bob Deskin =20
Senior Product Manager, Application Development Tools=20
Cognos Inc. 3755 Riverside Drive, Ottawa ON K1G 4K9 CANADA=20
bob.deskin@cognos.com (613) 738-1338 ext 7268=20
-----Original Message-----
From: powerh-l-admin@lists.sowder.com =
[mailto:powerh-l-admin@lists.sowder.com]On Behalf Of =
Mikael.Olesen@qss-uk.com
Sent: November 5, 2004 3:26 AM
To: powerh-l@lists.sowder.com
Subject: RE: File limit reached in Quick screen
There are ways of working around the problem but I have always been a =
bit annoyed
about the 31 files limit. Why 31? and why don't Cognos change it? Bob?
=20
Kind Regards
Mikael Olesen
=20
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contact the sender as soon as possible.
Reed Business Information Ltd. and its subsidiary companies
Tel: +44 (0)20 8652 3500
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<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D258563411-05112004>The=20
PowerHouse internal architecture is based on a large number of tables =
that store=20
information on things such as physical files, logical files, items, =
fields, etc.=20
These tables are all cross linked by a table entry id. Guess what, the =
number of=20
bits originally allocated for the number of files in a screen was 5 bits =
giving=20
31 entries (2^5 - 1). Why 5 bits? Because in those days (late 70s) we =
were=20
working on the HP3000 under MPE and there was a fixed data stack of 32K =
words=20
(64K bytes). Every bit/byte was precious. And we though that 31 was =
HUGE. And it=20
was for a while.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D258563411-05112004></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D258563411-05112004>The=20
thing is that to restructure the tables and find all the references (and =
cross=20
references in other tables and their references) is a major task. It's =
not=20
necessarily difficult but it is picky, time-consuming work. So =
it was=20
always a trade-off between doing that one thing versus many other =
things.=20
Based on priorities, resources, and user demand, the other things =
always=20
won.</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D258563411-05112004>
<P><FONT face=3DArial size=3D2>Bob=20
Deskin &=
nbsp; =20
</FONT><BR><FONT face=3DArial size=3D2>Senior</FONT> <FONT face=3DArial =
size=3D2>Product=20
Manager</FONT><FONT face=3DArial size=3D2>,</FONT> <FONT face=3DArial=20
size=3D2>Application Development Tools</FONT> <BR><FONT face=3DArial =
size=3D2>Cognos=20
Inc.</FONT><FONT face=3DArial size=3D2></FONT> <FONT face=3DArial =
size=3D2>3755=20
Riverside Drive</FONT><FONT face=3DArial size=3D2>,</FONT> <FONT =
face=3DArial=20
size=3D2>Ottawa ON K1G 4K9 CANADA</FONT> <BR><FONT face=3DArial=20
size=3D2>bob.deskin@cognos.com</FONT><FONT face=3DArial size=3D2></FONT> =
<FONT=20
face=3DArial size=3D2>(613) 738-1338 ext</FONT> <FONT face=3DArial =
size=3D2>7268</FONT>=20
</P></SPAN></FONT></DIV>
<BLOCKQUOTE>
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B>=20
powerh-l-admin@lists.sowder.com =
[mailto:powerh-l-admin@lists.sowder.com]<B>On=20
Behalf Of </B>Mikael.Olesen@qss-uk.com<BR><B>Sent:</B> November 5, =
2004 3:26=20
AM<BR><B>To:</B> powerh-l@lists.sowder.com<BR><B>Subject:</B> RE: File =
limit=20
reached in Quick screen<BR><BR></FONT></DIV>
<DIV class=3DSection1>
<P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">There are =
ways of=20
working around the problem but I have always been a bit=20
annoyed</SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">about the =
31 files=20
limit. Why 31? and why don't Cognos change it? Bob?</SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: =
Arial"></SPAN></FONT> </P>
<P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Kind=20
Regards</SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DArial color=3Dnavy size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Mikael=20
Olesen</SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV><FONT=20
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=
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<BR>Recipient may=20
constitute a breach of civil or criminal law and is <BR>strictly =
prohibited.=20
If you are not the Intended Recipient, please <BR>contact the sender =
as soon=20
as possible.<BR><BR>Reed Business Information Ltd. and its subsidiary=20
companies<BR>Tel: +44 (0)20 8652=20
=
3500<BR><BR>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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