Bad Advice Gus Bjrklund PUG Challenge Americas, Westford, MA 5 to - - PowerPoint PPT Presentation

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Bad Advice Gus Bjrklund PUG Challenge Americas, Westford, MA 5 to - - PowerPoint PPT Presentation

Mar 06, 2024 271 likes •914 views

Bad Advice Gus Bjrklund PUG Challenge Americas, Westford, MA 5 to 8 June 2011 Bad Advice 1 Topics A collection of Scurrilous rumors, Lies, Old wives tales, Marketing, Rules of thumb, Half truths, and

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Bad Advice

Gus Björklund PUG Challenge Americas, Westford, MA 5 to 8 June 2011

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Topics

  • A collection of

– Scurrilous rumors, – Lies, – Old wives tales, – Marketing, – Rules of thumb, – Half truths, – and "just plain wrong" stuff

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You must have all heard some. Where do these things come from ?

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I heard it from my dentist. He knows it's true. He was having his car serviced and the mechanic told him his daughter's coach had said that ...

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DHMO is a bad chemical

  • responsible for many deaths
  • a major component of acid rain
  • accelerates corrosion
  • erodes the natural landscape
  • is an additive in some junk foods
  • found in drinking water in many areas

dihydrogen monoxide available generically as hydrogen hydroxide

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> Set -spin to 10,000 times the number of processors you have,

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Das ist nicht nur nicht richtig, es ist nicht einmal falsch!

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"that's not right. it's not even wrong !"

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FLASH ! We have brand-new rumor, started yesterday at the DB workshop by Dan Foreman: Set –spin to: your birth year * 3.14159

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> if you sign up with the "National Do Not E-Mail Registry" then you will no longer get spam.

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> Set –B so the database buffer pool memory is 10 % of your database size

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balderdash !

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balderdash |ˈbôldəӚrˌda sh | noun senseless talk or writing; nonsense : she dismissed talk of plots as “bunkum and balderdash.” ORIGIN late 16th cent. (denoting a frothy liquid; later, an unappetizing mixture of drinks): of unknown origin.

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> Truncate your before-image log every day.

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balderdash !

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> Dump and load your database every three months.

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balderdash !

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> The 1969 moon landing was a

  • fake. It was filmed inside a large

warehouse in Arizona.

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> You don't need to worry about performance because you can always get a bigger machine and hardware is cheap.

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> I just made a one line change. We don't need to test it.

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> The Cloud. Everyone who is anyone is going there. When will you?

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Go to Mary Szekely's talk about Multi-tenant table programming for the real story.

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> With the OpenEdge RDBMS, you don't need a DBA.

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> Our RAID 5 disk array is cheap. Performance is great. It will make you happy.

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"that's not right. it's not even wrong !"

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> RAID 5 doesn't work all that well. After years of intensive research, we have solved the problems with our new RAID-EXP. Performance is great. It will make you happy.

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be afraid !

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> With disk mirroring you don't have to do backups anymore, right?

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> CAN-DO () is faster than LOOKUP ()

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How to measure it, if you really must know: startTime = etime(false). do nLoops = 1 to 500000: can-do ("aa,bb,dd,ff,gg,tt,yy,uu,ii,jj kk,jj,hh,ab,ww", "ab"). end. elapsedTime = (etime(false) - startTime). display elapsedTime.

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> Don't worry. Running our ERP system in a virtual machine will be just as fast a real

  • machine. You won't even know.
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balderdash !

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Go to John Harlow's talk "Guidelines for OpenEdge in a Virtual Environment" Lots of good advice at the VMware technical white papers site: http://www.vmware.com/vmtn/resources/ also http://www.vmware.com/support/pubs/

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> after-imaging journalling has too much overhead performance will suffer

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balderdash !

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> after-imaging journalling is too hard to implement

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"that's not right. it's not even wrong !"

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Go to Paul Koufali's talk "No More AIXcuses" next. He will show you how easy it is.

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> Tupac is alive !

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> Never use variable size extents for after-imaging because they are slower than snails.

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balderdash !

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> It was working great until I fixed it.

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The 8 fallacies of distributed computing

Peter Deutsch Essentially everyone, when they first build a distributed application, makes the following eight assumptions. All prove to be false in the long run and all cause big trouble and painful learning experiences.

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The 8 fallacies of distributed computing

Peter Deutsch 7) The network is reliable

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The 8 fallacies of distributed computing

Peter Deutsch 7) The network is reliable 6) Latency is zero

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The 8 fallacies of distributed computing

Peter Deutsch 7) The network is reliable 6) Latency is zero 5) Bandwidth is infinite

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The 8 fallacies of distributed computing

Peter Deutsch 7) The network is reliable 6) Latency is zero 5) Bandwidth is infinite 4) The network is secure

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The 8 fallacies of distributed computing

Peter Deutsch 7) The network is reliable 6) Latency is zero 5) Bandwidth is infinite 4) The network is secure 3) Topology doesn't change

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The 8 fallacies of distributed computing

Peter Deutsch 7) The network is reliable 6) Latency is zero 5) Bandwidth is infinite 4) The network is secure 3) Topology doesn't change 2) There is one administator

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The 8 fallacies of distributed computing

Peter Deutsch 7) The network is reliable 6) Latency is zero 5) Bandwidth is infinite 4) The network is secure 3) Topology doesn't change 2) There is one administator 1) Transport cost is zero

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The 8 fallacies of distributed computing

Peter Deutsch 7) The network is reliable 6) Latency is zero 5) Bandwidth is infinite 4) The network is secure 3) Topology doesn't change 2) There is one administator 1) Transport cost is zero 0) The network is homogeneous

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The 8 fallacies of distributed computing

Peter Deutsch 7) The network is reliable 6) Latency is zero 5) Bandwidth is infinite 4) The network is secure 3) Topology doesn't change 2) There is one administator 1) Transport cost is zero 0) The network is homogeneous

  • 1)

I didn't change anything

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train wreck is in your future

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Where do we get good advice then?

  • Get a second opinion
  • Test it yourself
  • Join the PEG:

http://www.peg.com

  • Join PSDN:

http://communities.progress.com

  • Tech support knowlege base
  • Conferences
  • Conference sponsors
  • JOIN YOUR LOCAL USER GROUP !!!
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Questions