In message <[EMAIL PROTECTED]>, doug chanco
<[EMAIL PROTECTED]> writes
hey all,
I have "heard" bad things about using dynamic files versus
hashed/static ones. Can anyone share any thoughts on which is better
(in particular on a system where the files grow at a fairly steady rate).
The "bad" things may date from the early days of UV. I never heard
anything bad about the INFORMATION implementation, but the rumour was
VMark were very keen to buy PI to fix the bugs in their own
implementation.
I always understood that dynamic files were best on files that did not
change "that much that fast " as the constant need to resize would
outweigh the manual effort of resizing the files manually (or with a
program).
I think you've got that arse about face, actually. Static files are best
where they don't change that fast, because you can optimise the
algorithm to the data. Dynamic files are supposedly best for files that
either (a) grow indefinitely, or (b) are very volatile.
The cost of resizing a dynamic file is actually very small.
I am looking for insight (or where to find some insight) on universe
and best file practices (right now I am reading the system description
manual and its helping but lacks insights that I am sure some of the
old pickies on here have)
For files that "just grow", use dynamic.
For files that are volatile, use dynamic (and consider setting a
MINIMUM.MODULUS based on their typical size).
For files that don't change much, use dynamic (why bother worrying about
sizing it accurately, when dynamic files will do a pretty good job
anyway).
Note that, by default, UV is not very aggressive at shrinking files so
the chances are a "not very volatile" file will almost never be resized.
Cheers,
Wol
--
Anthony W. Youngman <[EMAIL PROTECTED]>
'Yings, yow graley yin! Suz ae rikt dheu,' said the blue man, taking the
thimble. 'What *is* he?' said Magrat. 'They're gnomes,' said Nanny. The man
lowered the thimble. 'Pictsies!' Carpe Jugulum, Terry Pratchett 1998
Visit the MaVerick web-site - <http://www.maverick-dbms.org> Open Source Pick
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