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bdb supports diffs...

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Sears Russell 2005-03-25 22:50:05 +00:00
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doc/paper2/LLADD.tex
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@ -1733,8 +1733,8 @@ significantly better than Berkeley DB's with both filesystems.}
%more of \yad's internal APIs. Our choice of C as an implementation %more of \yad's internal APIs. Our choice of C as an implementation
%language complicates this task somewhat.} %language complicates this task somewhat.}
\rcs{Is the graph for the next paragraph worth the space?} %\rcs{Is the graph for the next paragraph worth the space?}
\eab{I can combine them onto one graph I think (not 2).} %\eab{I can combine them onto one graph I think (not 2).}
% %
%The final test measures the maximum number of sustainable transactions %The final test measures the maximum number of sustainable transactions
%per second for the two libraries. In these cases, we generate a %per second for the two libraries. In these cases, we generate a
@ -1761,8 +1761,10 @@ general purpose structures when applied to an appropriate application.
This finding suggests that it is appropriate for This finding suggests that it is appropriate for
application developers to consider the development of custom application developers to consider the development of custom
transactional storage mechanisms when application performance is transactional storage mechanisms when application performance is
important. The next two sections are devoted to developing such mechanisms, important. The next two sections are devoted to confirming the
confirming their practicality. practicality of such mechanisms by applying them to applications
that suffer from long-standing performance problems with layered
transactional systems.
%This section uses: %This section uses:
@ -1876,7 +1878,10 @@ memory pressure.}
to object serialization. First, since \yad supports to object serialization. First, since \yad supports
custom log entries, it is trivial to have it store deltas to custom log entries, it is trivial to have it store deltas to
the log instead of writing the entire object during an update. the log instead of writing the entire object during an update.
Such an optimization would be difficult to achieve with Berkeley DB, Such an optimization would be difficult to achieve with Berkeley DB
since its record diffing mechanism assumes that changes span contiguous
byte ranges, and this may not be the case for arbitrary object updates.
\rcs { MIKE IMPLEMENTED THIS! FIXME }
but could be performed by a database server if the fields of the but could be performed by a database server if the fields of the
objects were broken into database table columns. objects were broken into database table columns.
\footnote{It is unclear if \footnote{It is unclear if