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From Apache Wiki <wikidi...@apache.org>
Subject [Db-derby Wiki] Update of "CodingProjects" by KnutAndersHatlen
Date Mon, 09 Feb 2009 09:53:09 GMT
Dear Wiki user,

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The following page has been changed by KnutAndersHatlen:

  || Add support for shared code ||  || Currently it is not possible to safely share code
between Derby jar files.  This proposal would be to identify and implement a mechanism for
sharing code that does not cause issues with compatibility in a mixed version environment
|| An initial attempt to define the ground rules for this can be found at SharedComponentVersioningGuidelines||
1-2 ||
  ||Migration tool from MySQL to Derby|| || || || ||
  ||Server management tools. || ||Tools to manage checkpoints/backups, data and log placement,
lock monitoring, performance monitoring, etc.  Each one of these is its own separate project||
|| ||
- ||More JMX support || ||Build on top of the foundation introduced in 10.4.|| || ||
+ ||More JMX support || ||Build on top of the foundation introduced in 10.4. Examples: Add
monitoring of transaction rate (# of transactions committed/aborted/active), hits/misses in
the page cache, locks, etc. || || ||
  ||Automatic copying of log from the log directory to an archive|| || || || ||
  ||Implement an LRU-based cache manager to replace the current clock algorithm|| || Derby
currently uses a clock algorithm to determine which pages to replace in its page cache. We
have indications that this algorithm is far from optimal for some type of loads.  Many other
database systems use variants of an LRU-based algorithm, i.e. the pages that are least recently
used will be candidates for replacement. || ["LRUCache"] || ||
  ||Network client Quality Improvements|| Kathey Marsden|| Derby introduced the network client
JDBC driver with its release.  There is still important quality work pending to match
the robustness of our embedded Driver.  This is a great opportunity to learn about JDBC, XA,
and DRDA protocol and become active in the Apache Derby development community.||NetworkClientQualityImprovements||??||

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