Why ODBMS ?

  • OO programming paradigm

    • is the modern, industry direction
    • supported by C++, Java high level languages
    • excellent choice of both free and commercial class libraries
    • suits our problem space well: rich hierarchy of complex data types (raw data, tracks, energy clusters, particles, missing energy, time-dependent calibration constants)
    • Allows us to take full advantage of industry developments in software technology
  • Need to make some objects “persistent”

    • raw data
    • newly computed, useful, objects
  • Need an object store that supports an evolving data model and scales to many PetaBytes (1015 Bytes)

    • (O)RDBMS wont work: For one year’s data would need a virtual table with 109 rows and many columns
  • Require persistent heterogeneous object location transparency, replication

    • Multiple platforms, arrays of software versions, many applications, widely distributed in collaboration
    • Need to banish huge “logbooks” of correspondences between event numbers, run numbers, event types, tag information, file names, tape numbers, site names etc.

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