The Design of the BABAR
Conditions Database

David R. Quarrie

Information and Computing Sciences Division
Lawrence Berkeley National Laboratory

Version Information

Draft: 26th March 1997

This document is still under development. If you have any questions or comments, please address them to the author.

Table of Contents

• Introduction
• Directory & File Organization
• References

Introduction

This document describes the global design of the BABAR Conditions Database, which is a component of the BABARDatabase Management System(BDMS). It introduces the concepts and terminology that describe the components of the system, together with some design guidelines.

The BABAR Event Store is a domain of the BDMS, having the domain name conditions.

Directory & File Organization

Directory Tree

$BDBROOT/ -+- conditions/ -+- tla[i]/ -+- tla[i]Index.bdb
                           |           |
                           |           +- tla[i]0000/ -+- tla[i]00000.bdb
                           |           |               |
                           |           |               +- tla[i]00001.bdb
                           |           |               |
                           |           |               +- [...]
                           |           |
                           |           +- tla[i]0001/ -+- tla[i]00100.bdb
                           |           |               |
                           |           |               +- [...]
                           |           +- [...]
                           |
                           +- tla[j]/ -+- tla[j]Index.bdb
                           |           |
                           |           +- tla[j]0000/ -+- tla[j]00000.bdb
                           |           |               |
                           |           |               +- [...]
                           |           +- [...]
                           |
                           +- [...]

Database File Details

conditions:

Data files
    Name: tlaNNNNN.bdb
        tla Three Letter Accronym (lowercase)
        NNNNN   Automatically generated sequence number [5 digit decimal]
        All conditions data within one container
    Length: Fixed length [how long - adjustable for now]

    Interval File:
    Name: tlaIndex.bdb
        tla Three Letter Accronym (lowercase)
        One Container per Classname/key
    Length: Variable

[might want to change NNNNN to be the same as for events directory tree]

References

1. Object Database Management Group, The Object Database Management Group Standard, 1993
2. ATLAS Collaboration, ATLAS Computing Technical Proposal, CERN/LHCC 96-43, Dec1996.

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