Speaker
Dr
Douglas Smith
(STANFORD LINEAR ACCELERATOR CENTER)
Description
For the BaBar Computing Group:
Two years ago, the BaBar experiment changed its event store from an object oriented
database system, to one based on ROOT files. A new bookkeeping system was developed
to manage the meta-data of these files. This system has been in constant use since
that time, and has successfully provided the needed meta-data information for users'
analysis jobs, data management, and data distribution. This meta-data is stored in
distributed databases, which can be hosted at any BaBar computing site, using either
Oracle or MySQL. The system has performed well with the increasing data volume from
all production efforts, and ever-growing number of analysis and production sites that
host their own mirrors of the databases. Meta-data driven data export to computing
sites throughout our distributed collaboration will also be discussed. Code developed
for this system has also been shown to work well for other tasks within BaBar, and
common-use tools will be described. The system still performs well after years of
use, and should work fine and scale for the life of the experiment. The use and
experience of this system within BaBar will be discussed, along with recent
developments to make things better.
Primary author
Dr
Douglas Smith
(STANFORD LINEAR ACCELERATOR CENTER)
Co-authors
Dr
Tim Adye
(Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, United Kingdom.)
Dr
Wilhelm Roethel
(UC, IRVINE)
