Project: „Development of a GOOSY-PAW Successor System“
Minutes of the 10th Meeting on October 05, 1998
Participants: R. Barth, H. Essel, H. Göringer, R. Holzmann, P. Koczon, I. Koenig, W. Koenig,
C. Kozhuharov, P. Malzacher, W.F.J. Müller, M. Richter
Distribution: H. Brand, P. Braun-Munzinger, W. Brüchle, S. Glückert, N. Herrmann, S. Hofmann,
M. Kaspar, H. J. Kluge, U. Krause, N. Kurz, U. Lynen, V. Metag, G. Münzenberg,
V. Schaa, C. Scheidenberger, C. Schlegel, K. Schmidt, K.H. Schmidt, H. J. Specht,
R. Steiner, E. Stiel, K. Sümmerer, H. Winter,
Juha Äyastö (Jyväskylä), G. Bollen (ISOLDE), R. Fox (MSU), E. Grosse (FZR),
Th. Nilsson (ISOLDE), M. Schlett (FZR), H. Simon (ISOLDE), K. Suzuki (Niigata),
Ken Teh (ANL), Piet Van Duppen (Louvain-la-Neuve)
1. Ilse Koenig: Use of Oracle Data Base in HADES Analysis
All details of the HADES experiment, the detector set-up, the data acquisition, the trigger system, and
the analysis can be found under: http://hades.gsi.de/, http://depc14.gsi.de/hadesora/ and
http://www.e12.physik.tu-muenchen.de/hades/.
The motivation of using a relational data base for HADES are:
about 100,000 read-out channels each with at least 2 parameters
calibration parameters
geometry information
cabling
slow control parameters
run information
specific parameter sets for the analysis and for the digitalization of simulated data
keeping track of several parameter versions
Since Oracle is the standard data base at GSI it was chosen as the HADES data base, too. The data base
is normalized so that entries in the data base are unique and unambiguous. The structure is not equal to
the object structures of the analysis or simulation.
For the geometry of HADES the following classification is used:
detector RICH: 1 module
detector MDC: 4 * 6 modules
detector TOF: 22 * 6 modules
detector Shower: 3 * 6 modules
support structures
targets
magnet
The modules in the 6 sectors are identical but each has its individual position and status. Therefore about
800 volume elements are stored.
Parameters of a volume element are:
name
GEANT shape
shape dependent number of 3 D points
coordinate system
medium
name of the "mother volume element"
The access to the data base is through SQL (Structured Query Language) either interactively or via program calls. Interactive tools are:
SQL*PLUS: the Oracle SQL interpreter for line mode interaction
Oracle browser: a GUI based interactive browser
WWW tool: M. Dahlinger, GSI created a Java based data base browser
(http://depc14.gsi.de/hadesora/asphades/intro.htm)
Program calls are using either embedded SQL for pre-compilers of C or C++ or the ODBC (Open Data
Base Connectivity) interface. The ODBC interface allows applications to access data in DBMS (Database management systems) using SQL. It is not bound to a specific vendor DB, because at runtime the
required driver modules are dynamically loaded.
Access rights are available similar to the UNIX user file system.
The analysis parameters of HADES are also stored in the Oracle data base. Through the analysis based
on ROOT these parameters can be stored/retrieved to/from Oracle, ROOT files, or ASCII files. This
allows to work with a local copy of the parameters and provides fast I/O. ROOT or text files can be distributed easily. When a parameter set has been proven, it is stored in the Oracle DB. In ROOT the parameters are organized in a run time DB (containers) and controlled by an administrator class.
A version schema allows to identify the parameter sets used to analyze a data file. Several versions of
parameter sets may be valid, i.e. night and day sets.
2. Next meetings:
Thursday, October 8, 1998, 14:00
K. Schmidt: Experiments at the FRS
Tuesday, October 20, 1998, 09:30, Seminarraum Theorie
K. Rehlich, DESY: DOOCS, an Object-Oriented Control System for TTF (TESLA Test Facility)
M. Richter, H. Essel, October 5, 1998