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STAR Conditions DatabaseSTAR Conditions Database What is it? Tools Conditions DB API Beyond Conditions Technical Issues Activities of General Interest
R. Jeff Porter 1/31/98 STAR Collaboration Meeting
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What Is It? Two definitions - at least that I useInformal: Database for storing the experimental
conditions that existed during data taking. Formal: A specific (STAR-BaBar-Objectivity)
database API used to store and access conditions data.
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What Is It? (continued)The informal (task) definition sets criteria that the formal (technical) definition needs to meet.
Database Access • Data valid over many events • Data access by time-stamp query
Update Frequency • pre-determined updates (e.g. ~hourly system wide snap-shots)• alarm activated updates (of individual data-objects)
Data Volume • moderate per update (~Mbyte) • moderately large in aggregate (~Gbytes)
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Tools Objectivity/DB
– Commercial Object Oriented DateBase w/ C++ API
BaBar Objectivity Software– “production” quality Objectivity Database Design &
Implementation
BaBar Conditions DB API– Specific Objectivity implementation for conditions data
STAR Conditions DB API– STAR specific implementation of BaBar Conditions DB
(e.g. tpc, svt, emc, …)
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Tools (continued) BaBar Packages STAR ExtensionsBaBar/BdbAccess/BdbApplication/BdbClustering/ StBdbInterface/BdbCond/ StOdbCond/ >> ConditionsDBBdbEvent/ StOdbEvent/BdbEventStore/BdbTools/BdbUtil/ StUtil/
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BaBar Conditions DB APIDB-Set per SubSystem (tpc, svt, emc, … )
– One Index DB (file) + Many Conditions Data DBs (files)
Index DB– time-Interval object for each data grouping (“Group-Obj”) instance – Index (+ Versioning) on the time-Interval objects – Separate Index for each “Group-Obj”
Conditions Data DBs– Mix of “Group-Obj”s per Database (file)
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BaBar Conditions DB API
Data Access– BdbDatabase->store( ObjH, indexContainer, beginTime, [endTime],...)– BdbDatabase->fetch( ObjH, indexContainer, theTime,...)
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sysCondDB
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GroupObj-IndexD t1, D t2, D t3,
..., D tN
Beyond ConditionsWhile the (Formal) Conditions DB solves a specific Database task, it is applicable to many other “time-indexed” Database types needed by STAR.
Conditions DB (measured values)Configuration DB (set values)Calibration/Geometry DB
There will be additional access routes (e.g. via “Keyed” or “named” reference) but the base support of the time-stamp access will be via the Conditions DB API.
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Technical Issues All Objectivity database access is by Federation
– tightly couples Online & Offline development– single point vulnerability
• Lockserver & BOOT file & Federation file
• Limit vulnerability – Use Objectivity Autonomous Partitions for Offline & Online– Separate Online & Offline Federations with Data-Replication
Platform Dependencies– Objectivity: Solaris, Win-95/NT, Linux, HP-UX, AIX, IRIX, DEC-Unix– BaBar-Objectivity: Solaris, HP-UX, AIX, DEC-Unix– STAR Online: Solaris, Windows-NT– STAR Offline: Solaris, Linux
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Activities of General InterestCalibration & Database Issues
– Tomorrow’s presentations– Bi-weekly Calibration Meetings ([email protected])
Needed Tutorials for DataBase Users – Access to DB data with Offline Infrastructure– Access to DB data with Online Infrastructure– Database Developers Workshop
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