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STAR Conditions Database

STAR 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. What Is It?. Two definitions - at least that I use

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STAR Conditions Database

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  1. STAR 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

  2. What Is It? Two definitions - at least that I use Informal: 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.

  3. 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)

  4. 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, …)

  5. Tools (continued) BaBar PackagesSTAR Extensions BaBar/ BdbAccess/ BdbApplication/ BdbClustering/ StBdbInterface/ BdbCond/ StOdbCond/ >>ConditionsDB BdbEvent/ StOdbEvent/ BdbEventStore/ BdbTools/ BdbUtil/ StUtil/

  6. BaBar Conditions DB API DB-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)

  7. BaBar Conditions DB API Data Access • BdbDatabase->store( ObjH, indexContainer, beginTime, [endTime],...) • BdbDatabase->fetch( ObjH, indexContainer, theTime,...)

  8. Beyond Conditions While 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.

  9. 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

  10. Activities of General Interest Calibration & Database Issues • Tomorrow’s presentations • Bi-weekly Calibration Meetings (starcalib-l@bnl.gov) 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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