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Infrastructure Access to Database Data

This document outlines the development tasks and considerations for creating an offline access framework to the Objectivity database for database consumers. It discusses various components such as the access model, data structures, and the integration of online and offline infrastructures. Technical issues related to platform dependencies and data management strategies for efficient offline access are also highlighted. Additionally, the document emphasizes the need for standardized input formats and user tutorials to enhance the user experience for offline database users.

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Infrastructure Access to Database Data

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  1. Infrastructure Access to Database Data Database Categories & Consumers Data Access Framework Offline Access Model Development Tasks R. Jeff Porter 2/1/99 STAR Collaboration Meeting

  2. Database Categories & Consumers DB-TypeDB-ConsumerDB-store MessageLog Online ASCII RunLog Online+Offline Objy & ASCII Configurations/DB Online Objy & ASCII Conditions/DB Online+Offline Objy Scalers Offline Objy Event Tags (TagDB) Offline Objy + Root Calibrations Offline Objy & ASCII Geometry Offline Objy & ASCII

  3. DB Consumers (continued)

  4. DB Access Considerations • Primary Repository >> Objectivity • Objectivity will not be exposed to (consumer) codes • Online & Offline Infrastructures differ Offline >> StRoot framework Online >> C++ & CORBA (no Root I/O) • Online & Offline require use of an ASCII Repository - editor-friendly format for filling DB data - backup while Objectivity/DB is being developed - test bed for non-Objectivity code development

  5. DB Access Support

  6. Access Model for Offline StMaker & St_DataSet form basis for Offline Infrastructure St_db_Maker (Victor) • Reads RootCINT Macro store of data into St_DataSet’s transient tree • St_Table: inherits from St_DataSet & contains “Char_t* s_table” • St_[staf_table] inherits from St_Table & supports return [staf_table]* St_Odb_Maker • Calls Database Access code (database factory) & recieves StDbObject for input into St_DataSet’s transient tree. • St_DBSet: inherits from St_DataSet & contains “StDbObject* s_db” • St_[dbo] inherits from St_DBSet & supports return [dbo_UI]*

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

  8. Access from Conditions DB Objectivity Data Access StDbObject* dbo = StDbFactory->GetDBInfo( NamedObject, theTime,...) • Deconvolutes NamedObject into specific Objectivity Objects: ObjH1, ObjH2,… • Retrieves Objectivity data • BdbDatabase->fetch(ObjH1,indexContainer, theTime,...) • BdbDatabase->fetch(ObjH2,indexContainer, theTime,...) … • Makes Transient Data from Objectivity data • StDbObject->setData(ObjH1->getData()) • StDbObject->setData(ObjH2->getData()) • Returns Transient Data StDbObject Transient tree structure is not part of persistent data Returned StDbObject supports UserInterface

  9. Technical Issues Platform Dependencies • Objectivity: Solaris, Win-95/NT, Linux, HP-UX, AIX, IRIX, DEC-Unix • BaBar-Objectivity: Solaris, HP-UX, AIX, DEC-Unix • STAR Offline: Solaris, Linux • Use of Objectivity Database will Not be fully exercised in MDC2 but restricted to testing on Solaris machines

  10. Development Tasks Tasks beyond Objectivity Database storage • Finish design & implement Offline access to Objectivity • Use current TPC DB-data as prototype for other domains • Design standardized Database input formats • develop Database-data viewers Needed Tutorials for Offline DataBase Users • Access to DB data with Offline Infrastructure • Database Developers Workshop

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