Online Databases General Functions Database Categories Tools Conditions & Configurations DB Technical Issues Activities of Interest & Need R. Jeff Porter 2/1/99 STAR Collaboration Meeting

General Functions Organize & preserve Star Online Data Data source/sink in Online Systems –for Subsystem setup, monitoring, and summary tasks Data source to Offline Systems –for calibration and analysis tasks

Online Database Categories Message Log of Online Processes Run Log summaries Configuration DB for SubSystems Conditions DB for SubSystems Scalers Event Tags (TagDB)

Database Tools ASCII Logs for Online Message archival –flexible output for debugging or production –searchable via key fields (e.g. severity level) Objectivity/DB for Data & Summaries –Commercial OODB w/ C++ API –BaBar-Objectivity Software –STAR-flavored BaBar Conditions DB API

Conditions DB Description Database store of the experimental running conditions. Database Access Data relevance spans many events Storage & retrieval by timestamp Update Frequency pre-determined updates (e.g. ~hourly snap-shot) alarm activated update (reactive recording of individual data object) Data Volume moderate per update (~Mbyte) moderately large in aggregate (>~Gbytes)

STAR-BaBar Conditions DB 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) is on time-Interval objects –Separate Index for each “Group-Obj” Conditions Data DBs –Mix of “Group-Obj”s per Database (file)

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

Configurations DB Description Database store of the experimental setup Database Access Data relevance spans many events Storage & retrieval by activation-timestamp &/or by “Key/Name” Update Frequency Bulk data & Referential “Key”: when new data objects are registered Referential “Name”: when a unique configuration is registered Referential “timestamp”: when configuration is activated Data Volume moderate per bulk-data update (<Mbyte) moderate in aggregate (<Gbytes)

STAR Configurations DB DB-Set per SubSystem (tpc, svt, emc, … ) –2 or 3 Index DB + Many Configurations Data DBs (files) Time-interval Index DB & Configurations Data DBs –Based on Conditions DB Implementation Keyed Index –Key Object for each data grouping (“Group-Obj”) instance –Index on Key objects ; Separate Index for each “Group-Obj” SubSystem Named Configuration Index –Named objects contain reference to complete configuration –Allows loading an entire subsystem by configuration name

Configurations DB Design

RunLog DB Begin Run Time/Date End Run Time/Date Run Number Run Period Run Category Run Title List of run comments List of file names with tags Clock Wise (CW) beam descriptor Counter Clock Wise (CCW) beam descriptor RHIC machine Descriptor Star Detector Configuration Reference Quality Tag See Online web pages for more design details

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 Offline & Online Partitions – Use Separate Offline & Online Federations + 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

Activities of General Interest Calibration & Database Issues –Presentations following this section –Bi-weekly Calibration Meetings Needed Tutorials for Online DataBase Users –Access to DB data with Online Infrastructure –Database Developers Workshop