What is ObjectStore?

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What is ObjectStore?

• Object-Oriented Database System
• High performance, reliable, scalable, and highly
  available
• Tightly integrated with Java and C

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ObjectStore Architecture

• Flexible client/server architecture
• Cache-Forward
• Data stored on client in memory
• Only request from server upon page-faults
• callback locking to ensure data integrity and
  transaction consistency
• Three main processes
• Server, Client, Cache Manager

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Server Process Responsibilities

• Storage and retrieval of persistent data
• Arbitration of concurrent access by multiple
  clients (send callback message to Cache Manager)
• Recovery of databases

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Client Process Responsibilities

• Requests the Server to fetch/store data from/in a
  database
• Maintains the cache of recently used pages
• Receives locks and pages from Server

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Cache Manager Process Responsibilities

• Facilitate concurrent access to data by handling
  callback messages from the Server
• Creates client cache

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Data Model

• Direct support for Java or C Objects
• Store objects in their nature representation
• No rows or columns

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Extended Library Interface

• Library based API to support database activities
• os_databasecreate()
• os_databaselookup()
• os_databaseopen()
• New classes in library
• collection, sets, bags, and lists.

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Class and Set Example

• class Employee
• public
• string name
• int age
• float salary
• persistentltdbgt os_SetltEmployee gt employees

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Query Example

• employees salary gt 50000 salary lt 100000
  
• employees salary gt 250000 age gt 60

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Compatibility with RDBMS

• CORBA
• SQL
• JavaBeans
• ODMG
• DCOM
• ANSI
• OQL (Object Query Language)

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Platform Support

• Microsoft Windows NT, Windows 95 and Windows 98
• Sun Solaris
• Hewlett-Packard HP-UX
• Silicon Graphics Irix
• IBM AIX
• Digital UNIX

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Conclusion

• Object-Oriented
• Memory Centric
• Native Object Store
• Transparent API

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References

• C. Lamb, G. Landis, J. Orenstein, and D. Weinreb.
  The ObjectStore Database System. Comm. of the
  ACM, 34(10)50--63, October 1991.
• George Lausen, Gottfried Vossen. Models and
  Languages of Object-Oriented Databases.
  Addison-Wesley, 1997.
• ObjectStore Documentation ObjectStore
  Management. Object Design, Inc. (Part number
  SW-OS-DOC-MGT-510)
• Alfons Kemper, Guido Moerkotte. Object-Oriented
  Database Management. Pretice-Hall, Inc. 1994.
• J. Orenstein, S. Haradhvala, B. Margulies, D.
  Sakahara. Query processing in the ObjectStore
  database system. Proc. of the ACM SIGMOD Conf. on
  Management of Data, pages 403-412, June 1992.
• Object Design, Inc. www.odi.com