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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
Ode
An Object-Oriented Database from AT&T which extends C++
and supports fast queries, complex application modelling and
multimedia.
Ode uses one integrated data model (C++ classes) for both
database and general purpose manipulation. An Ode database is
a collection of persistent objects. It is defined,
queried and manipulated using the language O++. O++
programs can be compiled with C++ programs, thus allowing the
use of existing C++ code. O++ provides facilities for
specifying transactions, creating and manipulating persistent
objects, querying the database and creating and manipulating
versions.
The Ode object database provides four object compatible
mechanisms for manipulating and querying the database. As
well as O++ there are OdeView - an X Window System
interface; OdeFS (a file system interface allowing objects to
be treated and manipulated like normal Unix files); and CQL++,
a C++ variant of SQL for easing the transition from
relational databases to OODBs such as Ode.
Ode supports large objects (critical for multimedia
applications). Ode tracks the relationship between versions
of objects and provides facilities for accessing different
versions. Transactions can be specified as read-only; such
transactions are faster because they are not logged and they
are less likely to deadlock. 'Hypothetical' transactions
allow users to pose "what-if" scenarios (as with
spreadsheets).
EOS, the storage engine of Ode, is based on a client-server
architecture. EOS supports concurrency based on
multi-granularity two-version two-phase locking; it allows
many readers and one writer to access the same item
simultaneously. Standard two-phase locking is also available.
Ode supports both a client-server mode for multiple users
with concurrent access and a single user mode giving improved
performance.
Ode 3.0 is currently being used as the multimedia {database
engine} for AT&T's Interactive TV project. Ode 2.0 has
also been distributed to more than 80 sites within AT&T and
more than 340 universities. Ode is available free to
universities under a non-disclosure agreement. The current
version, 3.0, is available only for Sun SPARCstations
running SunOS 4.1.3 and Solaris 2.3. Ode is being ported
to Microsoft Windows NT, Windows 95 and SGI
platforms.
E-mail: Narain Gehani