|
The Omnidex Environment Catalog is a superset of schemas,
characterizing one or more environments in a single file.
At the same time, it is a subset of the information within
those schemas, describing only the information pertinent to
the application. It organizes data into a system of defined
objects that you can access and manipulate through Omnidex
applications, and defines the relationships between those
objects and any native indexing structures available for data
retrieval.
An Environment Catalog is divided into several sections,
each of which defines a different aspect of the environment.
Within each of these sections are statements that define some
object, like a DATABASE, TABLE or COLUMN in the Environment.
These statements declare a name for the object, as well as
certain attributes, like the DATATYPE and LENGTH of a column.
In a flat-file environment, the fundamental objects are files
and rows, and their organization is solely a function of the
application programs that access them.
The following is a simple example Environment source file:
Environment start_env
 Database
start
Type
flatfile
table sales_facts
column
odx_seq_ID datatype INTEGER length 2
column
acct datatype CHAR length 10
column
amount datatype INTEGER length 4
The Environment Catalog source files are created using any
system text editor. Alternatively, for Oracle, Sybase, Informix,
and TurboImage, the Environment Catalogs can be automatically
generated through the Omnidex utility OAHELPER.
The Omnidex utility OACOMP
is used to compile the Environment source file into the Environment
object file, also called the compiled Environment Catalog
file. If the original Environment source file is needed but
unavailable, the Omnidex utility OADECOMP
will create a separate Environment source file from an existing
compiled Environment file.
top
|
