User guide

Data Integration with Sybase Avaki Studio 183
metadata model
A construct in Avaki Studio that expresses a schema by defining a set of tables. A table in a metadata
model can be mapped (linked) to an Avaki object such as a data service or a database operation, or to
a table in a relational database. The mapping lets you address each mapped object by the name of the
corresponding table in the metadata model. You can also derive a view model schema from a metadata
model. When you do this, you ensure that the results of any data service deployed from the view
model will conform to the metadata model’s schema.
NFS client
A machine that mounts the Avaki data catalog (or a portion of it) as a directory by connecting to an
Avaki data grid access server. An NFS client need not have Avaki software installed. (NFS—Network
File System—lets you add file systems located on a remote computer to the directory structure on
your own computer.)
ODBC
ODBC (Open DataBase Connectivity) is an API for databases on Windows. An ODBC driver (such as
the the Sybase Organic ODBC driver included with Sybase ASE) allows Avaki to communicate with
Windows database applications.
on-demand caching
A scheme by which an object is cached only if it’s used—for example, results are cached when a
database operation or a data service is executed, or a file is cached when a user or application reads
it. On-demand caching uses a fixed expiration interval to determine data freshness. On-demand cach-
ing is suitable for objects that are rarely accessed or that change at irregular intervals. Contrast with
scheduled caching.
pin
To mark an Avaki directory or file for scheduled caching. See also cache service.
plug-in
See data service plug-in.
primary GDC
See grid domain controller.
proxy server
An Avaki server that allows Avaki domains on opposite sides of a firewall or a Network Address
Translator (NAT) to communicate with one another.