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Dokuschablonen 19x24 Version 7.3us für FrameMaker V7.x vom 14.02.2007 © cognitas GmbH 2001-2007
24. Oktober 2007 Stand 08:58.55 Pfad: G:\vogt\fsc\uds\Manuale\en\udsent_e\udsent.k05
5 SSL
5.1 Introduction
The schema DDL is used to describe the logical structure of the data; the Storage Structure
Language SSL is used to specify the physical storage structure when storing data and
logical relationships between data. The definition of the physical storage structure is
optional. If it is omitted, UDS/SQL applies the default values. The user can influence the
storage space requirements for the data and especially the system run-time behavior in
future applications when defining the storage structure.
Designing the storage structure involves the following steps:
1. Declaring the population
2. Defining the linkage of records
3. Determining the placement of member records, tables and hash areas
4. Determining the extent of table reorganization
Each of these steps is dealt with below in a separate section, which also explains the default
cases. These sections are preceded by a description of the methods UDS/SQL uses for the
physical representation of the logical data structure.
The metalanguage used is described on page 22, and the general syntax rules are summa-
rized on page 234.
You compile the SSL using the SSL compiler. For information on operating the SSL
compiler, please refer to the "Creation and Restructuring" manual, Compiling SSL).