The Sybase Server 
A Sybase server consists of: 
       a) Two processes, data server and backup server.
       b) Devices which house the databases; one database 
(master) contains system and configuration data.
       c) A configuration file which contains the server 
attributes. 
Memory Model 
The Sybase memory model consists of: 
	a) The program area, which is where the dataserver 
executable is stored.
	b) The data cache, stores recently fetched pages 
from the database device. 
	c) The stored procedure cache, which contains 
optimized sql calls. 
A database device stores the objects that make up 
databases. 
	The term device does not necessarily refer to a 
distinct physical device: it can refer to any piece of a 
disk (such as a disk partition) or a file in the file 
system that is used to store databases and their objects.

Each database device or file must be prepared and made 
known to Adaptive Server before it can be used for database 
storage. This process is called initialization.
A segment is a label that points to one or more database 
devices. When you first create a database, Adaptive Server 
creates three segments in the database,

System: Stores the database?s system tables.
Logsegment: Stores the database?s transaction log.
Default: Stores all other database objects?unless you 
create additional segments and store tables or indexes on 
the new segments by using create table...on segment_name or 
create index...on segment_name