what is the architechure of sybase ASE?

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