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Migrating to Sybase Adaptive Server Enterprise 11.5 6-13

Adaptive Server Enterprise 11.5 If Your Current Version is 4.x, 10.x or 11.0.x

Space in your machine’s physical memory (RAM) is apportioned

roughly as depicted in Figure 6-1.

Figure 6-1: Areas of memory

The areas and their functions are:

Operating system. This part of the physical space is used by the

operating system and other non-Sybase processes running on the

machine.

Shared memory. This is rest of the physical memory, which is

allocated to Adaptive Server by the operating system.

Server processes and structures. This area includes the

dataserver

program and the server kernel, which manages Adaptive Server.

This area also includes space for structures like locks and user

connections. These processes and structures take as much of the

shared memory as they need.

Procedure cache. This area is used by compiled objects that execute,

such as stored procedures, triggers, and views. Procedure cache

grabs a set percentage (the

procedure cache percent set by sp_conﬁgure) of

the remaining shared memory.

Data cache. This area is where pages of data are kept in memory. In

general, the more data pages that are kept in memory, the less disk

Operating System

Server Processes

Procedure Cache

Data Cache

Server Executable

and Structures

Shared

Memory

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Seagate ST43401N/ND Informazioni Techniche Pagina 93