IBM 000-8697 Manuale Utente

IBM Informix OnLine Database Server Administrator’s Guide

DBSERVERNAME

specifies a unique name associated with this specific occur-

rence of OnLine. The identifier distinguishes this OnLine server from all
other database servers in the $

 directory and the network, if

one exists.

The value of

DBSERVERNAME

 cannot exceed 18 characters. Valid characters

are restricted to digits, letters, and the underscore. The default value of

DBSERVERNAME

 is

ONLINE

.

This section describes how to assign values to the OnLine shared-memory
parameters.

As part of the initialization procedure,

DB-M

onitor prompts you to enter the

values of all but eight of the shared-memory parameters listed in
tbconfig.std

.

These eight parameters are used to tune performance. Default values are
used during initialization. Tuning is best done later, when you can monitor
and evaluate OnLine performance under typical working conditions. The
eight performance parameters do not appear on the configuration worksheet
but they are described in this section.

The value of

RESIDENT

 indicates whether OnLine shared memory remains

resident in

UNIX

 physical memory. If your

UNIX

 system supports forced

residency, you can specify that OnLine shared memory is not swapped to
disk.

The size of OnLine shared memory is a factor in your decision. Before you
decide on residency, verify that the amount of physical memory available
after satisfying OnLine requirements is sufficient to execute all required

UNIX

and application processes.

The default value of

RESIDENT

in tbconfig.std is 0, indicating that residency

is not enforced. A value of 1 indicates that residency is enforced.