IBM 000-8697 Manual Do Utilizador

Operating OnLine

If you are logged in as user informix, you can create a dbspace within

DB-M

onitor or from the command line. If you are logged in as root, you must

use the command-line option.

From within

DB-M

onitor, select the Parameters menu, Shared-

Memory option to change the shared-memory residency setting. A
value of

Y

 enforces shared memory, and a value of

N

 permits all or

part of shared memory to be swapped to disk. Change the value in
the field,

Forced Residency,

 to either

Y

 or

N

.

Reinitialize shared memory (take OnLine offline and then to
quiescent mode) for the change to take effect.

To change the value of

 RESIDENT

 from the command line, use an

editor to edit the file specified by $

. A

value of 1 enforces shared memory and a value of 0 permits all or
part of shared memory to be swapped to disk.

Change the value of

 RESIDENT

to either 1 or 0. Reinitialize shared

memory (take OnLine offline and then to quiescent mode) for the
change to take effect.

Two status changes are possible:

■

Change a mirrored chunk from online to down

■

Change a mirrored chunk from down to recovery

The status of a chunk is described by a combination of flags.

You can take down or restore a chunk only if it is part of a mirrored pair. You
can take down or restore either the primary chunk or the mirror chunk, as
long as the other chunk in the pair is online.