IBM 000-8697 Manuale Utente

Operating OnLine

From within

DB-M

onitor, select the Parameters menu, Shared-

Memory option to change the number of page buffers in the shared-
memory pool. Change the value in the field

Max # of Buffers

.

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

To change the value of

BUFFERS

 from the command line, use an

editor to edit the file specified by $

.

Change the value of

BUFFERS

. Reinitialize shared memory (take

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

This section provides instructions for changing the size of either the three
logical log buffers or the two physical log buffers. Refer to

further information about the physical log buffers. Refer to

 for

further information about the logical log buffers.

The size of each of the three logical log buffers is specified as

LOGBUFF

in the

configuration file. The size of each of the two physical log buffers is specified
as

PHYSBUFF

.

The buffer size is expressed in kilobytes. The recommended value for both
parameters is 16 pages. The minimum value is one page, although small
buffers can create problems if you are storing records that are larger than the
size of the buffers (for example, blobs in dbspaces).

You can make this change while OnLine is in online mode, but it will not take
effect until you reinitialize shared memory (take OnLine offline and then to
quiescent or online mode).

If you are logged in as user informix, you can make this change from within

DB-M

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

use the command-line option.