IBM 000-8697 Manual Do Utilizador

Installation and Initial Configuration

CKPTINTVL

 specifies the maximum interval, expressed in seconds, that can

elapse before OnLine checks to determine if a checkpoint is needed. The
default value for

CKPTINTVL

 is 300 seconds, or five minutes.

DB-M

onitor does not prompt for this value during initialization. You can tune

this parameter to affect performance. Refer to

.

LRUS

specifies the number of

LRU

(least recently used) queues in the shared-

memory buffer pool. The role of the

LRU

 queues is described on

.

The default value for

LRUS

is the larger of

USERS

/2 or 8, where

USERS

is the

value of the configuration parameter.

DB-M

onitor does not prompt for this

value during initialization. You can tune this parameter to affect perfor-
mance. Refer to

.

LRU_MAX_DIRTY

 specifies the percentage of modified pages in the

LRU

queues that, when reached, flags the queue to be cleaned. The interaction
between the page-cleaner daemon processes and the

LRU

queues is described

on

The default value for

LRU_MAX_DIRTY

 is 60 percent.

DB-M

onitor does not prompt for this value during initialization. You can tune

this parameter to affect performance. Refer to

.

LRU_MIN_DIRTY

 specifies the percentage of modified pages in the

LRU

queues that, when reached, flags the page cleaners that cleaning is no longer
mandatory. Page cleaners might continue cleaning beyond this point under
some circumstances. The interaction between the page-cleaner daemon
processes and the

LRU

 queues is described on

.

The default value for

LRU_MAX_DIRTY

 is 50 percent.