LRUS

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LRUS

onconfig.std value

8

if not present

If MULTIPROCESSOR is set: MAX(4, num_cpu_vps)
If MULTIPROCESSOR is not set: 4

units

Number of LRU queues

range of values

1 through 128

takes effect

When the database server is shut down and restarted

utilities

onstat -R (See page onstat -R.)

refer to

The following material:

LRU queues, in the shared-memory chapter of the IBM Informix Dynamic Server Administrator's Guide
Chapter on configuration effects on memory, in your IBM Informix Dynamic Server Performance Guide

Note:

Information that was specified with the LRUS configuration parameter prior to Version 10.0 is now specified using the BUFFERPOOL configuration parameter. For more information, see BUFFERPOOL.

LRUS specifies the number of LRU (least-recently-used) queues in the shared-memory buffer pool. You can tune the value of LRUS, in combination with the LRU_MIN_DIRTY and LRU_MAX_DIRTY parameters, to control how frequently the shared-memory buffers are flushed to disk.

Setting LRUS too high might result in excessive page-cleaner activity.