Novell EDIRECTORY 8.8 SP3, Руководство администратора, Страница: 539 / 634

Maintaining Novell eDirectory 539
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When eDirectory adjusts its cache limit, there is 16 MB of available physical memory. eDirectory
calculates a new limit of 12 MB. eDirectory checks to see whether the new limit falls within the
range of minimum and maximum thresholds. In this example, the maximum threshold requires that
10 MB must remain available, so eDirectory sets the limit to 6 MB. However, the minimum
threshold is 8 MB, so eDirectory sets the final limit to 8 MB.
With the dynamically adjusting limit, you also specify the interval length. The default interval is 15
seconds. The shorter the interval, the more the memory consumption is based on current conditions.
However, shorter intervals are not necessarily better because the percentage recalculation will create
more memory allocation and freeing.
Understanding the Hard Memory Limit
The hard memory limit is the method that earlier versions of eDirectory use to regulate memory
consumption. You set a hard memory limit in one of the following ways:
Š
Fixed number of bytes
Š
Percentage of physical memory
The percentage of physical memory at the interval becomes a fixed number of bytes.
Š
Percentage of available physical memory
The percentage of available physical memory at the interval becomes a fixed number of bytes.
Cleaning Up the Cache
NDS 8 creates multiple versions of blocks and entries in its cache for transaction integrity purposes.
Earlier versions of NDS 8 did not remove these blocks and entries when they were no longer
needed. In eDirectory 8.8, a background process periodically browses the cache and cleans out older
versions. This helps minimize cache memory consumption. The default browsing interval is 15
seconds.
Configuring Dynamically Adjusting and Hard Memory Limits
You can configure dynamically adjusting and hard memory limits in either of the following
methods:
Š
“Using Novell iMonitor” on page 539
Š “Using the _ndsdb.ini File” on page 541
Using Novell iMonitor
1 Click Agent Configuration Description: Agent Configuration button .
2 Click Database Cache , then view the following information:
Percentage of available physical
memory to use:
75
Maximum threshold: Keep 10 MB available