Red Hat DIRECTORY SERVER 8.0, Руководство администратора

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Chapter 13. Monitoring Server and Database Activity
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Performance Metric Current Total
Entry Cache Hit Ratio Ratio that indicates the number of entry cache
tries to successful entry cache lookups. This
number is based on the total lookups and hits
since the directory was last started. The closer
this value is to 100%, the better. Whenever a
search operation attempts to find an entry that
is not present in the entry cache, the directory
has to perform a disk access to obtain the
entry. Thus, as this ratio drops towards zero,
the number of disk accesses increases, and
directory search performance drops. To improve
this ratio, increase the number of entries that
the directory maintains in the entry cache by
increasing the value of the
Maximum Entries
in Cache
attribute. See
Section 15.2, “Tuning
Database Performance”
for information on
changing this value using the Directory Server
Console.
Current Entry Cache Size (in Bytes) The total size of directory entries currently
present in the entry cache.
Maximum Entry Cache Size (in Bytes) The size of the entry cache maintained by
the directory. This value is managed by the
Maximum Cache Size
setting. See
Section 15.2,
“Tuning Database Performance”
for information
on changing this value using the Directory Server
Console.
Current Entry Cache Size (in Entries) The total number of directory entries currently
present in the entry cache.
Maximum Entry Cache Size (in Entries) The maximum number of directory entries that
can be maintained in the entry cache. This value
is managed by the
Maximum Entries in Cache
setting. See
Section 15.2, “Tuning Database
Performance”
for information on changing this
value using the Directory Server Console.
Table 13.8. Summary Information
Performance Metric Current Total
Hits The number of times the database cache
successfully supplied a requested page. A page
is a buffer of the size 2K.
Tries The number of times the database cache was
asked for a page.
Hit Ratio The ratio of database cache hits to database
cache tries. The closer this value is to 100%,
the better. Whenever a directory operation
attempts to find a portion of the database that is
not present in the database cache, the directory
has to perform a disk access to obtain the