Database Cache Information Table; Table 12-6 Database Performance Monitoring - Database Cache Information - Netscape DIRECTORY SERVER 6.1 - ADMINISTRATOR Administrator's Manual

Database Performance Monitoring - Summary Information (Continued)
Table 12-5
Performance Metric
Maximum entry cache
size (in bytes)
Current entry cache
size (in entries)
Maximum entry cache
size (in entries)

Database Cache Information Table

The Database Cache Information table provides caching information listed in
Table 12-6.
Table 12-6 Database Performance Monitoring - Database Cache Information
Performance Metric
Hits
Tries
Hit ratio
Pages read in
Pages written out
Current Total
Indicates the size of the entry cache maintained by the directory. This value is
managed by the "Maximum Cache Size" attribute. See "Tuning Database
Performance," on page 432 for information on changing this value using the
Server Console.
Indicates the total number of directory entries currently present in the entry
cache.
Indicates the maximum number of directory entries that can be maintained in the
entry cache. This value is managed by the "Maximum Entries in Cache" attribute.
See "Tuning Database Performance," on page 432 for information on changing
this value using the Server Console.
Current Total
Indicates the number of times the database cache successfully supplied a
requested page. A page is a buffer of the size 2K.
Indicates the number of times the database cache was asked for a page.
Indicates 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 appropriate database page. Thus, as
this ratio drops towards zero, the number of disk accesses increases and
directory performance drops.
To improve this ratio, you can increase the amount of data that the directory
maintains in the database cache by increasing the value of the "Maximum
Cache Size" attribute. See "Tuning Database Performance," on page 432 for
information on changing this value using the Server Console.
Indicates the number of pages read from disk into the database cache.
Indicates the number of pages written from the cache back to disk. A database
page is written to disk whenever a read-write page has been modified and
then subsequently deleted from the cache. Pages are deleted from the database
cache when the cache is full and a directory operation requires a database page
that is not currently stored in cache.
Chapter 12 Monitoring Server and Database Activity
Monitoring Database Activity
413