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Monitoring Database Activity
Chapter
12
Monitoring Server and Database Activity
413
Database Cache Information Table
The Database Cache Information table provides caching information listed in
Table 12-6.
Maximum entry cache
size (in bytes)
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.
Current entry cache
size (in entries)
Indicates the total number of directory entries currently present in the entry
cache.
Maximum entry cache
size (in entries)
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.
Table 12-6
Database Performance Monitoring - Database Cache Information
Performance Metric
Current Total
Hits
Indicates the number of times the database cache successfully supplied a
requested page. A page is a buffer of the size 2K.
Tries
Indicates the number of times the database cache was asked for a page.
Hit ratio
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.
Pages read in
Indicates the number of pages read from disk into the database cache.
Pages written out
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.
Table 12-5
Database Performance Monitoring - Summary Information (Continued)
Performance Metric
Current Total
Содержание NETSCAPE DIRECTORY SERVER 6.1 - ADMINISTRATOR
Страница 1: ...Administrator s Guide Netscape Directory Server Version6 1 August 2002...
Страница 20: ...20 Netscape Directory Server Administrator s Guide August 2002...
Страница 24: ...24 Netscape Directory Server Administrator s Guide August 2002...
Страница 44: ...Starting the Server in Referral Mode 44 Netscape Directory Server Administrator s Guide August 2002...
Страница 78: ...Maintaining Referential Integrity 78 Netscape Directory Server Administrator s Guide August 2002...
Страница 142: ...Using Referrals 142 Netscape Directory Server Administrator s Guide August 2002...
Страница 162: ...Enabling and Disabling Read Only Mode 162 Netscape Directory Server Administrator s Guide August 2002...
Страница 278: ...Setting Resource Limits Based on the Bind DN 278 Netscape Directory Server Administrator s Guide August 2002...
Страница 336: ...Troubleshooting Replication Related Problems 336 Netscape Directory Server Administrator s Guide August 2002...
Страница 396: ...Configuring LDAP Clients to Use SSL 396 Netscape Directory Server Administrator s Guide August 2002...
Страница 418: ...Monitoring Database Link Activity 418 Netscape Directory Server Administrator s Guide August 2002...
Страница 440: ...Miscellaneous Tuning Tips 440 Netscape Directory Server Administrator s Guide August 2002...
Страница 442: ...442 Netscape Directory Server Administrator s Guide August 2002...
Страница 478: ...PTA Plug In Syntax Examples 478 Netscape Directory Server Administrator s Guide August 2002...
Страница 498: ...498 Netscape Directory Server Administrator s Guide August 2002...
Страница 512: ...Storing Information in Multiple Languages 512 Netscape Directory Server Administrator s Guide August 2002...
Страница 532: ...Searching an Internationalized Directory 532 Netscape Directory Server Administrator s Guide August 2002...
Страница 538: ...Examples of LDAP URLs 538 Netscape Directory Server Administrator s Guide August 2002...