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Changing the Database Checkpoint Interval
•
Disabling Durable Transactions
•
Specifying Transaction Batching
Optimizing Search Performance
You can improve server performance on searches by tuning database settings. The
database attributes that affect performance mainly define the amount of memory
available to the server.
To improve the cache hit ratio on search operations, you can increase the amount of
data that the directory server maintains in the database cache. Do this by increasing
the number of entries stored in the cache, and by increasing the cache size. The
maximum values that you can set for these attributes depends on the amount of
real memory on your machine. Roughly, the amount of available memory on your
machine should always be greater than:
(Maximum Entries in Cache + Maximum Cache Size) x average entry size
Use caution when changing these two attributes. Your ability to improve server
performance with these attributes depends on the size of your database, the
amount of physical memory available on your machine, and whether directory
searches are random (that is, if your directory clients are searching for random and
widely scattered directory data).
If your database does not fit into memory and if searches are random , attempting
to increase the values set on these attributes does not help directory performance.
In fact, changing these attributes may harm overall performance.
You can tune the following attributes:
•
The attributes of the database that manages all other database instances. In
Directory Server Console, you can see only the databases that contain your
directory data, and the
another database to manage these. On this database, you can change the
following attributes to improve performance:
The amount of memory that you want to make available for all databases
(maximum cache size attribute)
The maximum number of entries you want the server to verify in response
to a search request (look-through limit attribute)
database. However, the server uses
NetscapeRoot
Chapter 14
Tuning Database Performance
Tuning Directory Server Performance
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