Service manual

107
Chapter 6
Tuning Cache Sizes
Directory Server caches directory information in memory and on disk in order to
be able to respond more quickly to client requests. Properly tuned caching
minimizes the need to access disk subsystems when handling client requests.
Types of Cache
Directory Server handles three types of cache as described in Table 6-1.
Directory Server also benefits from file system cache, handled by the underlying
operating system, and from I/O buffers in disk subsystems.
NOTE Unless caches are tuned and working properly, other tuning may
have only limited impact on performance.
Table 6-1 Caches
Cache Type Description
Database Each Directory Server instance has one database cache that
holds both indexes and entries in database format.
Entry Each suffix has an entry cache that holds entries retrieved
from the database during previous operations and formatted
for quick delivery to client applications.
Import Each Directory Server instance has an import cache that is
structurally similar to the database cache and is used during
bulk loading.