Red Hat DIRECTORY SERVER 8.0, Руководство администратора

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Chapter 4.
95
Populating Directory Databases
Databases contain the directory data managed by the Red Hat Directory Server.
4.1. Importing Data
Directory Server can populate a database with data in one of two ways: by importing data (either
through the Directory Server Console or using the import tools) or by initializing a database for
replication.
Table 4.1, “Import Method Comparison”
describes the differences between an import and initializing
databases.
Action Import Initialize Database
Overwrites database No Yes
LDAP operations Add, modify, delete Add only
Performance More time-consuming Fast
Partition specialty Works on all partitions Local partitions only
Response to server failure Best effort (all changes made
up to the point of the failure
remain) Atomic (all changes are lost
after a failure)
LDIF file location Local to Console Local to Console or local to
server
Imports configuration
information (
cn=config
)
Yes No
Table 4.1. Import Method Comparison
4.1.1. Importing Entries with Large Attributes
The
nsslapd-cachememsize
attribute defines the size allowed for the entry cache.
The import buffer is automatically set to 80% of the cache memory size setting. If the memory cache is
1GB, for example, then the import buffer is 800MB.
When importing a very large database or entries with large attributes (often with values like binary data
like certificate chains, CRLs, or images), then set the
nsslapd-cachememsize
attribute high enough
so that the import buffer has enough memory to process the entries.
4.1.2. Importing a Database from the Console
When performing an import operation from the Directory Server Console, an
ldapmodify
operation
is executed to append data, as well as to modify and delete entries. The operation is performed on all
of the databases managed by the Directory Server and on remote databases to which the Directory
Server has a configured database link.
You must be logged in as the Directory Manager in order to perform an import.