Red Hat 8.1 - Manual (Page 128)

database (the ldif2db operation).
In Directory Server, the import operation can be run as a server task or exclusively on the command-line.
In the task mode, the import operation runs as a general Directory Server operation. The nsslapd-
import-cache-autosize attribute enables the import cache to be set automatically to a predetermined
size when the import operation is run on the command-line. The attribute can also be used by Directory
Server during the task mode import for allocating a specified percentage of free memory for import
cache.
By default, the nsslapd-import-cache-autosize attribute is enabled and is set to a value of -1. This
value autosizes the import cache for the ldif2db operation only, automatically allocating fifty percent
(50%) of the free physical memory for the import cache. The percentage value (50%) is hard-coded and
cannot be changed.
Setting the attribute value to 50 (nsslapd-import-cache-autosize: 50) has the same effect on
performance during an ldif2db operation. However, such a setting will have the same effect on
performance when the import operation is run as a Directory Server task. The -1 value autosizes the
import cache just for the ldif2db operation and not for any, including import, general Directory Server
tasks.
NOTE
The purpose of a -1 setting is to enable the ldif2db operation to benefit from free physical
memory but, at the same time, not compete for valuable memory with the entry cache, which is
used for general operations of the Directory Server.
Setting the nsslapd-import-cache-autosize attribute value to 0 turns off the import cache autosizing
feature - that is, no autosizing occurs during either mode of the import operation. Instead, Directory
Server uses the nsslapd-import-cachesize attribute for import cache size, with a default value of
20000000.
There are three caches in the context of Directory Server: database cache, entry cache, and import
cache. The import cache is only used during the import operation. The nsslapd-cache-autosize
attribute, which is used for autosizing the entry cache and database cache, is used during the Directory
Server operations only and not during the ldif2db command-line operation; the attribute value is the
percentage of free physical memory to be allocated for the entry cache and database cache.
If both the autosizing attributes, nsslapd-cache-autosize and nsslapd-import-cache-autosize,
are enabled, ensure that their sum is less than 100.
Parameter Description
Entry DN cn=config, cn=ldbm database, cn=plugins,
cn=config
Valid Range -1, 0 (turns import cache autosizing off) to 100
Default Value -1 (turns import cache autosizing on for ldif2db
only and allocates 50% of the free physical
memory to import cache)
Syntax Integer
Example nsslapd-import-cache-autosize: -1
3.4 .1.24 . nsslapd-mode
This attribute specifies the permissions used for newly created index files.
Parameter Description
Entry DN cn=config, cn=ldbm database, cn=plugins,
cn=config
Valid Values Any four-digit octal number. However, mode 0600
is recommended. This allows read and write
access for the owner of the index files (which is
the user as whom the ns-slapd runs) and no
access for other users.
Default Value 600
Syntax Integer
Example nsslapd-mode: 0600
3.4 .2. Database Attributes under cn=monitor, cn=ldbm database, cn=plugins, cn=config
Global read-only attributes containing database statistics for monitoring activity on the databases are
stored in the cn=monitor, cn=ldbm database, cn=plugins, cn=config tree node. For more
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Chapter 3. Plug-in Implemented Server Functionality Reference