nsslapd-db-home-directory

- database file location

Description

Used to fix a situation where the operating system endlessly flushes pages. This flushing can be so excessive that performance of the entire system is severely degraded.

This situation will occur only for certain combinations of the database cache size, the size of physical memory, and kernel tuning attributes. In particular, this situation should not occur if the database cache size is less than 100 MB.

For example, if your Solaris host seems excessively slow and your database cache size is around 100 MB or more, then you can use the iostat utility to diagnose the problem. Use iostat to monitor the activity of the disk where the Directory Server database files are stored. If all of the following conditions are true, then you can use the nsslapd-db-home-directory attribute to specify a subdirectory of a tempfs type file system.

• The disk is heavily used, more than 1 MB per second of data transfer.

• Service time is long, more than 100 ms.

• There is mostly write activity.

Entry DN

cn=config,cn=ldbm database,cn=plugins,cn=config

Valid Range

Any valid directory name in a tempfs file system, such as /tmp.

Default Value

Not applicable

Syntax

DirectoryString

Example

nsslapd-db-home-directory: /tmp/ds1-db

Attributes

See attributes(5) for descriptions of the following attributes:

See Also

dse.ldif(4)