Red Hat DIRECTORY SERVER 8.0 Command Reference Manual page 133

Parameter
Example
3.4.1.17. nsslapd-db-transaction-batch-val
This attribute specifies how many transactions will be batched before being committed. This attribute
can improve update performance when full transaction durability is not required. This attribute can be
dynamically modified using ldapmodify. For further information on modifying this attribute, refer to
the "Tuning Directory Server Performance" chapter in the Directory Server Administrator's Guide.
WARNING
Setting this value will reduce data consistency and may lead to loss of data. This is
because if there is a power outage before the server can flush the batched transactions,
those transactions in the batch will be lost.
Do not set this value unless specifically requested to do so by Red Hat support.
If this attribute is not defined or is set to a value of 0, transaction batching will be turned off, and it will
be impossible to make remote modifications to this attribute via LDAP. However, setting this attribute
to a value greater than 0 causes the server to delay committing transactions until the number of
queued transactions is equal to the attribute value. A value greater than 0 also allows modififications
to this attribute remotely via LDAP. A value of 1 for this attribute allows modifications to the attribute
setting remotely via LDAP, but results in no batching behavior. A value of 1 at server startup is
therefore useful for maintaining normal durability while also allowing transaction batching to be turned
on and off remotely when desired. Remember that the value for this attribute may require modifying
the nsslapd-db-logbuf-size attribute to ensure sufficient log buffer size for accommodating the
batched transactions.
NOTE
The nsslapd-db-transaction-batch-val attribute is only valid if the nsslapd-db-
durable-transaction attribute is set to on.
For more information on database transaction logging, refer to the "Monitoring Server and Database
Activity" chapter in the Directory Server Administrator's Guide.
Parameter
Entry DN
Valid Range
Default Value
Syntax
Example
Database Attributes under cn=config, cn=ldbm database, cn=plugins, cn=config
Description
nsslapd-db-spin-count: 0
Description
cn=config, cn=ldbm database, cn=plugins,
cn=config
0 to 30
0 (or turned off)
Integer
nsslapd-db-transaction-batch-val: 5
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