Red Hat DIRECTORY SERVER 8.0, Administration Manual

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Advanced Feature: Tuning Database Link Performance
75
The connection management attributes specified in this entry take precedence over the attributes
specified in the
cn=default instance config
entry.
Attribute Name Description
nsOperationConnectionsLimit Maximum number of LDAP connections that
the database link establishes with the remote
server. The default value is
20
connections per
database link instance.
nsBindConnectionsLimit Maximum number of TCP connections that the
database link establishes with the remote server.
The default value is
3
connections.
nsConcurrentOperationsLimit Maximum number of outstanding operations
per LDAP connection. The default value is
2
operations per connection.
nsConcurrentBindLimit Maximum number of outstanding bind operations
per TCP connection. The default value is
10
outstanding bind operations.
nsBindRetryLimit Number of times a database link attempts to
bind to the remote server. A value of zero (
0
)
indicates that the database link will try to bind
only once. The default value is
3
attempts.
nsConnectionLife Connection lifetime, in seconds. Connections
between the database link and the remote
server can be kept open for an unspecified
time or closed after a specific period of time.
It is faster to keep the connections open, but
it uses more resources. For example, it may
be wise to limit the connection time for a slow
connection. A value of
0
indicates there is no
limit. By default, the value is set to
0
. When the
value is
0
and there is a list of failover servers in
the
nsFarmServerURL
attribute, the first server
is never contacted after failover to the alternate
server. The default value is
0
seconds.
nsBindTimeout Amount of time, in seconds, before the bind
attempt times out. The default value is
15
seconds.
nsAbandonedSearchCheckInterval Number of seconds that pass before the server
checks for abandoned operations. The default
value is
1
second.
Table 3.5. Database Link Connection Management Attributes
For the list of database link configuration attributes, see
Table 3.4, “Database Link Configuration
Attributes”
.
3.3.6.2. Detecting Errors During Normal Processing
Protect server performance by detecting errors during the normal chaining operation between the
database link and the remote server. The database link has two attributes —
nsMaxResponseDelay