controls::set maximum connection limits
Overview
The max_connections
parameter indicates the maximum number of client connections allowed per database partition. It is recommended that this parameter be set equal to the max_coordagents
parameter. The max_coordagents
parameter equals the maximum number of agents needed to perform connections to the database or attachments to the instance. NOTE: Ensure that dependent parameters, such as maxappls, are set less than the max_coordagents
parameter. This would ensure that the lock limit isn’t reached, which would result in lock escalation issues.
Rationale:
By default, DB2 allows an unlimited number of users to access the DB2 instance. In addition to giving access to the DB2 instance to authorized users only, it is recommended to set a limit to the number of users allowed to access a DB2 instance. This helps prevent denial of service conditions should an authorized process malfunction and attempt a large number of simultaneous connections.
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Benchmarks
This control is used in the following benchmarks:
- DB2 Database 10 CIS V1.1.0 - paragraph 3.1.11
Skipping
To deliberately skip this control (e.g. meaning don’t use Puppet to enforce this setting), we provide you with three ways:
1) Add db2_secured::controls::set_maximum_connection_limits: skip
to your hiera data. This will skip this control for ALL databases.
2) Add db2_secured::controls::set_maximum_connection_limits::instance_name::dbname: skip
to your hiera data. This will skip this control for specified database only.
3) Add an entry with the content set_maximum_connection_limits
to the array value db2_secured::skip_list
in your hiera data.
Attributes
Attribute Name | Short Description |
---|---|
title | The database identifier to apply the control to. |
title
The database identifier to apply the control to.
All controls need an database identifier to apply the control to. Here is a simple example:
db2_secured::controls::control_name { 'db2inst1/MYDB':}
In this example, the string dbinst1
is the instance, the string MYDB
is the database to apply the control to.