Amazon Redshift parameter groups - Amazon Redshift

Amazon Redshift parameter groups

In Amazon Redshift, you associate a parameter group with each cluster that you create. A parameter group is a group of parameters that apply to all of the databases that you create in the cluster. These parameters configure database settings such as query timeout and date style. When you launch a cluster, you must associate it with a parameter group. If you want to change the parameter group later, you can modify the cluster and choose a different parameter group.

Each parameter group has several parameters to configure settings for the database. The list of available parameters depends on the parameter group family to which the parameter group belongs. The parameter group family is the version of the Amazon Redshift engine to which the parameters in the parameter group apply. The format of the parameter group family name is redshift-version where version is the engine version. For example, the current version of the engine is redshift-1.0.

Amazon Redshift provides one default parameter group for each parameter group family. The default parameter group has preset values for each of its parameters, and it cannot be modified. The format of the default parameter group name is default.parameter_group_family, where parameter_group_family is the version of the engine to which the parameter group belongs. For example, the default parameter group for the redshift-1.0 version is named default.redshift-1.0.

Note

At this time, redshift-1.0 is the only version of the Amazon Redshift engine. Consequently, default.redshift-1.0 is the only default parameter group.

If you want to use different parameter values than the default parameter group, you must create a custom parameter group and then associate your cluster with it. Initially, the parameter values in a custom parameter group are the same as in the default parameter group. The initial source for all of the parameters is engine-default because the values are preset by Amazon Redshift. After you change a parameter value, the source changes to user to indicate that the value has been modified from its default value.

Note

The Amazon Redshift console does not display the source of each parameter. You must use the Amazon Redshift API, the AWS CLI, or one of the AWS SDKs to view the source.

For parameter groups that you create, you can modify a parameter value at any time, or you can reset all parameter values to their defaults. You can also associate a different parameter group with a cluster. In some cases, you might modify parameter values in a parameter group that is already associated with a cluster or associate a different parameter group with a cluster. In these cases, you might need to restart the cluster for the updated parameter values to take effect. If the cluster fails and is restarted by Amazon Redshift, your changes are applied at that time. Changes aren't applied if your cluster is restarted during maintenance. For more information, see WLM dynamic and static properties.

Default parameter values

The following table shows the default parameter values at a glance with links to more in-depth information about each parameter. These are the default values for the redshift-1.0 parameter group family.

Parameter name Value More information

auto_analyze

true

auto_analyze in the Amazon Redshift Database Developer Guide

auto_mv

true

Automated materialized views in the Amazon Redshift Database Developer Guide

datestyle

ISO, MDY

datestyle in the Amazon Redshift Database Developer Guide

enable_case_sensitive_identifier

false

enable_case_sensitive_identifier in the Amazon Redshift Database Developer Guide

enable_user_activity_logging

false

Database audit logging in this guide

extra_float_digits

0

extra_float_digits in the Amazon Redshift Database Developer Guide

max_concurrency_scaling_clusters

1

max_concurrency_scaling_clusters in the Amazon Redshift Database Developer Guide

query_group

default

query_group in the Amazon Redshift Database Developer Guide

require_ssl

false

Configuring security options for connections in this guide

search_path

$user, public

search_path in the Amazon Redshift Database Developer Guide

statement_timeout

0

statement_timeout in the Amazon Redshift Database Developer Guide

wlm_json_configuration

[{"auto_wlm":true}]

Workload management in this guide

use_fips_ssl

false

Enable FIPS-compliant SSL mode only if your system is required to be FIPS-compliant.

Note

The max_cursor_result_set_size parameter is deprecated. For more information about cursor result set size, see Cursor constraints in the Amazon Redshift Database Developer Guide.

You can temporarily override a parameter by using the SET command in the database. The SET command overrides the parameter for the duration of your current session only. In addition to the parameters listed in the preceding table, you can also temporarily adjust the slot count by setting wlm_query_slot_count in the database. The wlm_query_slot_count parameter is not available for configuration in parameter groups. For more information about adjusting the slot count, see wlm_query_slot_count in the Amazon Redshift Database Developer Guide. For more information about temporarily overriding the other parameters, see Modifying the server configuration in the Amazon Redshift Database Developer Guide.