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Amazon ElastiCache
User Guide (API Version 2015-02-02)

Cache Parameter Group Tiers

Amazon ElastiCache has three tiers of cache parameter groups as illustrated here.

Image: Amazon ElastiCache parameter group tiers

Amazon ElastiCache parameter group tiers

Global Default

The top-level root parameter group for all Amazon ElastiCache customers in the region.

The global default cache parameter group:

  • Is reserved for ElastiCache and not available to the customer.

Customer Default

A copy of the Global Default cache parameter group which is created for the customer's use.

The Customer Default cache parameter group:

  • Is created and owned by ElastiCache.

  • Is available to the customer for use as a cache parameter group for any clusters running an engine version supported by this cache parameter group. For example, default.redis2.8 supports Redis engine versions 2.8.x.

  • Cannot be edited by the customer.

Customer Owned

A copy of the Customer Default cache parameter group. A Customer Owned cache parameter group is created whenever the customer creates a cache parameter group.

The Customer Owned cache parameter group:

  • Is created and owned by the customer.

  • Can be assigned to any of the customer's compatible clusters. For example, a cache parameter group created with the family redis2.8 is compatible with any cluster running Redis 2.8.x.

  • Can be modified by the customer to create a custom cache parameter group. ‡

    ‡ Not all parameter values can be modified. For more information, see either Memcached Specific Parameters or Redis Specific Parameters.