Dynamic map configuration options

You can create additional maps in a data grid by having your client application connect to the specially-named map. When this connection occurs, the map is automatically created.

Dynamic map naming

When you create a data grid, two maps created by default. The first map is named the same as your data grid. For example, if you create the myGrid data grid, you automatically get a myGrid map. The second map is for the near cache and is named myGrid.NCI. However, you can also add maps to the data grid. A map is automatically created when the client application connects to a map using the following naming convention:

<map_name>.<template>.<locking_option> .<near_cache_invalidation>

where:

map_name (required): Specifies the name of the map.
template (required): Specifies the template that defines when entries expire from the map, by defining the time to live (TTL) behavior. See Map templates for a list of the available options.
locking_option: Specifies the locking mechanism that is used for the map. See Locking options for a list of the available options.
near_cache_invalidation: Specifies if near-cache invalidation is used for the map. Near-cache invalidation is only used when the map has a lock type set to NONE or OPTIMISTIC. You can configure near cache invalidation to remove stale data from the near cache as quickly as possible. When an update, deletion, or invalidation operation is run against the remote data grid, an asynchronous invalidation gets triggered in the near cache See Near-cache invalidation options for a list of the available options.

You must include a template name for the map. If you do not specify a locking option, no locking occurs on the map.

Map templates

Table 1. Dynamic map templates
Map Template	Description
*.NONE	Specifies a map with no time to live (TTL) expiration.
*.LUT	Specifies a map in which the entries are expired based on the last update time of the entry. The default TTL is one hour.
*.LAT	A map in which the entries are expired based on the last access time of the entry. The default TTL is one hour.
*.CT	A map in which the entries are expired based on the of the creation time of the entry plus the TTL value. The default TTL is one hour.

Locking options

Table 2. Dynamic map locking options
Locking Option	Description
(blank)	If you do not indicate a locking option, no locking mechanism is used.
.P	Specifies that the map has pessimistic locking
.O	Specifies that the map has optimistic locking

Near-cache invalidation options

Table 3. Near-cache invalidation options
Locking Option	Description
(blank)	If you do not indicate a value, near-cache invalidation is disabled.
.NCI	Specifies that the map uses near-cache invalidation. Your map must have optimistic or no locking enabled.