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3.3. Cache Modes and Storing Indexes

3.3.1. Storing Lucene Indexes
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In Red Hat JBoss Data Grid's Query Module, Lucene is used to store and manage indexes. Lucene ships with several index storage subsystems, also known as directories.
These include directories for the purpose of:
  • simple, in-memory storage.
  • file system storage.
To configure the storage of indexes, set the appropriate properties when enabling indexing in the JBoss Data Grid configuration.
The following example demonstrates an in-memory, RAM-based index store: 
<namedCache name="indexesInMemory">
	<indexing enabled="true">
		<properties>
			<property name="default.directory_provider" value="ram"/>
		</properties>
	</indexing>
</namedCache>
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This second example shows a disk-based index store: 
<namedCache name="indexesOnDisk">
	<indexing enabled="true">
		<properties>
			<property name="default.directory_provider" value="filesystem"/>
		</properties>
	</indexing>
</namedCache>
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