eXo Platform 4.0 Documentation > Reference Guide / eXo JCR > Configuration > Advanced configuration > Query Handler configuration > Indexing in clustered environment
2.2.3.1.1. Standalone index

Standalone strategy provides a stack of indexes to achieve greater performance within single JVM.

It combines in-memory buffer index directory with delayed file-system flushing. This index is called "Volatile" and it is invoked in searches also. Within some conditions volatile index is flushed to the persistent storage (file system) as new index directory. This allows to achieve great results for write operations.

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