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About Indexes. Indexes are optional structures associated with tables and clusters that allow SQL statements to execute more quickly against a table. Just as the index in this manual helps you locate information faster than if there were no index, an Oracle Database index provides a faster access path to table data.
1 Graph stores are used to store information about networks, such as social connections. 2  Graph stores include Neo4J and HyperGraphDB. 3  Key-value stores are the simplest NoSQL databases. 4  Every single item in the database is stored as an attribute name (or key), together with its value. Graph stores include Neo4J and HyperGraphDB. 2  Key-value stores are the simplest NoSQL databases. 3  Every single item in the database is stored as an attribute name (or key), together with its value.