Aerospike key-value store (KVS) operations associate keys with a set of named values. On cluster startup, Aerospike configures policy containers—namespaces (RDBMS databases)—which control the retention and reliability requirements for a set of data. Namespaces are divided into sets (RDBMS tables) and records (RDBMS rows). Each record has a unique indexed key, and one or more bins (RDBMS columns) that contain the record values. Aerospike supports numerous data types used for bin values, as arguments, and as UDF return values. Aerospike allows value-based queries using secondary indexes, where string and integer bin values are indexed and searched using equality (string or numeric) or range (numeric) filters. User-Defined Functions (UDFs) extend the functionality and performance capabilities of the Aerospike Database engine. In Aerospike, the aggregations framework allows fast, flexible query operations. Similar to MapReduce systems, aggregation emits results in a highly parallel fashion. Aerospike supports large data types (LDTs) that allow individual record bins to efficiently store large collections of elements. In Aeropike, you can use list data types when dealing with a size-bound list residing in a single bin. List operations allow server manipulation (such as adding or removing an item) without having to read and replace the entire bin value. Aerospike supports Geospatial store, index, and query.

* Rich API - HyperDex provides one of the richest APIs in the NoSQL space. Its support for datatypes is unparalleled by other sharded data stores. It supports bulk asynchronous operations. And it boasts the fastest, consistent, online backups in the industry. * Consistency - HyperDex provides the strongest consistency properties of any open-source NoSQL system. Specifically, HyperDex guarantees that key operations are linearizable A client will always GET the value of the latest PUT. * Fault Tolerance - HyperDex ensures that data is replicated to withstand failures. This fault-tolerance threshold can be customized to an application's needs. The system guarantees seamless operation and automatic failover. * ACID Transactions - HyperDex Warp, a commercial extension to HyperDex, combines NoSQL performance with ACID transactions. Lightweight protocols underneath the covers ensure that this functionality comes with a minimal performance penalty. HyperDex Warp, with its ACID guarantees, is 2-10X faster than Mongo, and only 2% slower than HyperDex without ACID guarantees. * Performance - HyperDex is the fastest NoSQL system on the market, outperforming Mongo by 2-10X. Performance benchmarks provide the details.