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MariaDB Xpand is a distributed SQL database with high availability, fault tolerance, and write scaling:
MariaDB Xpand supports ACID-compliant distributed SQL for modern web applications with massive workloads that require high performance and strong consistency, such as online transactional processing (OLTP).
MariaDB Xpand can adapt to changes in workload or capacity requirements with elastic scale-out and scale-in. When more capacity is required, more Xpand nodes can be added. When workload is reduced, Xpand nodes can be removed.
MariaDB Xpand provides efficient execution of complex queries (such as JOINs and aggregation operations) using parallel query execution.
MariaDB Xpand 6.0 adds support for Columnar indexes. Columnar indexes can improve the performance of workloads that can't benefit from row-based indexes, such as ad-hoc queries and operational analytics. Xpand can use row-based indexes and Columnar indexes on the same table, allowing these other workloads to be performed alongside a traditional OLTP workload.
MariaDB Xpand can be deployed in the cloud on MariaDB SkySQL, or on-premises.
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MariaDB Documentation provides information regarding MariaDB Xpand (Distributed SQL).