Greenplum
MPP (Massively Parallel Processing) data warehouse built as PostgreSQL fork. EMC-acquired 2010, Pivotal spinoff, VMware 2019, Broadcom 2023. Open source since 2015. Competitor: Teradata, Vertica, Snowflake.
Architecture: shared-nothing — master coordinator + multiple segment nodes, each with own storage. Query split over segments. Standard PG SQL syntax + analytics extensions. Use: bank, telecom data warehouse (terabytes-petabytes), healthcare analytics. Modern alternative: cloud-native (Snowflake, BigQuery, Redshift) takes market share. Greenplum lives on for on-prem + sovereignty-sensitive deployments. Broadcom acquisition worries — Pivotal products have history of paywall move after ownership change.