Bucardo vs NineData

Bucardo is a free, open-source system for asynchronous PostgreSQL replication in multi-source and multi-target arrangements. It supports multi-way synchronization and one-direction master-standby replication. Users define named syncs that copy selected tables between a server and other servers. A Perl daemon listens for NOTIFY requests and connects to remote databases to copy data. Multi-source setups can use a standard conflict handler or a custom handler assigned per table. Configuration and replication databases require PostgreSQL 8.1 or later, while the configuration database also needs PL/pgSQL and PL/PerlU. The daemon needs a Unix-like operating system, is tested mainly on Linux and macOS, and does not run natively on Windows. Installation is available from source, RPM or Debian packages, and FreeBSD Ports. Bucardo does not replicate DDL or schema changes. The listed latest release is 5.6.0.

NineData is a platform for database DevOps, replication, comparison, and AI-assisted data management. Database DevOps covers SQL standards review, approval workflows, automated release and rollback, archiving, and change tracking. Replication handles homogeneous and heterogeneous sources, cross-region synchronization, and cross-cloud or cross-environment migration. Data Comparison supports full, sampling-based, feature-column, and incremental checks, with repair SQL and DDL script generation. AI functions include slow SQL optimization, natural-language SQL generation, and support for multiple large language models. Supported sources include MySQL, PostgreSQL, Oracle, SQL Server, MongoDB, Redis, Milvus, ClickHouse, Doris, StarRocks, Hive, MaxCompute, and other listed systems. Deployment includes on-premise Community, managed SaaS, and private-environment Enterprise. Community is free forever and allows up to 10 data sources and 10 replication tasks. SaaS Data Replication costs $30 a month, billed by task volume and specifications. SaaS Data DevOps costs $1,000 a month on the same basis.