The following table lists the basic concepts involved in HybridDB for PostgreSQL.

Term Description
Group The operation unit in HybridDB for PostgreSQL.
  • A HybridDB for PostgreSQL instance is composed of multiple groups.
  • Increasing the number of groups can improve the linear performance.
Group type The package of computing resources available.
  • Each group type includes CPU, I/O, memory, and disk resources. Different group types have different performance.
  • Resources in one group are allocated to the same physical host.
Number of groups The number of purchased groups.
  • The minimum unit is two.
  • Each group type has different group number limit.
MPP Massively Parallel Processing, a distributed Shared Nothing computing architecture. MPP improves the performance by parallel computing of multiple shared-nothing nodes (known as groups in HybridDB for PostgreSQL).