PARALLEL PROCESSING DATABASE TREE STRUCTURE

摘要

Database system comprising nodes configured in a tree structure is disclosed. The system includes a shared metadata store on the root node. Child nodes may request metadata from their ancestors. Parents will forward the request upward until the metadata is found or the root node is reached.

主权项

1. A method for executing queries in a parallel processing database system, comprising:
receiving a query at a master node, the master node comprising a database catalog including metadata; deriving a plurality of query plans based at least in part on the query; transmitting, to a plurality of worker nodes, corresponding ones of the plurality of query plans and associated query metadata, wherein the query metadata includes information used in connection with executing the query plans; and in the event that additional metadata is needed in connection with executing one of the plurality of query plans, receiving a request for additional metadata corresponding to the query plan for which additional metadata is needed.