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The COPY command is the standard PostgreSQL non-parallel data loading tool.
Greenplum Database offers the standard PostgreSQL COPY command for loading and unloading data. COPY is a non-parallel load/unload mechanism: data is loaded/unloaded in a single process using the Greenplum master database instance. For small amounts of data, COPY offers a simple way to move data into or out of a database in a single transaction, without the administrative overhead of setting up an external table.