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Is parallel query execution in Postgresql supported for SELECT INTO queries?
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No. Parallel execution is not available for DDL statements - only for read only queries.
The deprecated
SELECT .. INTO ...creates a new table and thus it qualifies as DDL.It is also recommended to use
CREATE TABLE .. AS SELECT ...instead.Update: Postgres 11 (to be released end of 2018) will support parallel query execution for
CREATE TABLE ... AS SELECT ...