# [[guc:max_parallel_workers_per_gather]]

> Maximum parallel workers per Gather/Gather Merge node.
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Maximum parallel workers per Gather/Gather Merge node.

[Official PostgreSQL 18 parameter reference](https://www.postgresql.org/docs/18/runtime-config.html#GUC-MAX-PARALLEL-WORKERS-PER-GATHER)

## Referenced by wait events {#wait-events}

- [LWLock/BufferMapping](/lwlock/buffer-mapping/)