MessageQueueSend
Waiting to send bytes to a shared message queue.
Additional Information​
MessageQueueSend is in the Inter Process Communication (IPC) wait class. In this case the wait is to receive bytes from a message queue. Message queues provide an asynchronous communication protocol in which the sender and receiver of messages don't need to interact at the same time - messages are held in a queue until the recipient retrieves them. Amongst other places, MessageQueue* waits are seen in parallel query co-ordination.
How to reduce this wait​
In a database with Shared Message Queues set up, it will be normal to see this wait state.
Additional Links​
PostgreSQL documentation - The Statistics Collector
PostgreSQL docs - Wait Events of Type IPC
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