PX Deq Credit: send blkd
This is an idle event. The process is waiting for a message during a parallel execute.
Detailed Description​
The process wishes to send a message and does not have the flow control credit. Process must first dequeue a message to obtain the credit. This wait event indicates that the receiver has not dequeued and/or completely consumed the prior message yet.
PX Deq Credit: send blkd and PX Deq Credit: need buffer are nearly the same. Due to internal reason, you see PX Deq Credit: send blkd more on local systems and PX Deq Credit: need buffer more on RAC systems.
How to reduce this wait​
Refer to My Oracle Support for the "Master Note for Parallel Execution Wait Events".
Additional Links​
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