PX Deq Credit: send blkd

This is a place holder for "PX Deq Credit: send blkd" wait event.  It will be expanded later with more information.
1 PX Deq Credit: send blkd - wait for what?
2 PX Deq Credit: send blkd caused by IDE (SQL Developer, Toad, PL/SQL Developer)
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8 Using Oracle's Parallel Execution Features
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