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dblink_is_busy — checks if connection is busy with an async query
dblink_is_busy(text connname) returns int
dblink_is_busy tests whether an async query is in progress.
connnameName of the connection to check.
Returns 1 if connection is busy, 0 if it is not busy. If this function returns 0, it is guaranteed that dblink_get_result will not block.
SELECT dblink_is_busy('dtest1');
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