你在你语句中使用了并行，而并且查询进程被意外中止下面是官方说明： ORA-12805 parallel query server died unexpectedly Cause The PMON process is cleaning up the process because a parallel query server terminated unexpectedly. Action Check for operating system errors and retry the statement. If this problem persists, contact customer support.
ORA-12805 parallel query server died unexpectedly
Cause The PMON process is cleaning up the process because a parallel query server terminated unexpectedly.
Action Check for operating system errors and retry the statement. If this problem persists, contact customer support.
ORA-12805: parallel query server died unexpectedly