各位大佬，在平时数据仓库开发中经常用到/*+ parallel(4)*/，也看到/*+ parallel(表名，4)*/这种指定表名的并行度写法，请问在什么情况用前者什么情况用后者？
并行度这个4或者8是根据CPU的内核个数来定的吗？？多谢
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