Although you can set the NOLOGGING attribute for a table, index, or tablespace, Nologging mode only applies to a few operations on the object for which the attribute is set, such as:
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CREATE TABLE ... AS SELECT
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CREATE INDEX
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ALTER INDEX ... REBUILD
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DIRECT PATH INSERT
The following statements are nevertheless unaffected by the NOLOGGING attribute: UPDATE, DELETE, conventional path INSERT, and various DDL statements not listed above.
即使你在table,index,tablespace上设置了nologging属性，但对于update,delete,conventional path INSERT以及上述没有提到的ddl语句都不会受nologging属性影响。
比如你的表是nologging的，但你做insert插入，也是有redo log entries产生的。你可以自己试试看，insert,update,delete都是可以rollback的。
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