如果该属性被设为true，则JPOX将根据jd o元数据对数据库表进行验证(在我们的例子中，package . jdo是元数据文件的文件名)，这样会稍微降低性能。

If this is set to true, JPOX validates the database tables according to the jdo metadata (in our case package.jdo is the name of the metadata file) which incurs a small performance penalty.

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验证已经删除的数据文件不再存在数据库中，可查询V$DATAFILE视图。

To verify that deleted data files are no longer part of the database, query then$DATAFILEview.

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