specifies whether or not the export utility uses the set transaction read only
statement to ensure that the data exported is consistent to a single point in time and
does not change during the export. if object_consistent is set to y, each object
is exported in its own read-only transaction, even if it is partitioned. in contrast, if
you use the Consistent parameter, then there is only one read-only transaction.
与Consistent参数的区别:
1. Object_Consistent是每个导出的对象都有每个对象的consistent
2. 就算表是分区表 , 就算在导出的过程中被其他用户update,then commit,都是consistent
3. Consistent所有导出的表在同一个Consistent
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