使用expdp 的NETWORK_LINK引數，實現在客戶端形成匯出檔案時的幾個限制：

摘自：

Export/Import DataPump Parameter VERSION - Compatibility of Data Pump Between Different Oracle Versions [Video] [ID 553337.1]

Restrictions:
1. Tables with a LONG column are not supported in an Export Data Pump job with NETWORK_LINK parameter. An ORA-31679 error will be generated and the export will move on to the next table. See also section 8.11. "ORA-31679 (Table data object "aaa"."bbb" has long columns, and longs can not be loaded/unloaded using a network link)" below.

帶有long資料型別的表不能在expdp 加NETWORK_LINK時被匯出。

2. Tables with object_type columns are not supported in an Export Data Pump job with NETWORK_LINK parameter. An ORA-22804 error will be generated and the export will move on to the next table. See also section 8.12. "ORA-22804 (remote operations not permitted on object tables or user-defined type columns)" below.

帶有object_type資料型別的表不能在expdp 加NETWORK_LINK時被匯出。

3. When both the NETWORK_LINK and the TABLES parameters are used, then only whole tables can be exported (not partitions of tables). Trying to export a partition of a table over a database link will fail with ORA-39203 (Partition selection is not supported over a network link) or in older releases with ORA-14100 (partition extended table name cannot refer to a remote object). See also section 8.13. "ORA-39203 (Partition selection is not supported over a network link)" below.

在expdp 加NETWORK_LINK時，不能匯出分割槽表中的某個分割槽。

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