How does a datapump decide exactly the RCS over a network link?

I have a question. I use flashback_scn on one of my scripts and I was wondering if I have not specufy the flashback_scn?

How does the data pump without flashback_scn on network_link? How does he decide to what YVERT must export?

I am importing about 40 gigabytes of data which easily takes 2-3 hours on the network link.
He decides on the SNA at the start of the work?

What new data coming in 2-3 hours after I started the import job?

Looked around in the documentation, but could not find any useful information on this.

If you do not specify flashback_scn or flashback_time then only data that matches data in partitioned tables. It could also include nested tables, but it does include all the tables.

Let's say your network work includes these objects table_data and they are exported in this order and say that you add enough data to add 1000 to the RCS every 1/2 hour:

time object Yvert
11:30 table0 - unpartitioned 1000
12:00 table1:partition1 2000
12:30 table2 - non-partitioned 3000
01:00 table1:partition2 2000
01:30 table3 - non-partitioned 5000
02:00 table1.partition3 2000

If you do not specify a parameter of flashback, then only compatible data for table1. All 3 partitions will be exported with the SNA even. The CPN is the RCS at the first partition is exported. In the case precedent, if the first to export data of SNA 1000 the first partition of table 1 is exported from SNA 2000, then all partitions table 1 will be exported from SNA 2000. No other data is forced to be exported to the SNA 2000.

In exp/imp, you could say in line = y, but is not available in expdp/impdp. If you want all the data, you must specify a parameter of blowback. One of the easiest ways is to use:

flashback_time = sysdate

There was a problem with it in version 10 and I know it's fixed, but I do not know more what version it is attached to.

Dean

Tags: Database

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