Why import data if ready schema and index create, increase in Undo TableSpace

I have a problem importing data.
When I export data don't have schema import include the index schema.
And then I import the schema ready.
When I import data, I find this Undo TableSpace increase very fast.
I have therefore two tests.
1. IMPORT of data and index, every thing ok look
2 import a schema includes index
and then import data. Undo Tablespace very rapid increase

If you mean undo tablespace increase in order to read consisten read.

N ° cancel space use increases due to the DML. (requests for consistent readings read undo, they generate no cancellation to grow)

so you're saying that redo log appear, rollback undo segment will increase.

N ° increase in written cancellations results increase in roll forward.

IF we import large data, we must export data with the index and import data right now

If you import large data, you must create the indexes after the data is imported. If the index definitions are included in the export, the default behavior is that import will create them once the data is imported. To do this, undo lower for indexes.
Note This will generate redo for the creation (but does not cancel and therefore not generate recovery for cancellation). You can avoid this by manually running CREATE INDEX... NOLOGGING - but it means you need to get and modify the scripts CREATE INDEX.

Hemant K Collette

Tags: Database

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