Parallel parameter really reduce time for export?

Hi all;

I do realize too fast, if I use a parallel option when exporting.

As we know, the DIRECT PATH is much faster than the ACCESS EXTERNAL path.

With EXPDP reference documents.

When taking export using the parallel option, data access method would be 'EXTERNAL TABLE'

For large tables data pump always using external path rather than direct path.

in above case, if the size of the table in popular Go with "n" number of partitions, I can use parallel when the export option?

The version is 11.2.0.1 on RHEL

Hello

In this case, there are two types of parallel

external table 1) using a parallel query - what is likely to be slower in many cases only a process series using the direct path - query in parallel or single worker process usnig

(2) extract several tables "at the same time" and each made as direct path. -many workers all do another object at the same time

Thus, for example, that if you say Parallels 4, it is possible to get 4 datapump work process, each of these processes can extract another table at the same time, each of these excerpts is in the direct path,.

For most tables that's how it will work, if you use the query or you have some weird datatype or feature, then run the path may not be possible but in almost all cases of Parallels to export must be faster - because of the parallel unloading of objects.

Parallel queries to a single table for the external table access is generally slower.

Hope that makes sense...

See you soon,.

Rich

Tags: Database

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