Hello,
For a database called DB1 and a schema called SCOTT can you please give an example using Data Pump to:
1. Estimate how long an export will take (without actually running it)?
2. Estimate how long an import will take (without actually running it)?
3. Tricky part, (how) can an import time be estimated if an export file is not yet created?
Question three spawns from a scenario where management needs an answer to a task where the export will not have been done yet (as it may take several hours and much disk space).
Thanks,
Michael4606
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Michael, I'm intrigued by your question, but my references do not include any mention whatsoever of estimating elapsed time. Storage, yes. My professional opinion is that your trial-and-error method is as good as any advice you'll get -- but someone may have facts or a procedure I need to learn. Hope this helps a little.
Hi,
The time for export/import is highly dependent on your configuration including cpu speed, disk speeds, available disk space and various other parameters like the number of tables, indexes, PK/FK constraints you have and whether you can parallelize the operation or not.
So, there is no real algorithm to estimate the time. Try to execute both export and import and then you can compate the time taken for export and then import and then you can come for an estimate. When your data grows, you can roughly estimate how much time it takes for export and import or you can estimate the import time by multiplying your previous import running.
HTH
Regards,
Badri.
HTH.
There are some measures to speed up the Export/Import using Data Pump.
First at all if this is a bulk operation try to switch the instance to RESTRICTED mode.
If this is not possible use the pump in good time hen the system is not overloade.
Second use paralel threads and paralel files for Export/Import.
Third try to divide the job in smaller chunks. Example: export application per application,
not the whole system.
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by: michael4606Posted on 2008-08-28 at 04:28:54ID: 22333573
Guys,
I know my question was tough and gave you little to go on. I have some new data that may help. I just performed an export of the schema and it took exactly 4 hours (during business hours).
Performing off hours when there is no load on the database, what I really need to determine is the maximum time an import of this same data will take.
Is there an algorithm or the like you guys have found success with?
Again, this is the Data Pump (not legacy export\import) and it is using the Standard Edition (so using the PARALLEL option not possible).
Thanks again,
Michael4606