Table level refresh in oracle from prod to test or development database

Hi,
one interviewer asked me the below question, what is the best answer.
suggestions appreciated.
1.How did you deal with that situation?Consider if you have a repeated requirement to "refresh" just 30 tables in a particular schema from a production environment into a development environment. What steps would you follow to get those tables? What things would you consider doing in the database to make this process easier in the future?
2. You have an Oracle 10.2.0.4 database set up on Unix. The application is on a Windows server. The system is generally OLTP but with major batch jobs run over the weekend when the users are offline. On Monday morning the users in 2 of the 3 major remote sites that access the application are complaining of general slowness, like the system is hanging at periods and it seems to be taking 7 or 8 times as long to process their transactions and some sessions have been disconnected. There have been no major changes to these environment components (Unix server, application server, network, WAN, etc.). You are not sure if there have been any changes to the application code as the team involved in rolling out module changes are offline; however that team should be following a change management process and recording their changes, and no such changes have been recorded. You are the support DBA in charge of this environment and have a high priority ticket in your queue due to this slowness. Can you describe what you would investigate from start to finish to try and establish where this problem lies?
Thanks
Prakash
Edited by: user12287006 on Dec 3, 2009 7:39 AM
Edited by: user12287006 on Dec 3, 2009 7:55 AM

Hi,
1) We need to check the total size of these 30 tables, if they are very huge I would make sure that these 30 tables resides in same group of tablespaces along with no other tables residing there. And then i would use transportable tablespace to clone the tables. If they are small yes i would do exp/imp or expdp/impdp through the read to run scripts.
2) Since you mention that batch jobs were run during weekends, I assume there are chances that my explain plan were changed (if stats are being gathered) or the current explan plan is not appropriate given the condition that the batch jobs have done huge insert/update/delete. In this case I would prevent gathering stats and would lock the stats.
If this is not the case then i would check if user is facing issue with a particular application or entire application in general. If it is entire application in general, i would compare awr report for some events like SQL*Net message from/to client for network issue, db sequential/scattered read for io issue. Assuming these both are not the cases, then i would check if the application works fast if there is caching of some table required by OLTP and not by batch process that moved out of buffer during the weekend. The later issue would get resolved after some time in Monday morning. But when I realized if this is the issue then I would have some mechanism to bring them again in cache after next weekend batch jobs.
Regards
Anurag

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