Issue with DML statements in production

Hi all ,
We are using Oracle 11g. The issue is the following:
We have to load some tables during the working day by selecting the data we need from another sources/schemas / and then to insert that data into the production environement.
The problem is that the source tables are very big/about 10 milion rows/ and while we are trying to get that data /select/ and then process it /insert/ into the PROD we may crash the system.../It's just an assumption/. Even without using cursors or bulk operation but simple inserts we may overload it...
Any ideas what options do we have? For example to process the data by portions ? But how?
Thanks in advance,
Alexander.

a.stoyanov wrote:
Hi,
Thanks for reply.
Because the logic for inserting the data it's not so simple, we are not sure the pure SQL can satisfy the conditions how the data has to be loaded. Is there a way to process for example 10 000 rows then do something like sleep and then get another 10 000 rows and so on...? By this approach i think we are not going to overload the system with queries .. but how to achieve this or there is a better way?
Thanks in advance,
Alexander.Actually, it's more likely to increase the workload on the server doing it in batches of records, especially if you plan on committing each batch, which would then also introduce transactional issues if something fails as well as the technical issues of potentially causing the server to start up more writer processes. Multiple queries are a heavier workload on the server than fewer queries.
Is the process you are doing really something that cannot be done in SQL? In a lot of cases SQL is perfectly capable of doing whatever processing is necessary.
You'd have to give us an example of why you feel you need to do it in batches and why the processing can't be done directly in SQL.

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