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JaanuJaanu 

How to migrate millions of records from legacy to salesforce?

We have a project, where in I have migrate millions of records to salesforce. I think they are going to give a data base connection or excel sheet .. and ask us to migrate ?
 
I have to create Leads, Accounts, Opps, Cases, contacts in Salesforce.

Before Migration
1. What are the things I need to take care in Salesfroce ?
2. What are the things I need to take care in Source System ?
3. I can't have record owner same for all  ? it will cause issues in salesforce ... how to change it ? 
4. Can I change date and time stamps of the records loaded into salesforce ?
5. How to take care of the relationships 

Migration
1. What is the best time to do the migration into PROD. Org ?
2. How to test in Sandbox to make sure it'sok.

After Migration
3. Any issue with the size or processing times after migration into salesforce ?
NagendraNagendra (Salesforce Developers) 
Hi Jaanu,

May I suggest you please check with below link from the success community with a similar discussion which might help you further. Please let us know if this helps.

Kindly mark this as solved if the information was helpful.

Thanks,
Nagendra
Kailas NambiKailas Nambi
Hi,

Please refer the below link for your questions which will be helpful for you.

https://www.toptal.com/salesforce/how-to-successfully-migrate-legacy-data

Thanks
Nambi
Sweet Potato Tec