How we can transfer the Database data to magento 1.9 to Magento 2 stable. As lots of tool available but did not find any useful detail about migration. Does any one tried to migrate data. What kind of step need to perform. I tried Ubertheme tool but did not work
Use the official data migration tool: https://github.com/magento/data-migration-tool-ce
For now it it outdated: not working with the Release and the Release Candidate versions, but it works with the Betas and it is open source so you can fix it to work with the Release by yourself or just wait: surely, Magento 2 team will update it and has not do it yet just because they was busy with the Release.