Hi @DineshMudgil!
All OHDSI tools currently support PostgreSQL, Oracle, SQL Server, Amazon Redshift, and Microsoft APS. Support for Netezza and Hadoop (through Impala) has also been implemented, but I’m not 100% they are completely functional. People have looked at Google BigQuery, but found insurmountable obstacles with that platform.
Could you tell us what you mean by “cloud-based Big data platforms”?