What are the tools available for ONLINE and OFFLINE migration with minimal downtime for Oracle to MSSQL database

Hi @Indu Srinivas Welcome to the Microsoft Q&A platform, thanks for posting the question

I understand You want to know migration tools/services which can use for database migration from ORACLE to MSSQL.

For offline Migration, you can use SSMA, SSIS

https://video2.skills-academy.com/en-us/sql/ssma/oracle/migrating-oracle-data-into-sql-server-oracletosql?view=sql-server-ver16

for an online, either you can build some custom solution using ADF etc or use 3P data integration tools

you can never have zero downtime. it will be minimal based on the data sync 

Regards

Geetha