A user has 10 k means Clusters from a data set and wants to build 10 linear regression models with all these clusters separately. How to do this using loops in R?

Yes DML operations (update/insert/ delete) are allowed in the procedure also (DDL: such as create/ alter/drop/ truncate) is also allowed in the procedures.

In case if the procedure will get executed in parallel then DDL on a permanent table is not recommended as there could be chances that one procedure has already created a permanent table and another procedure is trying to create a table then one procedure may fail.

However it is recommended to use DDL statements if they exist and transactions should be used elsewhere there will be a chance of failing a procedure