The SQL command Select * from table(validate(t1, job_id => '_last')); is used to return errors from the last executed COPY command into table t1 in the current session. It checks the results of the most recent data load operation and provides details on any errors that occurred during that process1.

To start, resume, or suspend a warehouse, the role needs the OPERATE privilege. USAGE only allows reference to the object but not its activation.
Required Privileges for Starting a Warehouse:
* USAGE (to reference)
* OPERATE (to start/stop)
Reference:
Snowflake Docs: Warehouse Privileges

Snowflake virtual warehouses support a configuration file and command line options in SnowSQL to specify a default warehouse, which is characteristic C. Additionally, the size of a virtual warehouse can be changed at any time, which is characteristic E. These features provide flexibility and ease of use in managing compute resources2.
References = [COF-C02] SnowPro Core Certification Exam Study Guide, Snowflake Documentation

The ORGADMIN role in Snowflake is responsible for managing organization-level administrative functions, which include managing billing and credit data. This role has the highest level of administrative privileges and can oversee multiple Snowflake accounts within an organization.
Snowflake Documentation: Account and Organization Roles