Calling cursor.execute() or cursor.fetchall() after cursor.close() has been called. Using a cursor after exiting a context manager (with conn.cursor() as cursor) that closes it automatically. Cursor was closed due to connection.close() being called while the cursor was still in scope. Reusing a cursor object stored in a module-level variable after the connection was recycled. Multi-threaded code where one thread closes the cursor while another is still using it

Create a new cursor for each query: use cursor = conn.cursor() before each operation.. Use context managers and do all cursor operations inside the with block.. Do not store cursor objects at module level — always create them from the active connection.. In multi-threaded code, create separate cursors per thread or use a thread-safe connection pool.. If using connection.close() as a cleanup step, ensure all cursors are finished before closing.

Low severityexecutionSnowflake →

Power BI Refresh Error:
252006

What does this error mean?

An operation was attempted on a cursor object that has already been closed. Once cursor.close() is called, the cursor cannot be used for further query execution or result fetching.

Common causes

1Calling cursor.execute() or cursor.fetchall() after cursor.close() has been called
2Using a cursor after exiting a context manager (with conn.cursor() as cursor) that closes it automatically
3Cursor was closed due to connection.close() being called while the cursor was still in scope
4Reusing a cursor object stored in a module-level variable after the connection was recycled
5Multi-threaded code where one thread closes the cursor while another is still using it

How to fix it

1Create a new cursor for each query: use cursor = conn.cursor() before each operation.
2Use context managers and do all cursor operations inside the with block.
3Do not store cursor objects at module level — always create them from the active connection.
4In multi-threaded code, create separate cursors per thread or use a thread-safe connection pool.
5If using connection.close() as a cleanup step, ensure all cursors are finished before closing.

Frequently asked questions

Should I reuse a cursor across multiple queries?

You can, but be cautious — always fetch all results before executing the next query on the same cursor. For concurrent operations, use separate cursors.

Does closing the connection automatically close all cursors?

Yes — closing the connection invalidates all cursors derived from it. Always complete cursor operations before closing the connection.

Official documentation: https://github.com/snowflakedb/snowflake-connector-python/blob/main/src/snowflake/connector/errorcode.py