ORA-00021 Error -> Session attached to some other Process; cannot switch Session

By Santhosh N

This explains the oracle error, ORA-00021 in detail, the possible reason(s) and steps to solve the same in Oracle Database.

Oracle Error: ORA-00021

Description: Session attached to some other Process; cannot switch Session.

Reason(s) for this Oracle error: This error will be raised when you try to switch to a session that is currently used by other process.

Possible steps to solve this error:
1) Avoid switching to a session that is attached to some other process.

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ORA-00021 Error -> Session attached to some other Process; cannot switch Session  (1062 Views)