Search notes:

Oracle: ALTER SYSTEM CANCEL SQL

alter system cancel sql terminates an SQL statement being executed. 
alter system cancel sql 'sid serial';
alter system cancel sql 'sid serial@instance_id';
alter system cancel sql 'sid serial sql_id';
alter system cancel sql 'sid serial@instance_id sql_id';

See also

Stopping the execution of an SQL statement (possibly because it runs for too long).
Terminating sessions

Index

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