Oracle:

ALTER SESSION

ALTER SESSION
{ ADVISE { COMMIT | ROLLBACK | NOTHING }
| CLOSE DATABASE LINK dblink
| { ENABLE | DISABLE } COMMIT IN PROCEDURE
| { ENABLE | DISABLE } GUARD
| { ENABLE | DISABLE | FORCE } PARALLEL
{ DML | DDL | QUERY } [ PARALLEL integer ]
| { ENABLE RESUMABLE [ TIMEOUT integer ] [ NAME string ]
| DISABLE RESUMABLE
}
| SYNC WITH PRIMARY
| alter_session_set_clause
} ;

alter_session_set_clause ::=
SET { { parameter_name = parameter_value }...
| EDITION = edition_name
}

Example

ALTER SESSION ENABLE PARALLEL DML;

ALTER SESSION
ADVISE COMMIT;

ALTER SESSION
ADVISE ROLLBACK;

ALTER SESSION
CLOSE DATABASE LINK local;

ALTER SESSION
SET NLS_DATE_FORMAT = 'YYYY MM DD HH24:MI:SS';

ALTER SESSION
SET NLS_DATE_LANGUAGE = French;

ALTER SESSION
SET NLS_ISO_CURRENCY = America;

ALTER SESSION SET NLS_NUMERIC_CHARACTERS = ',.' ;

ALTER SESSION
SET SQL_TRACE = TRUE;

ALTER SESSION SET QUERY_REWRITE_ENABLED = TRUE;