Oracle:

SET TRANSACTION

SET TRANSACTION
{ { READ { ONLY | WRITE }
| ISOLATION LEVEL
{ SERIALIZABLE | READ COMMITTED }
| USE ROLLBACK SEGMENT rollback_segment
} [ NAME string ]
| NAME string
} ;

Example

COMMIT;

SET TRANSACTION READ ONLY NAME 'Toronto';

SELECT product_id, quantity_on_hand FROM inventories
WHERE warehouse_id = 5
ORDER BY product_id;

COMMIT;

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