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   1 # pq\Transaction pq\Connection::startTransactionAsync([int $isolation = pq\Transaction::READ_COMMITTED[, bool $readonly = FALSE[, bool $deferrable = FALSE]]])
   2
   3 [Asynchronously](pq/Connection/: Asynchronous Usage) begin a transaction.
   4
   5 ## Params:
   6
   7 * Optional int $isolation = pq\Transaction::READ_COMMITTED
   8   Any pq\Transaction isolation level constant
   9   (defaults to pq\Connection::$defaultTransactionIsolation).
  10 * Optional bool $readonly = FALSE
  11   Whether the transaction executes only reads
  12   (defaults to pq\Connection::$defaultTransactionReadonly).
  13 * Optional bool $deferrable = FALSE
  14   Whether the transaction is deferrable
  15   (defaults to pq\Connection::$defaultTransactionDeferrable).
  16
  17 > ***NOTE:***
  18   A transaction can only be deferrable if it also is readonly and serializable.
  19   See the official [PostgreSQL documentaion](http://www.postgresql.org/docs/current/static/sql-set-transaction.html) for further information.
  20
  21 ## Returns:
  22
  23 * pq\Transaction, an asynchronously begun transaction instance.
  24
  25 ## Throws:
  26
  27 * pq\Exception\InvalidArgumentException
  28 * pq\Exception\BadMethodCallException
  29 * pq\Exception\RuntimeException