code: def emit_begin(self) -> None:
      self._exec("SET TRANSACTION READ WRITE")
  
imports: from __future__ import annotations
  import re
  from typing import Any
  from typing import Optional
  from typing import TYPE_CHECKING
  from sqlalchemy.sql import sqltypes
  from .base import AddColumn
  from .base import alter_table
  from .base import ColumnComment
  from .base import ColumnDefault
  from .base import ColumnName
  from .base import ColumnNullable
  from .base import ColumnType
  from .base import format_column_name
  from .base import format_server_default
  from .base import format_table_name
  from .base import format_type
  from .base import IdentityColumnDefault
  from .base import RenameTable
  from .impl import DefaultImpl
  from ..util.sqla_compat import compiles
label_desc: Use image node_id 4 for calling the OracleImpl obj's underlying member method code with example usage: obj.emit_begin() without return types