PRAGMA journal_mode = wal;
  CREATE TABLE t1(a, b, c);
  INSERT INTO t1 VALUES(1, 2, 3);
  INSERT INTO t1 VALUES(4, 5, 6);

 SELECT * FROM t1 
 SELECT * FROM t1 

  CREATE TABLE t1(x);
  PRAGMA journal_mode = wal;
  INSERT INTO t1 VALUES(1);
  INSERT INTO t1 VALUES(2);


  PRAGMA journal_mode = wal;
  CREATE TABLE t1(x, y);
  INSERT INTO t1 VALUES('a', 'b');
  INSERT INTO t1 VALUES('c', 'd');


  SELECT * FROM t1;


  CREATE TABLE t2(x);
  PRAGMA journal_mode = wal;
  INSERT INTO t2 VALUES('abc');
  INSERT INTO t2 VALUES('def');
  INSERT INTO t2 VALUES('ghi');