PRAGMA auto_vacuum = 2;
CREATE TABLE t1(x, y);
INSERT INTO t1 VALUES(randomblob(500), randomblob(500));
INSERT INTO t1 SELECT randomblob(500), randomblob(500) FROM t1;
INSERT INTO t1 SELECT randomblob(500), randomblob(500) FROM t1;
INSERT INTO t1 SELECT randomblob(500), randomblob(500) FROM t1;
INSERT INTO t1 SELECT randomblob(500), randomblob(500) FROM t1;
INSERT INTO t1 SELECT randomblob(500), randomblob(500) FROM t1;
INSERT INTO t1 SELECT randomblob(500), randomblob(500) FROM t1;
INSERT INTO t1 SELECT randomblob(500), randomblob(500) FROM t1;
BEGIN;
DELETE FROM t1 WHERE 1;
PRAGMA incremental_vacuum;