DROP TABLE if exists t1;
DROP TABLE if exists t2;
Testing tables with large records
CREATE TABLE t1 (a INT NOT NULL PRIMARY KEY AUTO_INCREMENT, b VARCHAR(256), KEY SECOND(a, b)) ENGINE=INNODB;
INSERT INTO t1 VALUES (1, REPEAT('A', 256));
INSERT INTO t1 (b) SELECT b from t1;
INSERT INTO t1 (b) SELECT b from t1;
INSERT INTO t1 (b) SELECT b from t1;
INSERT INTO t1 (b) SELECT b from t1;
INSERT INTO t1 (b) SELECT b from t1;
INSERT INTO t1 (b) SELECT b from t1;
INSERT INTO t1 (b) SELECT b from t1;
INSERT INTO t1 (b) SELECT b from t1;
INSERT INTO t1 (b) SELECT b from t1;
INSERT INTO t1 (b) SELECT b from t1;
optimize table t1;
Table	Op	Msg_type	Msg_text
test.t1	optimize	status	OK
select sleep(1);
sleep(1)
0
select count(*) from t1;
count(*)
927
select count(*) from t1 force index (second);
count(*)
927
# A few more insertions on the page should not cause a page split.
insert into t1 values (81, REPEAT('A', 256));
insert into t1 values (83, REPEAT('A', 256));
insert into t1 values (87, REPEAT('A', 256));
insert into t1 values (82, REPEAT('A', 256));
insert into t1 values (86, REPEAT('A', 256));
# More insertions will cause page splits
insert into t1 values (88, REPEAT('A', 256));
insert into t1 values (85, REPEAT('A', 256));
insert into t1 values (84, REPEAT('A', 256));
DROP TABLE t1;
Testing table with small records
CREATE TABLE t2 (a INT NOT NULL PRIMARY KEY AUTO_INCREMENT, b VARchar(16), KEY SECOND(a,b)) ENGINE=INNODB;
optimize table t2;
Table	Op	Msg_type	Msg_text
test.t2	optimize	status	OK
select sleep(1);
sleep(1)
0
select count(*) from t2 force index(second);
count(*)
3701
The page should have room for about 20 insertions
insert into t2 values(1181, REPEAT('A', 16));
insert into t2 values(1191, REPEAT('A', 16));
insert into t2 values(1182, REPEAT('A', 16));
insert into t2 values(1192, REPEAT('A', 16));
insert into t2 values(1183, REPEAT('A', 16));
insert into t2 values(1193, REPEAT('A', 16));
insert into t2 values(1184, REPEAT('A', 16));
insert into t2 values(1194, REPEAT('A', 16));
insert into t2 values(1185, REPEAT('A', 16));
insert into t2 values(1195, REPEAT('A', 16));
insert into t2 values(1186, REPEAT('A', 16));
insert into t2 values(1196, REPEAT('A', 16));
insert into t2 values(1187, REPEAT('A', 16));
insert into t2 values(1197, REPEAT('A', 16));
insert into t2 values(1188, REPEAT('A', 16));
insert into t2 values(1198, REPEAT('A', 16));
insert into t2 values(1189, REPEAT('A', 16));
insert into t2 values(1199, REPEAT('A', 16));
insert into t2 values(1190, REPEAT('A', 16));
insert into t2 values(1180, REPEAT('A', 16));
More insertions will cause page split.
insert into t2 values(1280, REPEAT('A', 16));
insert into t2 values(1290, REPEAT('A', 16));
insert into t2 values(1281, REPEAT('A', 16));
insert into t2 values(1291, REPEAT('A', 16));
DROP TABLE t2;