| Current Path : /home/usr.opt/mysql57/mysql-test/r/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //home/usr.opt/mysql57/mysql-test/r/filesort_merge.result |
CREATE TABLE t1 (
id int NOT NULL auto_increment PRIMARY KEY,
b int NOT NULL,
c datetime NOT NULL,
INDEX idx_b(b),
INDEX idx_c(c)
) ENGINE=InnoDB;
CREATE TABLE t2 (
b int NOT NULL auto_increment PRIMARY KEY,
c datetime NOT NULL
) ENGINE= MyISAM;
INSERT INTO t2(c) VALUES ('2007-01-01');
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t2(c) SELECT c FROM t2;
INSERT INTO t1(b,c) SELECT b,c FROM t2;
UPDATE t2 SET c='2007-01-02';
INSERT INTO t1(b,c) SELECT b,c FROM t2;
UPDATE t2 SET c='2007-01-03';
INSERT INTO t1(b,c) SELECT b,c FROM t2;
set @@sort_buffer_size=8192;
Warnings:
Warning 1292 Truncated incorrect sort_buffer_size value: '8192'
SELECT COUNT(*) FROM t1;
COUNT(*)
3072
EXPLAIN
SELECT COUNT(*) FROM t1 FORCE INDEX(idx_b, idx_c)
WHERE (c >= '2007-01-02' AND c <= '2007-01-03') OR b >= 1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL index_merge idx_b,idx_c idx_c,idx_b 5,4 NULL # 100.00 Using sort_union(idx_c,idx_b); Using where
Warnings:
Note 1003 /* select#1 */ select count(0) AS `COUNT(*)` from `test`.`t1` FORCE INDEX (`idx_c`) FORCE INDEX (`idx_b`) where (((`test`.`t1`.`c` >= '2007-01-02') and (`test`.`t1`.`c` <= '2007-01-03')) or (`test`.`t1`.`b` >= 1))
SELECT COUNT(*) FROM t1 FORCE INDEX(idx_b, idx_c)
WHERE (c >= '2007-01-02' AND c <= '2007-01-03') OR b >= 1;
COUNT(*)
3072
set @@sort_buffer_size=default;
DROP TABLE t1,t2;
set optimizer_switch='semijoin=off';
set optimizer_switch='materialization=off';
CREATE TABLE t1 (topic BIGINT NOT NULL DEFAULT 0);
SET @@session.sort_buffer_size=32768;
SELECT * from t1 WHERE topic IN
(SELECT topic FROM t1 GROUP BY topic HAVING topic < 2000)
LIMIT 2
;
topic
1370
1369
SET @@session.sort_buffer_size=DEFAULT;
drop table t1;
set optimizer_switch=default;