mysql 5.6 分区与不分区的区别
mysql> CREATE TABLE t1 ( id INT, date DATETIME DEFAULT CURRENT_TIMESTAMP) ENGINE=Innodb;
Query OK, rows affected mysql> insert into t1 values(, '2013-05-23 12:59:39');
Query OK, row affected mysql> insert into t1 values(, '2013-05-23 12:59:43');
insert into t1 values(, '2013-05-23 12:59:44');
insert into t1 values(, '2013-07-04 19:35:45');
insert into t1 values(, '2014-04-04 19:35:45' );
insert into t1 values(, '2014-05-04 19:35:45' );
insert into t1 values(, '2015-05-04 19:35:45');
insert into t1 values(, '2015-05-05 19:35:45');
insert into t1 values(, '2017-05-05 19:35:45');
insert into t1 values(,'2018-05-05 19:35:45' );
Query OK, row affected Query OK, row affected Query OK, row affected Query OK, row affected Query OK, row affected Query OK, row affected Query OK, row affected Query OK, row affected Query OK, row affected mysql> select * from t1;
+----+---------------------+
| id | date |
+----+---------------------+
| | -- :: |
| | -- :: |
| | -- :: |
| | -- :: |
| | -- :: |
| | -- :: |
| | -- :: |
| | -- :: |
| | -- :: |
| | -- :: |
+----+---------------------+
rows in set mysql> explain select * from t1;
+----+-------------+-------+------+---------------+------+---------+------+------+-------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+------+---------------+------+---------+------+------+-------+
| | SIMPLE | t1 | ALL | NULL | NULL | NULL | NULL | | NULL |
+----+-------------+-------+------+---------------+------+---------+------+------+-------+
row in set mysql> EXPLAIN SELECT * FROM t1 WHERE date >= '2014-03-05 19:00:12' AND date <= '2016-03-05 18:45:12';
+----+-------------+-------+------+---------------+------+---------+------+------+-------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+------+---------------+------+---------+------+------+-------------+
| | SIMPLE | t1 | ALL | NULL | NULL | NULL | NULL | | Using where |
+----+-------------+-------+------+---------------+------+---------+------+------+-------------+
row in set mysql> CREATE TABLE t2 ( id INT, date DATETIME DEFAULT CURRENT_TIMESTAMP) ENGINE=Innodb
PARTITION BY RANGE (YEAR(date)) (
PARTITION p2013 VALUES LESS THAN(),
PARTITION p2014 VALUES LESS THAN(),
PARTITION p2015 VALUES LESS THAN(),
PARTITION p2016 VALUES LESS THAN(),
PARTITION p2017 VALUES LESS THAN(),
PARTITION p2099 VALUES LESS THAN MAXVALUE
) ;
Query OK, rows affected mysql> show create table t2;
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| t2 | CREATE TABLE `t2` (
`id` int() DEFAULT NULL,
`date` datetime DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8
/*!50100 PARTITION BY RANGE (YEAR(date))
(PARTITION p2013 VALUES LESS THAN (2014) ENGINE = InnoDB,
PARTITION p2014 VALUES LESS THAN (2015) ENGINE = InnoDB,
PARTITION p2015 VALUES LESS THAN (2016) ENGINE = InnoDB,
PARTITION p2016 VALUES LESS THAN (2017) ENGINE = InnoDB,
PARTITION p2017 VALUES LESS THAN (2018) ENGINE = InnoDB,
PARTITION p2099 VALUES LESS THAN MAXVALUE ENGINE = InnoDB) */ |
+-------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
row in set mysql> SELECT table_name,partition_name,table_rows FROM information_schema.PARTITIONS WHERE table_schema=database() AND table_name='t2';
+------------+----------------+------------+
| table_name | partition_name | table_rows |
+------------+----------------+------------+
| t2 | p2013 | |
| t2 | p2014 | |
| t2 | p2015 | |
| t2 | p2016 | |
| t2 | p2017 | |
| t2 | p2099 | |
+------------+----------------+------------+
rows in set mysql> EXPLAIN SELECT * FROM t2;
+----+-------------+-------+------+---------------+------+---------+------+------+-------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+------+---------------+------+---------+------+------+-------+
| | SIMPLE | t2 | ALL | NULL | NULL | NULL | NULL | | NULL |
+----+-------------+-------+------+---------------+------+---------+------+------+-------+
row in set mysql> insert into t2 select * from t1;
Query OK, rows affected
Records: Duplicates: Warnings: mysql> explain select * from t2;
+----+-------------+-------+------+---------------+------+---------+------+------+-------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+------+---------------+------+---------+------+------+-------+
| | SIMPLE | t2 | ALL | NULL | NULL | NULL | NULL | | NULL |
+----+-------------+-------+------+---------------+------+---------+------+------+-------+
row in set mysql> select * from t2;
+----+---------------------+
| id | date |
+----+---------------------+
| | -- :: |
| | -- :: |
| | -- :: |
| | -- :: |
| | -- :: |
| | -- :: |
| | -- :: |
| | -- :: |
| | -- :: |
| | -- :: |
+----+---------------------+
rows in set mysql> SELECT table_name,partition_name,table_rows FROM information_schema.PARTITIONS WHERE table_schema=database() AND table_name='t2';
+------------+----------------+------------+
| table_name | partition_name | table_rows |
+------------+----------------+------------+
| t2 | p2013 | |
| t2 | p2014 | |
| t2 | p2015 | |
| t2 | p2016 | |
| t2 | p2017 | |
| t2 | p2099 | |
+------------+----------------+------------+
rows in set mysql> EXPLAIN PARTITIONS SELECT * FROM t2 WHERE date >= '2014-03-05 19:00:12' AND date <= '2016-03-05 18:45:12';
+----+-------------+-------+-------------------+------+---------------+------+---------+------+------+-------------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+-------+-------------------+------+---------------+------+---------+------+------+-------------+
| | SIMPLE | t2 | p2014,p2015,p2016 | ALL | NULL | NULL | NULL | NULL | | Using where |
+----+-------------+-------+-------------------+------+---------------+------+---------+------+------+-------------+
row in set mysql>
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