Atlas Sharding 安裝、配置及簡單測試
mysql> select * from test;
+------+----------+
| id | name |
+------+----------+
| 1000 | test0001 |
| 1002 | t1002 |
| 1001 | t1001 |
| 1 | test01 |
| 2 | t02 |
| 3 | t03 |
| 4 | t04 |
+------+----------+
7 rows in set (0.01 sec)
mysql> select * from test where id in (1,1000);
+------+----------+
| id | name |
+------+----------+
| 1 | test01 |
| 1000 | test0001 |
+------+----------+
2 rows in set (0.02 sec)
mysql> select * from test where id between 3 and 1001;
+------+----------+
| id | name |
+------+----------+
| 3 | t03 |
| 4 | t04 |
| 1000 | test0001 |
| 1001 | t1001 |
+------+----------+
4 rows in set (0.02 sec)
mysql> select * from test where id >3 and id <1001;
+------+----------+
| id | name |
+------+----------+
| 4 | t04 |
| 1000 | test0001 |
+------+----------+
2 rows in set (0.00 sec)
mysql> select * from test where id <5 or id <1002;
+------+----------+
| id | name |
+------+----------+
| 1000 | test0001 |
| 1001 | t1001 |
| 1 | test01 |
| 2 | t02 |
| 3 | t03 |
| 4 | t04 |
+------+----------+
6 rows in set (0.00 sec)
mysql> select * from test where id >5 limit 3;
+------+----------+
| id | name |
+------+----------+
| 1000 | test0001 |
| 1002 | t1002 |
| 1001 | t1001 |
+------+----------+
3 rows in set (0.00 sec)
mysql> select * from test where id >5 limit 3 ,2;
ERROR 1105 (sqlst): Proxy Warning - Sharing Hit Multi Dbgroup Not Support SQL
--不支援Limit Offset
mysql> select * from test order by id desc;
ERROR 1105 (sqlst): Proxy Warning - Sharing Hit Multi Dbgroup Not Support SQL
--不支援跨goup的order by
mysql> select * from test where id >1000 order by id desc;
+------+-------+
| id | name |
+------+-------+
| 1002 | t1002 |
| 1001 | t1001 |
+------+-------+
2 rows in set (0.00 sec)
--在單個group內支援order by
mysql> select id from test where group by name ;
ERROR 1105 (HY000): Proxy Warning - near "group": syntax error
--跨goup不支援 group by ;
mysql> select id from test where id >999 group by name ;
+------+
| id |
+------+
| 1001 |
| 1002 |
| 1000 |
+------+
3 rows in set (0.01 sec)
--在單個group內支援group by ;
mysql> select count(*) from test;
ERROR 1105 (sqlst): Proxy Warning - Sharing Hit Multi Dbgroup Not Support SQL
--跨group不支援count;
mysql> select count(*) from test where id <100;
+----------+
| count(*) |
+----------+
| 4 |
+----------+
1 row in set (0.00 sec)
--單個group支援count；
mysql> select max(id) from test where id <100;
+---------+
| max(id) |
+---------+
| 4 |
+---------+
1 row in set (0.00 sec)
--單個group內支援max;
mysql> select max(id) from test ;
ERROR 1105 (sqlst): Proxy Warning - Sharing Hit Multi Dbgroup Not Support SQL
--跨group不支援max;
mysql> select min(id) from test;
ERROR 1105 (sqlst): Proxy Warning - Sharing Hit Multi Dbgroup Not Support SQL
---跨group不支援min;
mysql> select min(id) from test where id <100;
+---------+
| min(id) |
+---------+
| 1 |
+---------+
1 row in set (0.00 sec)
--單個group支援min;
mysql> select * from test t join tab01 k on k.id=t.id and tab01=1;
ERROR 1105 (sqlst): Proxy Warning - Sharing Hit Multi Dbgroup Not Support SQL
--不支援JOIN;