集群

创建一个集群

请参考 Kubernetes 以获得关于创建 Kubernetes 集群的信息。

分布式读/写

SQL

可以按照步骤使用 SQL 来进行分布式插入和查询：

1. 使用 MySQL cli 连接到 Frontend。

   shell

   mysql -h 127.0.0.1 -P 4002

2. 通过 CREATE 语句创建一个分布式表。

   SQL

   CREATE TABLE dist_table(
       ts TIMESTAMP DEFAULT current_timestamp(),
       n INT,
       row_id INT,
       PRIMARY KEY(n),
       TIME INDEX (ts)
   )
   PARTITION BY RANGE COLUMNS (n) (
       PARTITION r0 VALUES LESS THAN (5),
       PARTITION r1 VALUES LESS THAN (9),
       PARTITION r2 VALUES LESS THAN (MAXVALUE),
   )
   engine=mito;

   结果如下：

   shell

   mysql> CREATE TABLE dist_table(
       ->     ts TIMESTAMP DEFAULT current_timestamp(),
       ->     n INT,
       ->     row_id INT,
       ->     TIME INDEX (ts)
       ->     TIME INDEX (ts)
       -> )
       -> PARTITION BY RANGE COLUMNS (n) (
       ->     PARTITION r0 VALUES LESS THAN (5),
       ->     PARTITION r1 VALUES LESS THAN (9),
       ->     PARTITION r2 VALUES LESS THAN (MAXVALUE),
       -> )
       -> engine=mito;
   Query OK, 3 rows affected (0.09 sec)

   dist_table 被分布在 Datanode 中。你可以参考 “Table Sharding” 了解更多细节。

3. 通过 INSERT 语句输入一些数据。

   SQL

   INSERT INTO dist_table(n, row_id) VALUES (1, 1);
   INSERT INTO dist_table(n, row_id) VALUES (2, 2);
   INSERT INTO dist_table(n, row_id) VALUES (3, 3);
   INSERT INTO dist_table(n, row_id) VALUES (4, 4);
   INSERT INTO dist_table(n, row_id) VALUES (5, 5);
   INSERT INTO dist_table(n, row_id) VALUES (6, 6);
   INSERT INTO dist_table(n, row_id) VALUES (7, 7);
   INSERT INTO dist_table(n, row_id) VALUES (8, 8);
   INSERT INTO dist_table(n, row_id) VALUES (9, 9);
   INSERT INTO dist_table(n, row_id) VALUES (10, 10);
   INSERT INTO dist_table(n, row_id) VALUES (11, 11);
   INSERT INTO dist_table(n, row_id) VALUES (12, 12);

4. 通过 SELECT 语句执行查询：

   sql

   SELECT * FROM dist_table ORDER BY n LIMIT 5;

   sql

   +---------------------+------+--------+
   | ts                  | n    | row_id |
   +---------------------+------+--------+
   | 2022-11-14 12:02:32 |    1 |      1 |
   | 2022-11-14 12:02:32 |    2 |      2 |
   | 2022-11-14 12:02:32 |    3 |      3 |
   | 2022-11-14 12:02:32 |    4 |      4 |
   | 2022-11-14 12:02:32 |    5 |      5 |
   +---------------------+------+--------+
   5 rows in set (0.081 sec)

   sql

   SELECT MAX(n) FROM dist_table;

   sql

   +-------------------+
   | MAX(dist_table.n) |
   +-------------------+
   |                12 |
   +-------------------+
   1 row in set (0.057 sec)

   sql

   SELECT MIN(n) FROM dist_table;

   sql

   +-------------------+
   | MIN(dist_table.n) |
   +-------------------+
   |                 1 |
   +-------------------+
   1 row in set (0.079 sec)

   sql

   SELECT * FROM dist_table WHERE n > 2 AND n < 10 ORDER BY row_id;

   sql

   +---------------------+------+--------+
   | ts                  | n    | row_id |
   +---------------------+------+--------+
   | 2022-11-14 12:02:32 |    3 |      3 |
   | 2022-11-14 12:02:32 |    4 |      4 |
   | 2022-11-14 12:02:32 |    5 |      5 |
   | 2022-11-14 12:02:32 |    6 |      6 |
   | 2022-11-14 12:02:32 |    7 |      7 |
   | 2022-11-14 12:02:32 |    8 |      8 |
   | 2022-11-14 12:02:32 |    9 |      9 |
   +---------------------+------+--------+
   7 rows in set (0.02 sec)

   sql

   SELECT * FROM dist_table WHERE row_id = 10;

   sql

   +---------------------+------+--------+
   | ts                  | n    | row_id |
   +---------------------+------+--------+
   | 2022-11-14 12:02:32 |   10 |     10 |
   +---------------------+------+--------+
   1 row in set (0.03 sec)