数据牛刀是一款提供大数据表自动分割、归档和清理过期数据的服务。它使用C# /.NET CORE实现，当前支持Mysql数据源。

Data Niu Knife is a service provides to automatically splits, archive, and clean up stale data for big data tables. It is implemented using C# /.NET CORE and currently supports Mysql data sources.

核心功能：

1. 通过简单的配置，可管理任意多个数据库节点上的大数据表的定期数据分割、归档和清理。
2. 每日执行数据复制。
3. 按指定天数移除过期数据。
4. 按月归档数据。

Key Features:

1. through simple configuration, can manage the regular data segmentation, archiving and cleaning of big data tables on any number of database nodes.
2. Perform data replication daily.
3. Remove expired data by the specified number of days.
4. Archive data by month.

希望使用此服务的大数据表，有如下要求：

1. 数据表存在自增长ID；
2. 数据表存在时间列，数据以时间顺序增长；
3. 数据表不存在外键约束；
4. 提供一个拥有读取数据表元数据和建表权限的数据库账号；

If you want to use this service be sure following requirements:

1. the big data table is based on the self-growth ID;
2. the big data table has time column, the data grows by time order;
3. the big data table does not have a foreign key at all;
4. need a DB Account with the authority to read the data table metadata and create the data table;

配置示例： Configuration Sample:

{
"AppSettings": {
    "LogManPath": "/app/LogMan/"       
},
"MySqlClusterSettings": {
    "Nodes": [
        {    
           {
            "MysqlNode": {
                "ID":1,
                "IsSlave": false,
                "DataBasesName": "data_sharding_a",
                "ConnStr": "server=192.168.3.250;database=data_sharding_a;user=app_user;password=your pwd;charset=utf8;",
                "DevideFromNodeID": 0,
                "DevideDataSet": "table 1:hash key,table 2:hash key,table n:hash key",
                "AutoMoveDataSet": "table_name=data_shard,key_name=id,date_field=created,data_hold_days=180,archive_node_id=2,schedule_time=23:00:00;"
            }
        },
        {
            "MysqlNode": {
                "ID": 2,
                "IsSlave": false,
                "DataBasesName": "data_sharding_b",
                "ConnStr": "server=192.168.3.250;database=data_sharding_b;user=app_user;password=your pwd;charset=utf8;",
                "DevideFromNodeID": 0,
                "DevideDataSet": "",
                "AutoMoveDataSet": ""
            }
        }
    ]
},
"AllowedHosts": "*"
}

理解这一段配置： Understand this paragraph configuration:

"AutoMoveDataSet": "table_name=data_shard,key_name=id,date_field=created,data_hold_days=180,archive_node_id=2,schedule_time=23:00:00;"

table_name: 要列入自动管理的数据表名。 the name of data table that you want to use this service.

key_name: 主键名。 main key on the data table.

date_field: 时间列名。 the date time column.

data_hod_days: 数据保留期的天数。 how many days for keep the data before removed.

archive_node_id: 本配置中作为归档库的数据库节点ID。 the data archive DB node id in this configures.

schedule_time: 每日运行的计划时间。 the time for start jobs per day.

本服务可以在docker容器中运行： This service supports docker container:

docker build -f Dockfile -t data_niu_knife:demo .
docker run --name data_niu_knife_hosted --mount type=bind,source=/home/docker_data/DataNiuKnife/LogMan/,target=/app/LogMan/ -d data_niu_knife:demo .

正常运行后可看到类似下方的日志： After start the service, you can see some logs like below:

[root@localhost ~]# cat /home/docker_data/DataNiuKnife/LogMan/MysqlDataWorker-2019-07-29-pid1.log
====== DataNiuKnife.MysqlDataWorker Info 07/29/2019 11:00:00 ======
MysqlDataWorker已在服务环境启动，源表名:data_shard
====== DataNiuKnife.MysqlDataWorker Info 07/29/2019 11:00:00 ======
开始自动创建分表，表名:data_shard_spt_201907
====== DataNiuKnife.MysqlDataWorker Info 07/29/2019 11:00:00 ======
开始创建分表:
CREATE TABLE IF NOT EXISTS `data_shard_spt_201907`   (
  `id` bigint(10) unsigned NOT NULL AUTO_INCREMENT,
  `value` varchar(255) DEFAULT NULL,
  `created` datetime NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=51 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
====== DataNiuKnife.MysqlDataWorker Info 07/29/2019 11:00:01 ======
成功创建分表:data_shard_spt_201907
====== DataNiuKnife.MysqlDataWorker Info 07/29/2019 11:00:01 ======
成功自动创建分表，表名:data_shard_spt_201907
====== DataNiuKnife.MysqlDataWorker Info 07/29/2019 11:00:01 ======
开始自动复制数据，源表名:data_shard,分表名:data_shard_spt_201907
====== DataNiuKnife.MysqlDataWorker Info 07/29/2019 11:00:02 ======
自动复制了50笔数据，源表名:data_shard,分表名:data_shard_spt_201907