Data Check for Tables with Different Schema or Table Names

When using replication tools such as TiDB Data Migration, you can set route-rules to replicate data to a specified table in the downstream. sync-diff-inspector enables you to verify tables with different schema names or table names by setting rules.

The following is a simple configuration example. To learn the complete configuration, refer to Sync-diff-inspector User Guide.

######################### Datasource config #########################
[data-sources.mysql1]
    host = "127.0.0.1"
    port = 3306
    user = "root"
    password = ""
    route-rules = ["rule1"]

[data-sources.tidb0]
    host = "127.0.0.1"
    port = 4000
    user = "root"
    password = ""
########################### Routes ###########################
[routes.rule1]
schema-pattern = "test_1"      # Matches the schema name of the data source. Supports the wildcards "*" and "?"
table-pattern = "t_1"          # Matches the table name of the data source. Supports the wildcards "*" and "?"
target-schema = "test_2"       # The name of the schema in the target database
target-table = "t_2"           # The name of the target table

This configuration can be used to check test_2.t_2 in the downstream and test_1.t_1 in the mysql1 instance.

To check a large number of tables with different schema names or table names, you can simplify the configuration by setting the mapping relationship by using rules. You can configure the mapping relationship of either schema or table, or of both. For example, all the tables in the upstream test_1 database are replicated to the downstream test_2 database, which can be checked through the following configuration:

######################### Datasource config #########################
[data-sources.mysql1]
    host = "127.0.0.1"
    port = 3306
    user = "root"
    password = ""
    route-rules = ["rule1"]

[data-sources.tidb0]
    host = "127.0.0.1"
    port = 4000
    user = "root"
    password = ""
########################### Routes ###########################
[routes.rule1]
schema-pattern = "test_1"      # Matches the schema name of the data source. Supports the wildcards "*" and "?"
table-pattern = "*"            # Matches the table name of the data source. Supports the wildcards "*" and "?"
target-schema = "test_2"       # The name of the schema in the target database
target-table = "t_2"           # The name of the target table

Note

If test_2.t_2 exists in the upstream database, the downstream database also compares this table.