What is the description of the processing mode configuration of the target existing table in the RDS MySQL synchronization to polardb MySQL Cluster?

Pre check and report errors ： Check whether there is a table with the same name in the target database . If there is no table with the same name in the target database , Pass the inspection item ; If there is a table with the same name in the target database , Then an error will be prompted in the pre check phase , The data synchronization task will not be started .

explain If the table with the same name in the target library is inconvenient to delete or rename , You can change the name of the table in the target library , See library table column name mapping . Ignore the error and continue ： Skip checking whether there is a table with the same name in the target database . Warning Select ignore the error and continue to execute , Data may be inconsistent , Bring risks to the business , for example ： When the table structure is consistent , If you encounter a record with the same value as the primary key of the source database in the target database ： Full volume period ,DTS The record in the target cluster will be retained , That is, the record in the source database will not be synchronized to the target database . Incremental period ,DTS The record in the target cluster will not be retained , That is, the record in the source database will be overwritten in the target database . In case of inconsistent table structure , May result in failure to initialize data 、 Only the data of some columns can be synchronized or the synchronization fails .