Limitations and considerations

The following limitations apply:

Due to the way MySQL operates, when loading data to a Google Cloud SQL for MySQL target during a Full Load task, duplicate key errors will not be reported to the logs.
When updating a column's value to its existing value, a zero rows affected is returned from MySQL (unlike Oracle and Microsoft SQL Server that perform an update of one row). This generates an entry in the attrep_apply_exceptions control table and the following warning:

Some changes from the source database had no impact when applied to the target database. See attrep_apply_exceptions table for details.
Due to an issue with MySQL 5.7 (which was resolved in version 8.0), Replicate cannot insert multibyte characters into TEXT columns when the Full Load uses CSV files. Consequently, if the target endpoint is MySQL 5.7 and a replicated table contains TEXT columns with UTF-8 multibyte characters, the target table might be empty.

Workaround:

In the Advanced tab, set the loadUsingCSV internal parameter to FALSE. Note that this might impact performance.
If you need to replicate 4-byte emoji characters, the target schema character set must be set to utf8mb4.

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