Checking Whether the Index Length of the Source Database Exceeds the Limit

**Table 1** Checking whether the index length of the source database exceeds the limit
Check Item	Whether the index length of the source database exceeds the limit
Description	The migration fails because the index length of the source database exceeds the column length limit of the destination database.
Failure Cause and Handling Suggestion	Failure cause: There are indexes in the source database exceed the column length limit of the destination database. Handling suggestion: 1. Delete the tables from the migration object. 2. Modify the index length.

**Table 2** Checking whether the index length of the source database exceeds the column length limit
Check Item	Whether the index length of the source database exceeds the limit
Description	The migration fails because the index length of the source database exceeds the column length limit of the destination database.
Failure Cause and Handling Suggestion	Failure cause: There are indexes in the source database exceed the column length limit of the destination database. Handling suggestion: Set innodb_large_prefix of the destination database to ON, or return to the previous step and select the table to be migrated again.