Check requirements: check the following parameter values of the source and target databases. If a parameter has different values in the source database and target database, a verification warning will be reported, which will not block the migration task but will affect the business. You need to assess and determine whether to modify the parameter.
TimeZone, lc_monetary, lc_numeric, array_nulls, server_encoding, DateStyle, extra_float_digits, gin_fuzzy_search_limit, xmlbinary, and constraint_exclusion.
Impact on the business: if the parameter values are different, data inconsistency between the source and target databases may be caused. Below is the specific impact:
server_encodingparameter cannot be modified in the source database. If it is exceptional, check whether it has been created in the target database, and if so and it is different from that in the source database, you need to apply for a new instance; and if not, modify it as follows (currently, TencentDB instances only support two character sets: UTF-8 and LATIN):
alter system set timezone='parameter value'; alter system set lc_monetary='parameter value'; alter system set lc_numeric='parameter value';