1. On the current basis, it is necessary to add lower_case_table_names=1 to my.conf and the other four /alidata/server/mysql/conf/*.conf to solve the case problem of table names encountered by mycat when modifying large tables ; Then execute 4. of mycat.offline.bin.
2. Mycat/conf/rule.xml schema.xml needs to manually add rule and schema, but cannot be replaced directly like mycattype=2. The first rule in the rule is different from the latest sub-library rule and date; The ip in the schema.xml is also different.
3. Many missing updates encountered should be made up by yourself. So is large upate. After a round of revision, after testing on 187, there should be no problems.
4. Ordinary mycattype=1,2 can be upgraded directly. But 1 may be done; but Xianju’s 4 mode requires the order of 1, 2, and 3.