before 5.6, DDL has 2 implementations: COPY and INPLACE(INPLACE is just for index add and remove); in 5.6, online DDL is introduced; online DDL also has COPY and INPLACE implementations, so online DDL ...

There was an error while loading. Please reload this page. There are row-level locks and table-level locks. If you don't explicitly lock tables, you don't need to ...