Avoid MySQL Table Lock Adding Fields

To avoid locking the entire table when adding a field in MySQL using the ALTER TABLE statement, you can use the following method:

1. Adding fields during non-peak hours to minimize impact on other users.
2. Before adding fields, backup the table data to prevent unexpected situations.
3. pt-online-schema-change is a tool used for making online schema changes to MySQL databases without causing downtime.
4. By utilizing master-slave replication, first add fields on the slave database and then perform operations on the master database, in order to minimize the impact on the master database.
5. If the table is too large or the operation is too complex, consider splitting the table into multiple smaller tables and then performing operations on them separately.

In conclusion, when adding fields, it is important to consider the impact on other users and choose the appropriate method to resolve the issue carefully.