4/4/2023 0 Comments Exif online tool![]() This will become a lot more apparent in our first example where we’re going to cover the online DDL method using the instant algorithm. ![]() In order for MySQL to establish this lock it has to wait for any query against the table in question to finish, and in turn, any query on the table that occurs after the lock request has to wait for the long-running query and the lock to process before continuing. ![]() In doing so we will see that all these tools will require metadata locks, but knowing more about how they work and how the use locking can help us determine the right tool for your specific use case.Īny time you make a change to a table a metadata lock is needed to ensure consistency between the table itself and MySQL’s data dictionary. That said, it’s still worth it to examine how metadata locks work and what the impact is for each of the common tools and processes. I agree that metadata locks can be painful, but unfortunately, it’s completely unavoidable, and changing from one tool to another won’t help with this. One thing I commonly hear when working with my clients is “I want to change my DDL strategy in order to avoid locking in my database! The last time I used the same old method I ended up in a metadata lock situation!”
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