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This article introduces the relevant knowledge of "MySQL 5.7Thread Analysis from the system lock Library". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

System lock

This thread is called by mysql_lock_tables (). This state may be caused by a variety of reasons.

For example, a thread wants to request or is waiting for an internal or external system lock of a table

It is also possible that InnoDB waits for table-level locks when executing lock tables.

It is also possible to request an internal lock, such as accessing the same MyISM table without using multiple mysqld services

In this case, you can disable the internal system locks with the-- skip-external-locking option. However, if internal locks are disabled by default, that option will be useless.

If you encounter this state during show profile, the thread is requesting a lock (not etc.).

This is the end of the content of "MySQL 5.7Thread Analysis from the Library system lock". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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