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This article introduces the relevant knowledge of "what is the maximum limit of the number of InnoDB locks". 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!

The number of innodb locks is fixed, and the number of locks in the system is determined at initialization.

Innobase_start_or_create_for_mysql- > lock_sys_create (srv_lock_table_size)-> lock_sys- > rec_hash = hash_create (srv_lock_table_size)

Locks are stored in the hash table of the lock system, which is up to 5 times the number of pages in the system:

Srv_normalize_init_values- > srv_lock_table_size = 5 * (srv_buf_pool_size / UNIV_PAGE_SIZE)

A key value of space and page_ no hash, as the lock label of the data page, obtains the lock structure from the lock_sys- > rec_hash table. When the subsequent page is locked, the lock pointer is obtained from lock_sys- > rec_hash through lock_hash_val, and then the lock structure is created to request memory. Buf_page_get_gen- > block- > lock_hash_val = lock_rec_hash (space, offset)

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