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12 февраля 2016 г., 18:56
The most basic locking strategy available in MySQL, and the one with the lowest overhead, is table locks. A table lock is analogous to the mailbox locks described earlier: it locks the entire table. When a client wishes to write to a table (insert, delete, update, etc.), it acquires a write lock. This keeps all other read and write operations at bay. When nobody is writing, readers can obtain read locks, which don’t conflict with other read locks.
