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In PHP programming, the database deadlock problem is a frequently encountered situation. It will cause abnormalities in the operation of the program and affect the performance and stability of the system. Therefore, we need to deeply explore the causes of database deadlock problems and take targeted optimization measures on this basis to improve the efficiency and stability of the program. This article will introduce the troubleshooting and optimization of database deadlock problems from the following aspects:
1. What is a database deadlock?
In the MySQL database, locks are divided into two types: shared locks and exclusive locks. Shared locks are locks used during read operations, which allow other transactions to use shared locks to access data, while exclusive locks are locks used during write operations, because generally database read operations are concurrent, so write operations need to be Exclusive locking prevents multiple transactions from writing to the same data, causing data conflicts and confusion.
Database deadlock refers to the resource competition problem caused by other sessions needing to acquire the same data lock when a certain session holds a data lock. A permanent lock competition situation occurs when two or more transactions wait for each other to release the lock, causing the program to be blocked and unable to continue execution.
2. Causes of database deadlock
3. Optimization of database deadlock problems
4. Summary
In PHP programming, the database deadlock problem is a common situation and has a great impact on the performance and stability of the system. Therefore, we must take the deadlock problem seriously and take appropriate optimization measures to avoid its occurrence. Specifically, we can eliminate deadlock problems and achieve efficient and stable operation of the program by optimizing transaction processing, reasonably setting lock waiting times, and optimizing program logic.
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