mysql locks
1. Internal Locking:
- What it is: Imagine you have a toy box, and only one person can play with it at a time. Internal locking in MySQL is like the toy box having a rule that only one kid can play with the toys inside at any given moment.
- How it works: MySQL keeps track of who is using which data, so if one person is making changes, it tells others to wait their turn.
2. Table-Level Locking:
- What it is: This is like having a big library with only one table, and only one person can enter the library at a time. So, if you want to read a book, but someone else is inside, you have to wait outside.
- How it works: MySQL locks the entire table when someone is using it for writing, and others have to wait. This can be a bit like waiting in line.
3. Row-Level Locking:
- What it is: Imagine a library where each bookshelf has its own lock. Row-level locking in MySQL is like this. If one person is reading one book, it doesn't stop others from reading different books on the same shelf.
- How it works: MySQL only locks the specific row (or book) that someone is using, so others can access different rows (or books) at the same time.
4. External Locking:
- What it is: Think of external locking like a group of friends playing a board game. They have their own rules and ways to decide who gets to make the next move.
- How it works: Instead of MySQL managing the locks, your program code decides when to lock and unlock data. It's like you and your friends deciding when it's your turn to play.
5. Deadlock:
- What it is: Imagine two friends in a game, both holding a toy they need from each other to continue playing. They're stuck because neither wants to give up their toy.
- How it works: In MySQL, a deadlock happens when two or more actions are waiting for each other, and nobody can continue. It's like a standstill in a game until someone makes a move.
Remember, these locking mechanisms are important in MySQL to make sure everyone can use the database without causing conflicts or getting stuck. Just like in real life, it's essential to play nicely and take turns!