What are the limitations of transactions in Redis?

What are the limitations of transactions in Redis?

Redis transactions, implemented using MULTI, EXEC, WATCH, and DISCARD commands, have some limitations. For instance, they are not truly atomic, meaning that if a command fails, the entire transaction may not roll back.

Can you explain what happens if a command fails during a transaction?

If a command fails during a Redis transaction, the subsequent commands in the transaction will still be executed unless the transaction is aborted with DISCARD. However, the failed command will not be executed.

Are there any isolation levels in Redis transactions?

Redis transactions do not support isolation levels like traditional databases. They provide a simple form of isolation through the WATCH command, which allows you to monitor keys for changes before executing the transaction.

How does the WATCH command work?

The WATCH command allows you to monitor one or more keys. If any of the watched keys are modified before the EXEC command is called, the transaction will be aborted, ensuring that you only execute the transaction if the data hasn't changed.