What it is
An ultra-fast data store that lives in the server's memory.
How we use it
For caching (so the main database isn't hit on every request) and task queues — for example, sending messages in the background.
Databases
What is Redis
Where it helps a business
- An employee was filling in a ticket in the bot, the bot restarted, and everything had to start over.
- A website fetches the same data from the database every time and slows down.
- Sign-in sessions need to be stored quickly and separately from the main database.
How we use it
- Dialogues that survive a restart. In the IT help desk unfinished dialogues live in Redis rather than in the bot's memory, so a restart does not cut them off.
- Cache and sessions. In the online store Redis 7 holds the cache and sessions, in a separate container next to the database.
Common problems
- Without Redis, states are lost. In the birthday bot and the electronic queue dialogues live in memory and break off on restart; in ToshaMusic moving states to Redis is on the roadmap.
When you do not need it
A small bot with short dialogues and rare restarts does not need Redis: losing an unfinished dialogue costs nothing.
Where we used it
Related services
More in "Databases"
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