Question: How can you clear a distributed cache?
Answer
Clearing a distributed cache typically involves deleting its entries, either one at a time or all at once. The method to do so however depends on the specific caching system you are using. Here are examples for three popular systems: Redis
, Memcached
, and Apache Ignite
.
Redis
To delete all keys from all databases in Redis, you use the FLUSHALL
command.
redis-cli FLUSHALL
If you want to delete all keys from the currently selected database (default is database 0), you use the FLUSHDB
command.
redis-cli FLUSHDB
Memcached
For memcached, you can invalidate all existing cache items using the flush_all
command. Below is an example of how to flush everything from a server running on localhost
on port 11211
.
echo 'flush_all' | nc localhost 11211
This command does not remove items immediately, but rather invalidates them - they will be removed as and when Memcached needs to reclaim memory.
Apache Ignite
With Apache Ignite, you can clear caches with the removeAll()
method, which removes all entries from cache.
IgniteCache cache = ignite.cache("myCache"); cache.removeAll();
Remember that clearing cache should be done carefully, considering its impact on your application's performance and functionality.
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Other Common In Memory Questions (and Answers)
- What is a Distributed Cache and How Can It Be Implemented?
- How do you design a distributed cache system?
- What is a persistent object cache and how can one implement it?
- How can I set up and use Redis as a distributed cache?
- Why should you use a persistent object cache?
- What are the differences between an in-memory cache and a distributed cache?
- What is AWS's In-Memory Data Store Service and how can it be used effectively?
- What is a distributed cache in AWS and how can it be implemented?
- How can you implement Azure distributed cache in your application?
- What is the best distributed cache system?
- Is Redis a distributed cache?
- What is the difference between a replicated cache and a distributed cache?
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