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Is Cassandra an in-memory database?
A fundamental limitation of Cassandra is that it is disk-based, not an in-memory database. This means that read performance is always capped by I/O specifications, ultimately restricting application performance and limiting the ability to attain an acceptable user experience.
How much RAM does Cassandra need?
While Cassandra can be made to run on small servers for testing or development environments (including Raspberry Pis), a minimal production server requires at least 2 cores, and at least 8GB of RAM. Typical production servers have 8 or more cores and at least 32GB of RAM.
Is Cassandra good for caching?
Cassandra’s built-in key and row caches can provide very efficient data caching. With proper tuning, hit rates of 85% or better are possible with Cassandra, and each hit on a key cache can save one disk seek per SSTable.
What is Cassandra database good for?
Cassandra is one of the most efficient and widely-used NoSQL databases. Another key benefit of Cassandra is the massive volume of data that the system can handle. It can effectively and efficiently handle huge amounts of data across multiple servers.
Is Cassandra a memory or disk?
Cassandra relies on the kernel file system cache for optimizing reads. Recent and frequently used files are kept in the memory cache. It would be impractical to keep all of the hundreds of GBs of metric data Cassandra stores in memory at scale. Therefore, it is impossible to completely eliminate disk reads.
Does Cassandra cache data?
Cassandra includes integrated caching and distributes cache data around the cluster. The integrated architecture facilitates troubleshooting and the cold start problem. Cassandra includes integrated caching and distributes cache data around the cluster.
How much data can Cassandra handle?
Cassandra has limitations when it comes to the partition size and number of values: 100 MB and 2 billion respectively. So if your table contains too many columns, values or is too big in size, you won’t be able to read it quickly. Or even won’t be able to read it at all. And this is something to keep in mind.