Aiven for Valkey vs Memcached

Aiven for Valkey is a managed in-memory key/value datastore for real-time workloads, including caching, message queuing, session storage, retrieval-augmented generation, and real-time analytics. The product page identifies Valkey 9.1 as its current version. Valkey 9 and later services include Bloom and Search modules by default; Search handles vector, full-text, numeric, and tag queries. Aiven documents compatibility with Redis OSS 7.2.4 and migration support from Redis implementations and Valkey databases. Customers can manage the service through Aiven Console, CLI, API, or Terraform. Aiven advertises a 99.99% uptime SLA, automatic failover, and backups every 12 hours on applicable plans. Security options include encryption in transit and at rest, SSO/SAML, and VPC peering. The free plan has one node, 1 CPU, and 1 GB RAM, but excludes integrations, support services, VPCs, static IPs, and the 99.99% SLA. Pricing includes a free plan, paid plans from $15/mo, and a 30-day trial.

Memcached is a free, self-hosted in-memory key-value cache for reducing database load in dynamic web applications. It keeps small chunks of arbitrary data, such as strings, objects, and results from database calls, API calls, or page rendering. Clients use key-based hashing to choose a server, while servers operate independently without synchronization or replication. Items can expire after a specified time, and the default eviction policy is least recently used (LRU). The project describes Memcached as a developer tool, not code acceleration software or database middleware. Its API is available for most popular languages, and downloads include a source tarball and installation instructions with package prerequisites for Debian/Ubuntu and Red Hat/CentOS. TLS authentication and encryption are supported in version 1.5.13 and later when built with TLS and used with a TLS-capable client. Optional extstore moves values to external storage while keeping keys and the hash table in memory; it needs version 1.6.0 or newer. The project began in 2003. It is free and self-hosted, with no hosted plan or price listed.