ACID Transactions Visualization
Step through the four ACID guarantees — Atomicity, Consistency, Isolation, Durability — with undo/redo logging, 2PL and MVCC isolation, isolation levels, and ARIES crash recovery.
Databases
See how databases organize, cache, and retrieve data — from B-Tree indexing and sorted sets to caching strategies and session management.
14 guides 8 visualizations 6 simulators
Visualizations 8 visualizations
Database Replication WAL and Failover Visualization
Step through primary-standby database replication, WAL streaming, replica lag, synchronous commit, failover, split-brain risk, and recovery.
Database Sharding Lifecycle Visualization
Walk through the Database Sharding lifecycle with guided steps for hash sharding, range sharding, scatter-gather, hotspot, rebalance.
Redis Architecture
A comprehensive deep-dive into Redis internals: caching strategies, data structures, single-threaded execution, pipelining, persistence (RDB & AOF), replication, failover
Redis Caching Patterns
Visualize cache-aside, read-through, write-through, and write-behind caching patterns. See how Redis sits between your application and database to accelerate reads.
Redis Cluster Failover Lifecycle Visualization
Walk through native Redis Cluster failover: cluster-bus PFAIL and FAIL reports, master authorization, config epochs, and MOVED recovery.
Session Management with Redis
Learn how Redis manages user sessions across distributed web servers. See session creation, retrieval, expiration, and how sticky sessions differ from shared session stores.
SQL Query Executor: Volcano Iterator Model
Understand the pull-based Volcano iterator execution model in SQL engines. Walk through open(), next(), and close() interfaces, see pipeline breakers like Hash Join
Simulators 6 simulators
ACID Isolation Locking Lab
Simulate a checkout race to see how ACID isolation, row locks, table locks, MVCC snapshots, range locks, and serializable retries keep database state correct.
Cache Invalidation Strategies Simulator
Simulate different cache invalidation strategies side-by-side. Watch how write-through, write-behind, cache-aside, and TTL-based invalidation handle reads, writes
Database Connection Pool Simulator
Simulate a database connection pool managing connections between application threads and a database. Watch connections get checked out, used, and returned. Experiment with pool sizing
Redis Crash & Cache Stampede
Simulate what happens when Redis crashes: cache timeouts, database fallback, cache stampede pressure, rising latency, 5xx errors, and recovery after Redis restarts cold.
Surviving a Redis Crash
Walk through a Redis crash from healthy reads to degraded fallback, DB protection, circuit breaking, L1 hot keys, replica failover, gradual warm-up, and cache-optional correctness.
Tunable DB Consistency Simulator
Simulate tunable read/write consistency levels (One, Quorum, All) in a Dynamo-style replicated database ring. Slice network connections to create partitions, execute operations