SET / GET
Put a value in RAM and retrieve it by key. A missing key returns NULL.
live documentation
Python · zero dependencies
Database you can touch.
GhostDB turns transactions into a hands-on experiment: enter commands, change memory state, and watch exactly what COMMIT or ROLLBACK does.
0 filesRAM only
∞ layersnested transactions
9 cmdssmall API
ghostdb / runtime
DB
in memory
in memory
commandSET A 10process()
transactionT2 · activesnapshot: A
statedb = { A: 10 }
01 · interactive lab
Explore the state
This browser-based mirror of `cli.py` keeps the console, memory, counters, and transaction stack in sync.
02 · small surface area
Commands without noise
One command, one idea. Read the implementation and test its behavior in the lab above.
FIND / COUNTS
Find every key with a value or count how many times that value appears.
ROLLBACK
Return the active layer to its snapshot without touching the parent transaction.
COMMIT
Confirm a layer or pass its original values up to the parent layer.
03 · under the hood
Snapshot on first change
When a transaction changes a key for the first time, GhostDB saves its previous value in the current layer. Then ROLLBACK restores the snapshot, while COMMIT moves the history to the outer layer.
01
BEGINAdds a new empty layer.
02
SET / UNSETSaves a key's old value once.
03
COMMIT / ROLLBACKApplies changes or rebuilds the previous state.
01transactions = []
02BEGIN → T1
03SET A 10
04BEGIN → T2
05SET A 20 # snapshot A=10
06ROLLBACK # A ← 10
07COMMIT # T1 applied
08// nothing persisted to disk