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https://github.com/methuz/database-blockchain-comparison


https://github.com/methuz/database-blockchain-comparison

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# Database & Blockchain Comparison



| Service | Example | Distributed | Keep Value | Node Consensus | Atomicity | Consistency | Isolation | Durability | Persistency | Integrity | P2P | Trustless | Public Access | Programable | Can  Keep Large Data | Note |

|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|  

| Service Discovery | ETCD, Zookeeper | T | F | T | F | F | F | F | F | T | T | F | F | F | F | Lite distributed database with built-in consensus |

| Traditional/Modern Database | MongoDB, MySQL, Hadoop | Depends | F | Depends | Depends | Depends | Depends | T | T | Depends | Depends | F | F | Depends | T | Most problem solved with them |

| In-memory Database | Redis, Memcache | F | F | F | Depends | T | F | Depends | F | F | F | F | F | F | F | fast/lite temporary database |

| Traditional P2P File Sharing | Bittornt | T | F | F | Undefined** | Undefined** | Undefined** | Undefined** | T | T | T | T | Partial*** | F | T | No transaction/update |

| Version Control System | Git/Git Servers | Partial | F | F | T | Depends | F | T | T | Partial | Partial | F | Depends | Partial | Partial | Depends on Configuration and plugins |

| Traditional Cryptocurrency | Bitcoin | T | T | T | T | T | T | T | T | T | T | T | T | Partial | F | Bitcoin can be programed? Yeah Bitcoin Script |

| Decentralized Application Platform/Crypto 2.0| ETH/EOS and/or etc. | T | T | T | T | T | T | T | T | T | T | T | T | T | F | "Jack of all trade, Master of none" |

| Trust based Cryptocurrency | Stellar | T | T | T | T | T | T | T | T | T | T | F | T | Partial | F | Blockchain + Federation Server |

| Trust-based Distributed Application | Matrix Chat | T | F | F | Undefined** | Undefined** | Undefined** | Undefined** | T | Partial | T | F | T | T | T | Identity Server + Federation Server |

| P2P File System | IPFS | T | F | F | Undefined** | Undefined** | Undefined** | Undefined** | T | T | T | T | Partial*** | F | T | Bittorent with hashed url |

| Private DLT | Hyperledger | T | F | T | T | T | Depends | T | T | T | T | F | F | T | F | You need to know more about security than blockchain to use it |



** Undefined since there is no transaction or updating function

*** Partial depends on how file host let people to discover



## What are all these mean? (in TLDR form)

### Distributed

Data can be distributed (replicated) across multiple node



### Keep Value

It can contains value in economic sense.



### Node Consensus

There is a mechanism that allow all node to agree upon some fact, such as Who is the leader of the cluster? What's the latest state of the data.



### Atomicity

Half done transaction shall not possible.



### Consistency

No illegal (In Computer Science sense) transaction can be stored. But it does not mean the data is logically correct (in application sense)



### Isolation

If there are more than one transaction submitted at the same time, Service shall treat them as one after another.



### Durability

Transaction must be written on harddisk to prevent stored data from missing.



### Persistency

Similar to durability but not only limited to transaction, Data must not be erased unless it is really meant to be deleted.



### Integrity

All node always contains and return the same data.



### P2P

Node talk to another node on their own, No master needed.



### Trustless

Need trust to interact, share data with.



### Public Access

Anyone in the world can look at the data



### Programable

Turing complete = T



### Note

My comment