dummy crud database

Description

I always wanted to make simple database so I made one only for educational purposes inspired by this javaworld article

It can store any binary data. Implemented in python in under 250 lines of code.
Probably can be shorter but it's just a gig.

Supports

• insert data
• update data
• delete data
• read data by index
• read all data

For simplicity data and index files is append only.
Index file is loaded and stored as dictionary in memory on start.

Dependencies

Optional psutil to display pid statistics when running main file.

Run

I tested it using python3.7 but it can be easily converted to any python version or any language

By default it :

• removes 2 files test.db, test.index if those files exists
• create 2 files test.db, test.index
• writes and index 1 million random string with characters between (100, 1000) to test.db file (around 540MB)
• reads 1 million random elements from file (around 8MB)
• performs read of object at position 2
• remove object from position 3
• update object at position 2

python dummy_crud_database.py 

Output

Test elements size 1000000
write elements in 35.61809206008911s - 28075.61950013945 per second
read elements in 13.677339792251587s - 73113.63285472477 per second
size :  1000000
database fsize :  539.06 MB
index fsize :  7.63 MB

So it looks like it can do 1,4k inserts per second and around 26k reads per second on my computer (write time including random choice from 1k elements array).