komu / Ahwen
Licence: mit
A simple SQL database
Stars: ✭ 66
Programming Languages
kotlin
9241 projects
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Ahwen
A really simple SQL database.
Layers
A good way to understand the system is to start from the lowest level layers and build your way up from there. The layers are listed here in that order:
-
file- read pages from disk and write them back to disk -
log- read and write log records -
buffer- maintain a cache of frequently accessed pages -
tx.recovery- provide durability for changes -
tx.concurrency- implement locking needed to guarantee atomicity for changes -
tx- tie recovery and concurrency properties together -
record- provide structure on top of raw pages to represent database records -
metadata- maintain metadata about structure of different database objects -
query- queries and query plans expressed in relational algebra -
parse- parsing SQL statements -
planner- translate parsed SQL trees into relational algebra -
jdbc- JDBC wrapper on top of everything else
Credits
The implementation takes heavy inspiration from Edward Sciore's SimpleDB, augmented by implementations of various exercises in his textbook Database Design and Implementation.
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