Kechen's implementation of a relational database, skeleton codes forked from MIT 6.830.
MyDB supports these features:
- Storage and Bufferpool Management: Implemented efficient storage and bufferpool management, including an LRU Replacement Policy, to optimize data retrieval and storage architecture.
- Query Execution: Implemented Sequential Scan, Filer, Join, Aggregation, Insert, and Deletion Operator using Iterator.
- Optimization: Applied cost-based optimization techniques, improving query efficiency by calculating cardinality and selectivity.
- Indexing with B+ Tree: Employed B+ tree indexing to enhance data access performance, ensuring rapid retrieval of data.
- Transaction Control: Achieved the ACID features of transactions through the writer-reader model and Two-Phase Locking. Implemented a timestamp-based Deadlock detection algorithm.
- Logging: Implemented STEAL and NON-FORCE policies, enabling checkpoint, rollback, and recovery features.
settings -> Project structure -> Project settings -> SDK Specify a lower version SDK(i.e. java 20)
settings -> Project structure -> Project settings -> SDK Specify a lower version SDK(i.e. java 16)
in ant build, here says the java version:
<property name="sourceversion" value="1.8"/>
- Build jar
use ant build to build the jar package - Once get the jar, rememer to config IDEA rather than use command line!
Reference from lab2.md:
We've provided you with a query parser for SimpleDB that you can use to write and run SQL queries against your database once you have completed the exercises in this lab.
The first step is to create some data tables and a catalog. Suppose you have a file data.txt in side the data folder with the following
contents:
1,10
2,20
3,30
4,40
5,50
5,50
You can convert this into a SimpleDB table using the
convert command (make sure to type ant first!):
java -jar dist/simpledb.jar convert data/data.txt 2 "int,int"
This creates a file data.dat. In addition to the table's raw data, the two additional parameters specify that each
record has two fields and that their types are int and
int.
Next, create a catalog file, catalog.txt, with the following contents:
data (f1 int, f2 int)
This tells SimpleDB that there is one table, data (stored in
data.dat) with two integer fields named f1
and f2.
Finally, invoke the parser. You must run java from the command line (ant doesn't work properly with interactive
targets.)
From the simpledb/ directory, type:
java -jar dist/simpledb.jar parser data/catalog.txt
You should see output like:
Added table : data with schema INT(f1), INT(f2),
SimpleDB>
Finally, you can run a query:
SimpleDB> select d.f1, d.f2 from data d;
Started a new transaction tid = 1221852405823
ADDING TABLE d(data) TO tableMap
TABLE HAS tupleDesc INT(d.f1), INT(d.f2),
1 10
2 20
3 30
4 40
5 50
5 50
6 rows.
----------------
0.16 seconds
SimpleDB>
My study notes for CMU 15445:
https://drive.google.com/file/d/14RguZaOPNdGTMTlmW-96zsXMiqnbwPeT/view?usp=drive_link