112 lines
4.7 KiB
Markdown
112 lines
4.7 KiB
Markdown
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BeeDB is a software project that teaches students the architecture and implementation of DataBase Management Systems.
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This project is related to the Basic Module *Architecture & Implementation of DBMS*. The course is usually teached every summer term, see [dbis page of TU Dortmund](http://dbis.cs.tu-dortmund.de/cms/en/teaching/index.html) for more information.
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**Attention: Please do not publish and share your solution with other students!**
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## Dependencies
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* `git`
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* `cmake` (at least version `3.9`)
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* `build-essential`
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* `bison` and `flex` (and in Ubuntu the package `libfl-dev`)
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## How to build
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### Option (a): Build into current folder:
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* `cmake .`
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* `make`
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### Option (b): Build into separate `build` folder:
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* `mkdir build && cd build`
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* `cmake ..`
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* `make`
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### Switch between `Release` and `Debug`modes
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* Default build is in `Debug` mode.
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* If you want to build in `Release` mode use:
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* `cmake . -DCMAKE_BUILD_TYPE=Release`
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* **or** set `CMAKE_BUILD_TYPE` in `CMakeLists.txt`.
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## How to use
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BeeDB uses a client/server model where the executable `beedb` starts the server and `beedb_client` runs a client.
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### Server
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Usage: beedb [options] db-file
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Positional arguments:
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db-file File the database is stored in. Default: bee.db
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Optional arguments:
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-h --help show this help message and exit
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-p --port Port of the server
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-l --load Load SQL file into database.
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-q --query Execute Query.
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-cmd --custom_command Execute custom command and exit right after.
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-k --keep Keep server running after executing query, command or loading a file.
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-c --client Start an additional client next to the server
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--buffer-manager-frames Number of frames within the frame buffer.
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--scan-page-limit Number of pages the SCAN operator can pin at a time.
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--enable-index-scan Enable index scan and use whenever possible.
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--enable-hash-join Enable hash join and use whenever possible.
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--enable-predicate-push-down Enable predicate push down and use whenever possible.
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--stats Print all execution statistics
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### Client
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Usage: beedb_client [options] host
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Positional arguments:
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host Name or IP of the beedb server
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Optional arguments:
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-h --help show this help message and exit
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-p --port Port of the server
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### Please note!
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Just stopping the server by killing (or `Ctrl-C`) crashes the server; you may loose (unflushed) data.
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To stop the server clean, use `:stop` command by a client.
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## Configuration
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Some configuration outside the console arguments is stored in the file `beedb.ini`.
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* The number of pages stored as frames in the buffer manager (`buffer manager.frames`)
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* The replacement strategy of frames in the buffer manager (`buffer manager.strategy`)
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* The `k` parameter for `LRU-K` replacement strategy (`buffer manager.k`)
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* The number of how many pages can be pinned by a scan at a time (`scan.page-limit`)
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* Enable or disable usage of index scan (`optimizer.enable-index-scan`)
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* Enable or disable usage of hash join (`optimizer.enable-hash-join`)
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* Enable or disable predicate push down (`optimizer.enable-predicate-push-down`)
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## Non-SQL Commands
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Despite SQL commands, you can use the following special commands from the client.
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* `:explain <query>`: prints the query plan, either as a table or a graph (a list of nodes and edges)
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* `:get <option-name>`: prints either all or the secified option of the database configuration
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* `:set <option-name> <numerical-value>`: changes the specified option. Only numerical values are valid
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* `:show [tables,indices,columns]`: A quick way to show available tables, their columns or indices
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* `:stop`: Stops the server (and flushes all data to the disk).
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## Examples
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##### Import and SQL file (containing `CREATE` and `INSERT`)
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`./beedb -l movies.sql`
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##### Run a single query and terminate
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`./beedb -q "SELECT * FROM movie;"`
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##### Run a query and open console afterwards
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`./beedb -q "SELECT * FROM movie;" -c`
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##### Start the BeeDB server only (connect clients later)
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`./beedb`
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##### Start the BeeDB server and open a client console
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`./beedb -c`
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#### Start a BeeDB client (you can start multiple ones)
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`./beedb_client`
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# For developers
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* If you want to commit to the repository please `make git-hook` before commit.
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# Credits
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* Thanks to **p-ranav** for `argparse` (MIT license, [See on GitHub](https://github.com/p-ranav/argparse)).
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* Thanks to **antirez** for `linenoise` (BSD license, [See on Github](https://github.com/antirez/linenoise)).
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* Thanks to **nlohmann** and further contributors for `nlohmann_json` (MIT license, [See on GitHub](https://github.com/nlohmann/json)). |