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Document the building process.

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Authors: Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)
# Features
* Keys and values are arbitrary byte arrays.
* Data is stored sorted by key.
* Callers can provide a custom comparison function to override the sort order.
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* External activity (file system operations etc.) is relayed through a virtual interface so users can customize the operating system interactions.
# Documentation
[LevelDB library documentation](https://github.com/google/leveldb/blob/master/doc/index.md) is online and bundled with the source code.
# Limitations
* This is not a SQL database. It does not have a relational data model, it does not support SQL queries, and it has no support for indexes.
* Only a single process (possibly multi-threaded) can access a particular database at a time.
* There is no client-server support builtin to the library. An application that needs such support will have to wrap their own server around the library.
# Building
This project supports [CMake](https://cmake.org/) out of the box.
Quick start:
```bash
mkdir -p build && cd build
cmake -DCMAKE_BUILD_TYPE=Release .. && cmake --build .
```
Please see the CMake documentation and `CMakeLists.txt` for more advanced usage.
# Contributing to the leveldb Project
The leveldb project welcomes contributions. leveldb's primary goal is to be
a reliable and fast key/value store. Changes that are in line with the
features/limitations outlined above, and meet the requirements below,
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a sufficient explanation as to why a new (or changed) test is not required.
## Submitting a Pull Request
Before any pull request will be accepted the author must first sign a
Contributor License Agreement (CLA) at https://cla.developers.google.com/.