SmallDB - sample in-memory storage engine for MySQL
Supports basic CRUD operations, data is stored in a linked list

Installation requires MySQL source code(same as installed version)
Following example is for MySQL Community 5.5.35

1. Download & untar MySQL source code

  wget http:https://downloads.mysql.com/archives/get/file/mysql-5.5.35.tar.gz
  tar -zxvf mysql-5.5.35.tar.gz

2. Clone smalldb into mysql-5.5.35/storage/smalldb directory

  cd mysql-5.5.35
  git clone https://github.com/aboev/smalldb.git storage/smalldb

3. Run cmake

  cmake .

4. (Optional) Install & run MySQL if you don't have one. Please follow instructions on http:https://dev.mysql.com/doc/refman/5.6/en/installing-source-distribution.html for post-install setup

  make  
  make install

5. Compile smalldb

  cd storage/smalldb  
  make

5. Copy smalldb.so file into MySQL plugin directory (You can check plugin directory through: SHOW VARIABLES LIKE "%plugin_dir%";)

  cp ha_smalldb.so /opt/mysql/server-5.5.35/lib/plugin/

6. Install smalldb

  mysql -u root -p -e 'INSTALL PLUGIN smalldb soname "ha_smalldb.so";'

Now you can define smalldb as storage engine:

CREATE TABLE tbl (col VARCHAR(255)) ENGINE = smalldb;