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Adminer (formerly phpMinAdmin) is a full-featured database management tool written in PHP. Conversely to phpMyAdmin, it consist of a single file ready to deploy to the target server. Adminer is available for MySQL, PostgreSQL, SQLite, MS SQL, Oracle, SimpleDB, Elasticsearch and MongoDB
Maatkit is a toolkit for users, developers, and administrators of open-source databases. Most of Maatkit’s functionality is designed for MySQL. It makes MySQL easier and safer to manage. Maatkit could be used to prove replication is working correctly, fix corrupted data, automate repetitive tasks, speed up your servers, and much more.
pgAdmin is the most popular and feature rich administration and development platform for PostgreSQL. It is designed to answer the needs of all users, from writing simple SQL queries to developing complex databases. The graphical interface supports all PostgreSQL features and makes administration easy. The application also includes a syntax highlighting SQL editor, a server-side code editor, an SQL/batch/shell job scheduling agent, support for the Slony-I replication engine and much more.
pgpool-II is a middleware that works between PostgreSQL servers and a PostgreSQL database client. It supports connection pooling, Using the replication function enables creating a realtime backup on 2 or more physical disks, so that the service can continue without stopping servers in case of a disk failure, Load balance the queries, It can execute queries in parallel to multiple servers.
SQL Workbench is a DBMS-independent, cross-platform SQL query tool. Its main focus is on running SQL scripts (either interactively or as a batch) and export/import features. It could compare the data of two database and generate the necessary SQL statements to migrate one to the other.
The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model. Cassandra is suitable for applications that can't afford to lose data. Data is automatically replicated to multiple nodes for fault-tolerance.
Voldemort is a distributed key-value storage system. Data is automatically replicated over multiple servers. Data is automatically partitioned so each server contains only a subset of the total data.
Server failure is handled transparently. It is used at LinkedIn for certain high-scalability storage problems where simple functional partitioning is not sufficient.
HBase provides support to handle BigTable - billions of rows X millions of columns. It is a scalable, distributed, versioned, column-oriented store modeled after Google's Bigtable and runs on top of HDFS (Hadoop Distributed Filesystem). It features compression, in-memory operation per-column. Data could be replicated between the nodes. HBase is used in Facebook and Twitter.
CUBRID is a relational database management system highly optimized for Web Applications, especially when complex web services process large amount of data and generate huge concurrent requests. CUBRID is being developed in C/C++. Includes HA, online incremental backup, Replication, Load balancing, Sharding, Caching and other features. It supports JDBC, PHP, ODBC/.NET, Ruby & Python APIs.