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The DBD::Mock perl module is a simple mock DBD implementation used for testing. It's entirely self-contained so that you can extract the single library file (DBD/Mock.pm), put it in your own distribution and be able to run DBI-based tests even though you don't have information about a database.

DBD::PgPP is a Pure Perl client interface for the PostgreSQL database. It implements the PostgreSQL client/server network protocol and doesn't need an external PostgreSQL client library like "libpq" for it to work. Consequently, it allows one to connect to a PostgreSQL server from operating systems to which PostgreSQL has not been ported.

This module automatically inflates/deflates DateTime objects corresponding to applicable columns. Columns may also be defined to specify their nature, such as columns representing a creation time (set at time of insertion) or a modification time (set at time of every update).

DBIx::Class::Schema::Config is a subclass of DBIx::Class::Schema that allows the loading of credentials from a file. The actual code itself would only need to know about the name used in the configuration file. This aims to make it simpler for operations teams to manage database credentials.

This module provides a synchronous and asynchronous driver for Tarantool. The driver does not have external dependencies, but includes the official light-weight Tarantool C client (a single C header which implements all protocol formatting) for packing requests and unpacking server responses.

This module allows use of the CQL3 interface of a Cassandra database. It fully supports asynchronous operation via IO::Async, allowing both direct queries and prepared statements to be managed concurrently, if required. Alternatively, as the interface is entirely based on Future objects, it can be operated synchronously in a blocking fashion by simply awaiting each individual operation by calling the get method.

Tie::LevelDB is the Perl Interface for Google NoSQL database called LevelDB. See http://code.google.com/p/leveldb/ for more details. Interface is implemented both as a reflection of an original LevelDB C++ API and a Perl-ish TIEHASH mechanism.

PEAR MDB is a merge of the PEAR DB and Metabase php database abstraction layers. It provides a common API for all support RDBMS. The main difference to most other DB abstraction packages is that MDB goes much further to ensure portability. Currently supported RDBMS are MySQL, PostGreSQL, Oracle, Frontbase, Querysim, Interbase/Firebird, and MSSQL

PEAR MDB2 is a merge of the PEAR DB and Metabase php database abstraction layers. It provides a common API for all supported RDBMS. The main difference to most other DB abstraction packages is that MDB2 goes much further to ensure portability. MDB2 provides most of its many features optionally that can be used to construct portable SQL statements.

Percona Toolkit is a collection of advanced command-line tools used by Percona support staff to perform a variety of MySQL and system tasks that are too difficult or complex to perform manually, including: Verify master and replica data consistency Efficiently archive rows Find duplicate indexes Summarize MySQL servers Analyze queries from logs and tcpdump Collect vital system information when problems occur