View source for Query execution speed-up: The investigation

A number of potential factors affect the performance of the queries that are executed on the Phenoscape database. These can be classified under a few major categories:

* Hardware: This has to do mainly with the database server configuration
* RDBMS
* Database schema
* Querying strategy

The last category has been discussed at some length in the [[Queries]] page. This page mainly presents the findings in the other categories and proposes possible steps to improve these

==Hardware==

The Phenoscape database is stored on a server running Mac OS Leopard

==Software==

The querying module for the Phenoscape API has been implemented primarily in Java (version 1.5). Much of the code has been inherited from the [http://www.berkeleybop.org/|BBOP]. An extensible Shard interface has been developed by the BBOP team to encapsulate a variety of data repositories ranging from conventional relational databases to RDF triple stores. The Shard interface and the classes that implement it such as the AbstractShard and the OBDSQLShard contain method definitions that can retrieve data from the repositories by executing SQL or more XML based query formats. For the RDBMS-based implementation of the Shard interface, stored procedures have also been developed to both populate the database and query it. 

==RDBMS==

The Phenoscape data is stored in a database that is managed through the PostgreSQL RDBMS (Version 8.3.3). 

==Database Schema==