1. Enabling Grids for E-sciencE EGEE-III INFSO-RI-222667 1 I. AMGA Overview What is AMGA Metadata Catalogue of EGEE’s gLite 3.1 Middleware Main Feature of AMGA Modular back-end : Oracle, PostgreSQL, MySQL, SQLite Modular front-end : TCP Streaming, WS-DAIR (SOAP) TCP Streaming WS-DAIR (SOAP) MD Server Oracle Postgre SQL MySQL SQLite AMGA Metadata Server Client

2. Enabling Grids for E-sciencE EGEE-III INFSO-RI-222667 2 I. AMGA Overview Main Features of AMGA Integration with Grid Security : Grid proxy authentication and VOMS authorization Secure client connection using SSL Replication – Metadata collections can be replicated to improve reliability, scalability and performance, considering security issues Native SQL Query & AMGA Language Query

3. Enabling Grids for E-sciencE EGEE-III INFSO-RI-222667 3 II. AMGA WS-DAIR AMGA WS-DAIR (SOAP) Front-end Greatly improve the extensibility and interoperability with other Data access services Full use of the advanced security features of AMGA, namely access through the GSI and VOMS. Interoperability : Reference Implementation of OGF WS-DAIR –Participate in Experience documentation of WS-DAI & WS-DAIR Implementation –Interoperable with the OGSA-DAI WS-DAIR implementation Supported Dataset Format : SUN JDBC WebRowSet Supported Language : SQL-92 Direct Data Statement, AMGA Metadata Language

4. Enabling Grids for E-sciencE EGEE-III INFSO-RI-222667 4 II. AMGA WS-DAIR AMGA WS-DAIR Performance Study : Throughput Testing Environment (Direct Data Access) –DB : the simulation table used for the WISDOM (Grid-enabled drug discovery) project –One row with two attributes was retrieved by each query Results –Little difference between TCP/IP streaming and WS-DAIR SOAP –Maximum Throughput : about 1,400 queries / sec