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### A.6.11 Virgo-Millennium Simulation Query

Virgo-Millennium load dialogue with an example query on the milli-Millennium database

This dialogue, selected from the Load Window's toolbar button () or the main VO menu, permits direct SQL queries to a family of services hosting cosmological simulation databases. These services were originally developed by GAVO, the German Astrophysical Virtual Observatory, and hold results from the Millennium, Virgo and EAGLE simulations. Options are currently available to query services from MPA Garching and Durham.

To make a query, fill in the fields as required:

Base URL
  This determines the database to be queried. The following options are available:
  Milli-Millennium (`http://gavo.mpa-garching.mpg.de/Millennium`)
    Public simulation results database, containing a fraction of the full simulation results. No username or password is required (the User and Password boxes will be disabled).
  Millennium (`http://gavo.mpa-garching.mpg.de/MyMillennium`)
    Full, protected simulation results database. The username and password must be filled in for these queries (register by application to GAVO).
  VirgoDB (`http://virgodb.dur.ac.uk:8080/MyMillennium`)
    Durham galaxy formation catalogues. Username and password required (register by application to Durham).
  EAGLE (`http://virgodb.dur.ac.uk:8080/Eagle`)
    Durham Eagle database. Username and password required (register by application to Durham).
  Other
    Other services running the similar software can be accessed from this dialogue by entering the relevant base URL here -- users of these services will know what they are. They may or may not require a username and password.
User
Password
  Registration information if required (dependent on base URL as above).
SQL Query
  The text of an SQL query on the database in question.

Then click the OK button, and the query will execute and load the results into TOPCAT. Clicking Cancel while it is in progress will stop it running.

The HaloSamples and GalaxySamples menus provide some examples of queries on the Milli-Millennium database (these have been copied from the GAVO query page). If you select one of these the SQL Query panel will be filled in accordingly.

Much more documentation, including tutorials, descriptions of the database schemas, and information about registering for use of the authenticated services, is available online. The MPA-Garching services are documented at http://gavo.mpa-garching.mpg.de/Millennium/Help, and the Durham services at http://virgodb.dur.ac.uk/.

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TOPCAT - Tool for OPerations on Catalogues And Tables
Starlink User Note253
TOPCAT web page: http://www.starlink.ac.uk/topcat/
Author email: m.b.taylor@bristol.ac.uk
Mailing list: topcat-user@jiscmail.ac.uk