Context in practice

1
Context in practice

• and whats new
• Lorentz center, Wednesday, 21 November 2006

2
Context

• Handling large amounts of data
• Work together
• Work in a consistent way
• Experiment with source code
• Know what data and code was used
• Keep data private
• Make data public
• Throw away data

3
Projects

• Organize in Projects, that have
• A name and description
• Users
• Default privileges
• Responsible - privileged users
• New objects are automatically part of the
  currently active context

4
Privileges

• User Project Astro-Wise
• MyDB
• Project with same name as user
• User-only objects within a project, i.e.user can
  see all data within a projectbut creates data
  that is invisible to others within a
  projectcontext.set_privileges_user_only()contex
  t.set_privileges_project_only()context.set_defaul
  t_privileges()

5
Migrating data

• Migrating everything from MyDB awe
  dbmigrateall.py AWAUSER KIDS
• Migrating a single object including its
  dependenciesfor sl in SourceList.name.like('TES
  T') context.migrate(sl, 'VESUVIO')

6
Deleting data

• Deleting everything in MyDB awe dbdeleteall.py
  AWAUSER
• Deleting a single object
• Requires careful checking for ALL dependent
  objects
• Is not yet possible
• DBAs run dbvacuum to delete files from
  dataservers that belong to deleted objects

7
Project specific source code

• Put project source code in separate CVS
  repositories
• awe will use code that is specific to the
  currently selected project
• Only code that is different needs to be kept in
  project specific CVS
• Beware of unnecessary divergence!