Database:Documentation

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This is a running start at documenting the tables in the MySQL instances used on both grid and regions, and describing how they relate to each other in the context of an OpenSim grid.

SQLite is generally not considered apropriate for this use case and will not be covered here; however the table structures are very similar and most of what is here will be useful in that context as well.

Note that some of these tables may be relics, some may be planned for future use, and some may see heavy use but have columns which are relics, not yet properly updated or not yet used at all. Alpha code FTW!! :D



The instances:

Grid:
 
agents
Records agent (Avatar/User) login details
assets
Comprehensive grid assets including textures and avatar inventories
avatarappearance
Persistence of the visual appearance of avatars between logins
inventoryfolders
Inventory folder-related details *excepting contents*
 Contents are in the inventoryitems table and point back to inventoryfolders
inventoryitems
All inventory item details (including folder associations) except contents - contents are referenced
 in the assets table

logs
Stores a record of logged events
logs_preTimestamp
Old format logs table?
**RELIC - no longer present in dist DB
 *** it would appear neither of these log tables is currently used ***

migrationsSupports 'automagic' migration to new database formats
regionsRegions known to the grid
reservationsRegion registration table. This table has no rows on OSGrid and is likely in place for future functionality
**RELIC - no longer present in dist DB
userfriendsFriends list registration
usersStored user profile



Region:
 
estate_groups
Narrowly purposed at present. Appears to associate UUIDs under an Estate ID
estate_managers
Assoicates UUIDs with Estate ID
estate_map
Associates Regions with Estates By Estate ID
estate_settings
Settings for Estates
estate_users
Users allowed on the Estate
estateban
Users banned from the Estate
land
Parcel Properties
landaccesslist
Parcel Access List
migrations
Supports 'automagic' upgrade to new database formats
primitems
contains the prim's inventory, which is not at all unlike the avatars'
inventory with the exception of folders
prims
All rezzed prim details *excepting shape and contents*
primshapes
Properties of all rezzed prims
regionban
Per-Region ban list
regionsettings
Per-Region settings
terrain
Terrain mesh revision history

Full details of back-store instantiation as performed by the OpenSim software can be found here:
http://opensimulator.org/svn/opensim/trunk/OpenSim/Data/MySQL/Resources/

Here is a note concerning the initial creation of the MySQL tables

Questions about this documentation can be directed to daTwitch on #opensim-dev or #osgrid FreeNode IRC or Hiro Protagonist on OSGrid.
For further clarification of the content ask on #opensim-dev look for sdague, JustinCC or DrSco

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