put in changes to only keep the last terrain revision. The current

unbounded model causes performance and filesystem filling grief.
Before enabling this again, we need a reasonable bounding model.

OpenSim/Region/Storage/OpenSim.DataStore.MonoSqlite/MonoSqliteDataStore.cs

@@ -280,6 +280,20 @@ namespace OpenSim.DataStore.MonoSqlite
                     cmd.Parameters.Add(new SqliteParameter(":Heightfield", serializeTerrain(ter)));
                     cmd.ExecuteNonQuery();
                 }
+
+                // This is added to get rid of the infinitely growing
+                // terrain databases which negatively impact on SQLite
+                // over time.  Before reenabling this feature there
+                // needs to be a limitter put on the number of
+                // revisions in the database, as this old
+                // implementation is a DOS attack waiting to happen.
+
+                using(SqliteCommand cmd = new SqliteCommand("delete from terrain where RegionUUID=:RegionUUID and Revision < :Revision", conn))
+                {
+                    cmd.Parameters.Add(new SqliteParameter(":RegionUUID", regionID.ToString()));
+                    cmd.Parameters.Add(new SqliteParameter(":Revision", revision));
+                    cmd.ExecuteNonQuery();
+                }
                 conn.Close();
             }
         }