Is it possible to create a spatial index on a view?

Question

Hi
Is it possible to create a spatial index on a view?
We would like to link our spatial tables to each other (using only one of the SDO_GEOMETRY fields) in a view & make it very easy so that anybody can work with the data.
Thanks Caroline.

Answer 1

Simon,
In order for autoregistration to work, you first need to make sure that all entries in mdsys.sdo_geom_metadata_table are registered with SDE. All tables not just one schema. None of our spatial tables or views exist in the SDE schema.
Also make sure all Oracle Spatial tables in sde.table_registry are held in mdsys.sdo_geom_metadata_table.
When a user makes a database connection in ArcCatalog, all Oracle Spatial tables will be registered with SDE automatically. Also, entries will be inserted into mdsys.sdo_geom_metadata_table and indexes will be created. If you do not have primary key fields, you will have to Register with Geodatabase and it will create the OBJECTID field.
This did not work for us originally. but after cleaning up metadata and installing SP1, it is working now and it is very convenient.
VIEWS:
You have to create the view thru SDE. You cannot register foreign views. There are bugs in support of views containing SDO_GEOMETRY objects. I have been told some problems will be fixed in SP2 and there may be a patch out to address some others.
Here are the incidents I have filed in reference to views:
1.
I created a view consisting of a geometry column from a "foreign" Oracle
Spatial table (SDO_GEOMETRY) and corresponding attribution in another table.
I used the following command to create the view through SDE:
C:\arcgis\arcexe81\BIN>sdetable -o create_view -T gis_v_traffic -t
"trims_traffi c_geom,traffic" -c
"trims_traffic_geom.geometry,trims_traffic_geom.fid,traffic.i
d_number,traffic.aadt" -w "trims_traffic_geom.mslink = traffic.mslink" -u
gis -p spatial -i esri_sde -s JJ0DN10
ArcSDE 8.1 Build 832 Thu Mar 22 14:08:07 PST 2001 Attribute Administration
Utility ----------------------------------------------------- Successfully
created view gis_v_traffic.
I can preview the geometries in ArcCatalog without error.
However, when I try to select a feature in ArcMap I get the following error:
The instruction at "0x125222dd" referenced memory at "0x00000000". The
memory could not be "read".
I click ok.
Then I get this error:
The insruction at "0x5f8012d3" referenced memory at "0x00000004". the memory
could not be "read".
I click ok and ArcMap terminates.
I can select features from the spatial table the view is pointing to, but
not from the view itself.
2.
I need to create views utilizing database links to tie attribution in other
databases to geometries created for that data in a spatial database.
I issued the following command from command prompt and got this error:
C:\arcgis\arcexe81\BIN>sdetable -o create_view -T link_v_traffic -t
"trims_traff ic_geom,[email protected]" -c
"trims_traffic_geom.geometry,trims_traffic_ge
om.fid,[email protected],[email protected]" -w
"trims_t raffic_geom.mslink = [email protected]" -u gis -p
spatial -i esri_sd e -s JJ0DN10
ArcSDE 8.1 Build 832 Thu Mar 22 14:08:07 PST 2001 Attribute Administration
Utility ----------------------------------------------------- Error:
Underlying DBMS error (-51). Error: Unable to create view link_v_traffic
ORA-00957: duplicate column name (link_v_traffic)
3.
Spatial Views created on Oracle Spatial LRS layers containing SDO_GEOMETRY
objects are not recognized as feature classes unless they are created with
the sdetable -o create_view command.
Here is typical SQL for the view creation:
create or replace view trims_v_traffic as select a.geometry,
b.nbr_tenn_cnty, b.nbr_rte, b.spcl_cse, b.cnty_seq, b.tr_beg_log_mle,
b.tr_end_log_mle, b.yr_trfc, b.aadt, b.pct_peak_hr, b.dhv_pct, b.drct_distr,
b.vhcl_pass_pickups, b.vhcl_su_trk, b.vhcl_mu_trk, b.actl_cnt, b.updt_by,
b.updt_on, b.mslink, b.mapid, b.id_number, b.sta_nbr from
gis.trims_traffic_geom a, gis.traffic b where a.mslink = b.mslink;
The table containing the SDO_GEOMETRY object is registered with SDE in the
following manner:
C:\arcgis\arcexe81\BIN>sdelayer -o register -l trims_traffic_geom,geometry
-e slM -k SDO_GEOME
TRY -s JJ0DN10 -i esri_sde -u gis -p spatial -c fid -C SDE
A feature class is successfully created for this layer and the data can be
added successfully to a map.
However, there is no way of adding data to a map from a spatial database
view containing an SDO_GEOMETRY object which was created externally from
SDE.
We are using Oracle Spatial 8.1.7 on NT 4.0. We are also using ArcGIS 8.1
and ArcSDE 8.1.1.
4.
SDE does not support spatial database views which reference snapshot
objects.
I was unable to create a view using sdetable -o create_view which referenced
a snapshot object.
The snapshot was created using the following sql syntax:
CREATE SNAPSHOT SNP_TEST
BUILD IMMEDIATE
REFRESH FAST
ON DEMAND
AS
SELECT * FROM [email protected]
We are using ArcSDE 8.1.1 with Oracle 8.1.7 on NT 4.0.
Here are the permissions I granted, they need to be the same for every schema:
for sde (these are all the permissions that might be needed for any type of
activity - new install or upgrade)..lets just step through and go ahead and
grant them all...
grant create session to sde;
grant create table to sde;
grant create procedure to sde;
grant create sequence to sde;
grant create trigger to sde;
grant unlimited tablespace to sde;
grant select any table to sde;
grant create any sequence to sde;
grant create any procedure to sde;
grant execute any procedure to sde;
grant drop any procedure to sde;
grant select any sequence to sde;
grant create any view to sde;
grant drop any view to sde;
grant create any trigger to sde;
grant drop any sequence to sde;
each Oracle user will also need the following privileges...
grant create session to gis;
grant create table to gis;
grant create procedure to gis;
grant create sequence to gis;
grant create trigger to gis;
grant unlimited tablespace to gis;
Viewer
The viewer is allowed to connect to an ArcSDE database. Other users grant
select privileges on their tables and feature classes to the viewer or to
the public role. The DBA can create a role that can be granted select
privileges on data objects owned by other users. The role can be granted to
the viewer.
create session
select on other user's data objects
Editor
The editor is allowed to connect to an ArcSDE database. Other users grant
select and insert, update, or delete on data objects they own to editor. The
DBA may create a role that can be granted select, insert, update, and delete
privileges on data objects owned by other users. The role can be granted to
the editor.
create session
select, insert, update, or delete on other user's data objects
Creator
The creator is allowed to connect to an ArcSDE database and create data
objects. The creator may grant privileges on their
objects to other users or roles. Other users can grant select and insert,
update, or delete on data objects they own to creator. The DBA may create a
role that can be granted select, insert, update, and delete privileges on
data objects
owned by other users. The role can be granted to the creator:
create session
create table
create procedure
create sequence
create trigger
unlimited tablespace
select, insert, update, or delete on other user's objects
It might be worthwhile to rebuild your SDE metadata. I can walk you thru that if you need help.
Hope this helps.
Dave
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