Load raster data to georaster table error

Question

I use the follow script to load raster data, but get some error,:
---create georaster table
CREATE TABLE city_images (image_id NUMBER, image_description VARCHAR2(50), image MDSYS.SDO_GEORASTER);
--create tablespace
create tablespace rdt_tbs_1 datafile 'D:\product\11.1.0\db\oradata\rdt\rdt_data_01.dbf' size 256m uniform size 4M;
--create RDT table
CREATE TABLE city_images_rdt OF MDSYS.SDO_RASTER
(PRIMARY KEY (rasterID, pyramidLevel, bandBlockNumber,
rowBlockNumber, columnBlockNumber))
TABLESPACE rdt_tbs_1 NOLOGGING
LOB(rasterBlock) STORE AS lobseg
CHUNK 32768
CACHE READS
NOLOGGING
PCTVERSION 0
STORAGE (PCTINCREASE 0)
--赋予访问文件的权限
call dbms_java.grant_permission('MDSYS','SYS:java.io.FilePermission', 'D:\work\raster\image2\Extract_20.img', 'read' );
call dbms_java.grant_permission('PUBLIC','SYS:java.io.FilePermission', 'D:\work\raster\image2\Extract_20.img', 'read' );
--insert data
INSERT INTO city_images VALUES(1,'IMG',SDO_GEOR.INIT('city_images_rdt'));
--load data
DECLARE
geor MDSYS.SDO_GEORASTER;
BEGIN
INSERT INTO city_images values( 1, 'IMG', MDSYS.sdo_geor.init('city_images_rdt') );
SELECT image INTO geor FROM city_images WHERE image_id = 1 FOR UPDATE;
MDSYS.sdo_geor.importFrom(geor,NULL, 'IMG', 'file', 'D:\work\raster\image2\Extract_20.img');
UPDATE city_images SET image = geor WHERE image_id = 1;
END;
I use the system user, when I load data. It give me some error like this:ORA-13464: load GeoRaster data error: - Unable to render RenderedOp for this operation. ORA-06512: 在 "MDSYS.MD", line 1723 ORA-06512: 在 "MDSYS.MDERR", line 17 ORA-06512: 在 "MDSYS.SDO_GEOR", line 5006 ORA-06512: 在 line 5

Answer 1

Extract_20.img file has an extension IMG and thus must be in the ERDAS Imagine file format. The GeoRaster loader doesn't support this format and that's why you saw the error mesg. To load img files, you have to use third-party ETL tool for GeoRaster, or otherwise follow the instructions in section 3.3.1 in the georaster 11g developer's guide.
with your scripts, a few recommendations:
1. add "primary key" to you image_id definition (... image_id number PRIMARY KEY ...) when you define city_images table.
you have two identical INSERT stmts, which should have led to a different error mesg because you have a select stmt before the loading stmt.
2. when you create the tablespace for RDTs or add datafile to a tablespace, use "autoextend", for example,
create tablespace tbs_gr1 datafile 't_gr1_1.f'
size 300M reuse autoextend on next 20M;
3. always create user(s) for all such databases, instead of using SYSTEM user.
regards,
jeffrey xie