Spatial index creation for table with more than one geometry columns?

I have table with more than one geometry columns.
I'v added in user_sdo_geom_metadata table record for every column in the table.
When I try to create spatial indexes over geometry columns in the table - i get error message:
ERROR at line 1:
ORA-29855: error occurred in the execution of ODCIINDEXCREATE routine
ORA-13203: failed to read USER_SDO_GEOM_METADATA table
ORA-13203: failed to read USER_SDO_GEOM_METADATA table
ORA-06512: at "MDSYS.SDO_INDEX_METHOD", line 8
ORA-06512: at line 1
What is the the solution?

I'v got errors in my user_sdo_geom_metadata.
The problem does not exists!

Similar Messages

Error while running spatial queries on a table with more than one geometry.

Hello,
I'm using GeoServer with Oracle Spatial database, and this is a second time I run into some problems because we use tables with more than one geometry.
When GeoServer renders objects with more than one geometry on the map, it creates a query where it asks for objects which one of the two geometries interacts with the query window. This type of query always fails with "End of TNS data channel" error.
We are running Oracle Standard 11.1.0.7.0.
Here is a small script to demonstrate the error. Could anyone confirm that they also have this type of error? Or suggest a fix?
What this script does:
1. Create table object1 with two geometry columns, geom1, geom2.
2. Create metadata (projected coordinate system).
3. Insert a row.
4. Create spacial indices on both columns.
5. Run a SDO_RELATE query on one column. Everything is fine.
6. Run a SDO_RELATE query on both columns. ERROR: "End of TNS data channel"
7. Clean.
CREATE TABLE object1
id NUMBER PRIMARY KEY,
geom1 SDO_GEOMETRY,
geom2 SDO_GEOMETRY
INSERT INTO user_sdo_geom_metadata (table_name, column_name, srid, diminfo)
VALUES
'OBJECT1',
'GEOM1',
2180,
SDO_DIM_ARRAY
SDO_DIM_ELEMENT('X', 400000, 700000, 0.05),
SDO_DIM_ELEMENT('Y', 300000, 600000, 0.05)
INSERT INTO user_sdo_geom_metadata (table_name, column_name, srid, diminfo)
VALUES
'OBJECT1',
'GEOM2',
2180,
SDO_DIM_ARRAY
SDO_DIM_ELEMENT('X', 400000, 700000, 0.05),
SDO_DIM_ELEMENT('Y', 300000, 600000, 0.05)
INSERT INTO object1 VALUES(1, SDO_GEOMETRY(2001, 2180, SDO_POINT_TYPE(500000, 400000, NULL), NULL, NULL), SDO_GEOMETRY(2001, 2180, SDO_POINT_TYPE(550000, 450000, NULL), NULL, NULL));
CREATE INDEX object1_geom1_sidx ON object1(geom1) INDEXTYPE IS MDSYS.SPATIAL_INDEX;
CREATE INDEX object1_geom2_sidx ON object1(geom2) INDEXTYPE IS MDSYS.SPATIAL_INDEX;
SELECT *
FROM object1
WHERE
SDO_RELATE("GEOM1", SDO_GEOMETRY(2001, 2180, SDO_POINT_TYPE(500000, 400000, NULL), NULL, NULL), 'MASK=ANYINTERACT') = 'TRUE';
SELECT *
FROM object1
WHERE
SDO_RELATE("GEOM1", SDO_GEOMETRY(2001, 2180, SDO_POINT_TYPE(500000, 400000, NULL), NULL, NULL), 'MASK=ANYINTERACT') = 'TRUE' OR
SDO_RELATE("GEOM2", SDO_GEOMETRY(2001, 2180, SDO_POINT_TYPE(500000, 400000, NULL), NULL, NULL), 'MASK=ANYINTERACT') = 'TRUE';
DELETE FROM user_sdo_geom_metadata WHERE table_name = 'OBJECT1';
DROP INDEX object1_geom1_sidx;
DROP INDEX object1_geom2_sidx;
DROP TABLE object1;
Thanks for help.

This error appears in GeoServer and SQLPLUS.
I have set up a completly new database installation to test this error and everything works fine. I tried it again on the previous database but I still get the same error. I also tried to restart the database, but with no luck, the error is still there. I geuss something is wrong with the database installation.
Anyone knows what could cause an error like this "End of TNS data channel"?

ADF Table with more than one TableSelectMany column

Does anyone know how to add more than one TableSelectMany component to a table? So, basically I'm trying to have two checkboxes for each row in the table
thanks,
Eric

Eric,
the TableSelectMany column is element of the selection facade which only takes one element.
To create additional checkboxes, you can - of course - add an additional table column to the table and add a checkbox to it
Frank

Error with SDO_TUNE.EXTENT_OF on a table with more than one geometry.

Hello,
I'm using a GeoServer with Oracle Spatial database, and I run into some problems. GeoServer uses SDO_TUNE.EXTENT_OF to calculate the maximum extent of features you add. It works fine for all object with only one geometry, but fails for objects that has two geometry columns. The error is ORA-01422.
Is this a bug in Oracle, or am I doing something wrong? I know SDO_AGGR_MBR works fine, but I'd rather not use it, since if it is possible I would like to avoid changing the GeoServer functions.
Here is a small script I created to show this error:
1. Create two tables, object1 with one geometry and object2 with two geometry columns.
2. Create metadata (projected coordinate system).
3. Insert two rows, one in each table.
4. Create spacial indices.
5. Calculate extent, on object1 it will succeed, on object2 it will fail.
6. Clean.
CREATE TABLE object1
     id NUMBER PRIMARY KEY,
     geom1 SDO_GEOMETRY
CREATE TABLE object2
     id NUMBER PRIMARY KEY,
     geom1 SDO_GEOMETRY,
     geom2 SDO_GEOMETRY
INSERT INTO user_sdo_geom_metadata (table_name, column_name, srid, diminfo)
VALUES
     'OBJECT1',
     'GEOM1',
     2180,
     SDO_DIM_ARRAY
          SDO_DIM_ELEMENT('X', 400000, 700000, 0.05),
          SDO_DIM_ELEMENT('Y', 300000, 600000, 0.05)
INSERT INTO user_sdo_geom_metadata (table_name, column_name, srid, diminfo)
VALUES
     'OBJECT2',
     'GEOM1',
     2180,
     SDO_DIM_ARRAY
          SDO_DIM_ELEMENT('X', 400000, 700000, 0.05),
          SDO_DIM_ELEMENT('Y', 300000, 600000, 0.05)
INSERT INTO user_sdo_geom_metadata (table_name, column_name, srid, diminfo)
VALUES
     'OBJECT2',
     'GEOM2',
     2180,
     SDO_DIM_ARRAY
          SDO_DIM_ELEMENT('X', 400000, 700000, 0.05),
          SDO_DIM_ELEMENT('Y', 300000, 600000, 0.05)
INSERT INTO object1 VALUES(1, SDO_GEOMETRY(2001, 2180, SDO_POINT_TYPE(450000, 350000, NULL), NULL, NULL));
INSERT INTO object2 VALUES(1, SDO_GEOMETRY(2001, 2180, SDO_POINT_TYPE(500000, 400000, NULL), NULL, NULL), SDO_GEOMETRY(2001, 2180, SDO_POINT_TYPE(550000, 450000, NULL), NULL, NULL));
CREATE INDEX object1_geom1_sidx ON object1(geom1) INDEXTYPE IS MDSYS.SPATIAL_INDEX;
CREATE INDEX object2_geom1_sidx ON object2(geom1) INDEXTYPE IS MDSYS.SPATIAL_INDEX;
CREATE INDEX object2_geom2_sidx ON object2(geom2) INDEXTYPE IS MDSYS.SPATIAL_INDEX;
SELECT SDO_TUNE.EXTENT_OF('OBJECT1', 'GEOM1') FROM DUAL;
SELECT SDO_TUNE.EXTENT_OF('OBJECT2', 'GEOM1') FROM DUAL;
SELECT SDO_TUNE.EXTENT_OF('OBJECT2', 'GEOM2') FROM DUAL;
DELETE FROM user_sdo_geom_metadata WHERE table_name IN ('OBJECT1', 'OBJECT2');
DROP INDEX object1_geom1_sidx;
DROP INDEX object2_geom1_sidx;
DROP INDEX object2_geom2_sidx;
DROP TABLE object1;
DROP TABLE object2;
Thanks for help.

Hi,
As a workaound to avoid the ORA-01422 errors, you could try to create views on your object2 table, and insert their geom metadata (with view names as table names!))
create view view2_1 as select * from object2;
create view view2_2 as select * from object2;
INSERT INTO user_sdo_geom_metadata (table_name, column_name, srid, diminfo)
VALUES
'VIEW2_1',
'GEOM1',
2180,
SDO_DIM_ARRAY
SDO_DIM_ELEMENT('X', 400000, 700000, 0.05),
SDO_DIM_ELEMENT('Y', 300000, 600000, 0.05)
INSERT INTO user_sdo_geom_metadata (table_name, column_name, srid, diminfo)
VALUES
'VIEW2_2',
'GEOM2',
2180,
SDO_DIM_ARRAY
SDO_DIM_ELEMENT('X', 400000, 700000, 0.05),
SDO_DIM_ELEMENT('Y', 300000, 600000, 0.05)
SELECT SDO_TUNE.EXTENT_OF('OBJECT1', 'GEOM1') FROM DUAL;
SELECT SDO_TUNE.EXTENT_OF('VIEW2_1', 'GEOM1') FROM DUAL;
SELECT SDO_TUNE.EXTENT_OF('VIEW2_2', 'GEOM2') FROM DUAL;
Results in 11.1.0.7.0
SDO_TUNE.EXTENT_OF('OBJECT1','GEOM1')(SDO_GTYPE, SDO_SRID, SDO_POINT(X, Y, Z), S
SDO_GEOMETRY(2003, 2180, NULL, SDO_ELEM_INFO_ARRAY(1, 1003, 3), SDO_ORDINATE_ARR
AY(450000, 350000, 450000, 350000))
SQL>
SDO_TUNE.EXTENT_OF('VIEW2_1','GEOM1')(SDO_GTYPE, SDO_SRID, SDO_POINT(X, Y, Z), S
SDO_GEOMETRY(2003, 2180, NULL, SDO_ELEM_INFO_ARRAY(1, 1003, 3), SDO_ORDINATE_ARR
AY(500000, 400000, 500000, 400000))
SQL>
SDO_TUNE.EXTENT_OF('VIEW2_2','GEOM2')(SDO_GTYPE, SDO_SRID, SDO_POINT(X, Y, Z), S
SDO_GEOMETRY(2003, 2180, NULL, SDO_ELEM_INFO_ARRAY(1, 1003, 3), SDO_ORDINATE_ARR
AY(550000, 450000, 550000, 450000))jack

Tables with more than one cell with a high number of rowspan (ej. 619). This cell can not be print in a page and it must be cut. But I don't know how indesign can do this action.

Tables with more than one cell with a high number of rowspan (ej. 619). This cell can not be print in a page and it must be cut. But I don’t know how indesign can do this action.

set the wake-on lan on the main computer
The laptop's too far away from the router to be connected by ethernet. It's all wifi.
No separate server app on the laptop, it's all samba
The files are on a windows laptop and a hard drive hooked up to the windows laptop. The windows share server is pants, so I'd need some sort of third party server running. Maybe you weren't suggesting to use Samba to connect to the windows share though?
I'm glad that you've all understood my ramblings and taken and interest, thanks The way I see it, I can't be the only netbook user these days looking for this kind of convenience, and I certainly won't be once chrome and moblin hit the market.
Last edited by saft (2010-03-18 20:38:08)

How to read an internal table with more than one (2 or 3) key field(s).

how to read an internal table with more than one (2 or 3) key field(s). in ecc 6.0 version

hi ,
check this..
report.
tables: marc,mard.
data: begin of itab occurs 0,
      matnr like marc-matnr,
      werks like marc-werks,
      pstat like marc-pstat,
      end of itab.
data: begin of itab1 occurs 0,
      matnr like mard-matnr,
      werks like mard-werks,
      lgort like mard-lgort,
      end of itab1.
parameters:p_matnr like marc-matnr.
select matnr
       werks
       pstat
       from marc
       into table itab
       where matnr = p_matnr.
sort itab by matnr werks.
select matnr
       werks
       lgort
       from mard
       into table itab1
       for all entries in itab
       where matnr = itab-matnr
       and werks = itab-werks.
sort itab1 by matnr werks.
loop at itab.
read table itab1 with key matnr = itab-matnr
                          werks = itab-werks.
endloop.
regards,
venkat.

How can I search for files with more than one keyword?

I´ve created some keywords, and some files in my folder are tagged with two, three or more keywords.
Is there a way to search for files using more than one keyword on the search field?
Thanks!

Use the Find command (menu Edit) and in criteria at the right side is a plus sign to add another criteria and set it to your custom wishes.
make a choice in results and you should be OK

How to create Dynamic Table with more than one column?

Hi,
I'm trying to learn Dreamweaver. I'm trying to display 2 units from my database in the same row then I would like go to next row.
By default DW shows single record in each row. Is it possible to display more than one?
Thank you

Of course. You will not name the divs differently, they will all be <div class="RowContainer"> (in the example below) and the reason they will look like
1 2
3 4
5 6
is because they will "stack themselves up". That is, the first will float to the top left, the next will float up next to it. The third will not fit on the top line floating next to two, so it will start a new row. Four will float up next to it, and five will start the new row.
Think of the string of divs (don't put wordspaces between them...) as a continuous ribbon or chain of divs. That is a slightly poor analogy, since the second and third won't be next to each other, as a chain or a ribbon might be. But you should be able to have as many divs as you have records... you define the div in the CSS and in your page markup really only show one div.
Here's a modified example from one of my files:
<div spry:region="ds1" class="...">
<div spry:repeat="ds1" class="RowContainer"> 
    {category} {title} {medium}<br>
     {price} {sold} {date}<br>
     {sold_to_purchase_price}
</div>
</div>
Beth

Checkbox with more than one display column.

Hi.
I have a checkbox item which I reference in a process (stored procedure) in my page. I'd like to display more than one field for the item, in different columns.
The lov query allows only 2 fields, the display value and the return value.
For now I just concatenate the 2 display fields, but I would like to display them in 2 different columns.
Is this possible?
My other option would be to use a report and set the item type to a simple checkbox. Is it possible then to reference the values of the report checkbox in my process ?
Thanks in advance.

Any ideas anyone?

EEWB: Insert New Table with more than one key field for BP object

Hi Gurus,
I want to enhance Business Partner object with a new table with two key fields, one the address number and another a sequence number, because I need to save several entries for each address belonging to a determined business partner. Something as what happens in communication data (i.e fax number)for an address.
I have run the wizard from EEWB but the only possibility that offers you is to create only one key field for the new custom table. There is something in EEWB to achieve this, two key fields for the new table?
Another question is the following: which Badi or BAPI must I enhance to populate my table with the corresponding address number to which the data belong to?
I mean my custom data are filled through a table control that I have allocated within the screen sequence BUA130 (Detail Address). Thus, when a new address is added to a BP and my particular table control is populated within this address I should fill the key fields from my table (address number and sequence number) when the BP were saved. So, I must know beforehand which address number the system will assign to this new address.
I repeat the question: which Badi or BAPI must I enhance to populate my table with the corresponding address number to which the data belong to?
Thanks in Advance.
Regards,
Rosa Ferrando

Hi Rosa,
Please go through the following links. It will help you.
<a href="http://help.sap.com/saphelp_crm50/helpdata/en/20/a4ffee7e0fcc4ebb7e5466d3903d38/frameset.htm">http://help.sap.com/saphelp_crm50/helpdata/en/20/a4ffee7e0fcc4ebb7e5466d3903d38/frameset.htm</a>
<b>Reward points if it helps.</b>
Regards,
Amit Mishra

Rendering a table with more than one record per "row"

Ok, it's like this. I have a collection that I want to render as an ADF Table with a single column. Except I want to render multiple entries in the collection per row of the table
i.e. a normal ADF table would be like:
[Column Header]
[Row1.TextField]
[Row2.TextField]
[Row3.TextField]
[Row4.TextField]
[Row5.TextField]
I would like to render it something like:
[Column Header]
[Row1.TextField] [Row2.TextField] [Row3.TextField]
[Row4.TextField] [Row5.TextField]
That is, I want to add each record's text field horizontally first before adding a new row vertically.
Any way to do this with the ADF Table? Or is there another component I should use?

Hi,
you can try the "af:iterator" component
example
<af:panelGroupLayout id="pgl4" layout="horizontal">
                <af:iterator id="i1" value="#{bindings.MyTree.collectionModel}"
                             var="row" varStatus="vs">
                  <af:panelGroupLayout id="pgl5"
                                       rendered="#{(vs.index mod 3) eq 1}"
                                       inlineStyle="width:100px;"
                                       layout="horizontal">
                    <af:outputText value="#{row.CityCode}" id="ot2"/>
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                  <af:panelGroupLayout id="pgl6"
                                       rendered="#{(vs.index mod 3) eq 2}"
                                       inlineStyle="width:100px;"
                                       layout="horizontal">
                    <af:outputText value="#{row.CityCode}" id="outputText3"/>
                  </af:panelGroupLayout>
                  <af:panelGroupLayout id="pgl7"
                                       rendered="#{(vs.index mod 3) eq 0}"
                                       inlineStyle="width:100px;"
                                       layout="horizontal">
                    <af:outputText value="#{row.CityCode}" id="outputText4"/>
                  </af:panelGroupLayout>
                  <af:outputText value=" <tr>" id="ot3" escape="false"
                                 rendered="#{(vs.index mod 3) eq 2}"/>
                </af:iterator>
</af:panelGroupLayout>Regards
Nicolas

More than one SDO_GEOMETRY columns in one Oracle 8i spatial table

I have a spatial table as follows:
CREATE TABLE TEST(
ID VARCHAR2(255) NOT NULL,
POINT MDSYS.SDO_GEOMETRY,
LINE MDSYS.SDO_GEOMETRY,
POLYGON MDSYS.SDO_GEOMETRY,
PRIMARY KEY(ID));
Is it a good practice to have more than one SDO_GEOMETRY columns
in one spatial table? What are the drawbacks if any to have a
spatial with more than one layer?

I have one question about more than one SDO_GEOMETRY columns
in one table in Oracle 8.1.7. When I wanted to create two
spatial indices for this table, every time I got some error.
Can anyone tell me how to figure it out?
Thanks very much,
Fan Fan,
You need to insert metadata record before creating spatial
indices.
Try the following:
REM USER_SDO_GEOM_METADATA :
REM insert a row for the geom layer for TEST TEST2 tables
REM
INSERT INTO USER_SDO_GEOM_METADATA
( TABLE_NAME, COLUMN_NAME, DIMINFO, SRID)
VALUES ('TEST', 'POINT', MDSYS.SDO_DIM_ARRAY
(MDSYS.SDO_DIM_ELEMENT('LON', -180,
180, .000005),MDSYS.SDO_DIM_ELEMENT('LAT', -90, 90, .000005)),
NULL);
INSERT INTO USER_SDO_GEOM_METADATA
( TABLE_NAME, COLUMN_NAME, DIMINFO, SRID)
VALUES ('TEST', 'LINE', MDSYS.SDO_DIM_ARRAY
(MDSYS.SDO_DIM_ELEMENT('LON', -180,
180, .000005),MDSYS.SDO_DIM_ELEMENT('LAT', -90, 90, .000005)),
NULL);
INSERT INTO USER_SDO_GEOM_METADATA
( TABLE_NAME, COLUMN_NAME, DIMINFO, SRID)
VALUES ('TEST', 'POLYGON', MDSYS.SDO_DIM_ARRAY
(MDSYS.SDO_DIM_ELEMENT('LON', -180,
180, .000005),MDSYS.SDO_DIM_ELEMENT('LAT', -90, 90, .000005)),
NULL);
REM create a spatial index based on TRAFFIC.GEOM
REM
REM
CREATE INDEX TEST_G_POINT_IDX ON TEST(POINT) INDEXTYPE IS
MDSYS.SPATIAL_INDEX;
CREATE INDEX TEST_G_LINE_IDX ON TEST(LINE) INDEXTYPE IS
MDSYS.SPATIAL_INDEX;
CREATE INDEX TEST_G_POLYGON_IDX ON TEST(POLYGON) INDEXTYPE IS
MDSYS.SPATIAL_INDEX;

Table with more than 35 columns

Hello All.
How can one work with a table with more than 35 columns
on JDev 9.0.3.3?
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Setting Entities's Beans properties from a Session Bean
bought up the error, but when setting from inside the EJB,
the bug stays clear.
Is this right?
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Thank you all for reply.
Here's my problem:
I have an AS400/DB2 Database, a huge and an old one.
There is many COBOL Programs used to communicate with this DB.
My project is to transfer the database with the same structure and the same contents to a Linux/ORACLE System.
I will not remake the COBOL Programs. I will use the existing one on the Linux System.
So the tables of the new DB should be the same as the old one.
That’s why I can not make a relational DB. I have to make an exact migration.
Unfortunately I have some tables with more than 5000 COLUMNS.
Now my question is:
can I modify the parameters of the ORACE DB to make it accept Tables and Views with more than 1000 columns, If not, is it possible to make a PL/SQL Function that simulate a table, this function will insert/update/select data from many other small tables (<1000 columns). I want to say a method that make the ORACLE DB acting like if it has a table with a huge number of columns;
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I want to enable a PK in a tables with more than 1680 subpartitions

Hi All
i want to enable a PK in a tables with more than 1680 subpartitions
SQL> ALTER SESSION ENABLE PARALLEL DDL ;
Session altered.
SQL> alter table FDW.GL_JE_LINES_BASE_1 enable constraint GL_JE_LINES_BASE_1_PK parallel 8;
alter table FDW.GL_JE_LINES_BASE_1 enable constraint GL_JE_LINES_BASE_1_PK parallel 8
ERROR at line 1:
ORA-00933: SQL command not properly ended
SQL> alter table FDW.GL_JE_LINES_BASE_1 enable constraint GL_JE_LINES_BASE_1_PK parallel 8 nologging;
alter table FDW.GL_JE_LINES_BASE_1 enable constraint GL_JE_LINES_BASE_1_PK parallel 8 nologging
ERROR at line 1:
ORA-00933: SQL command not properly ended
SQL> alter table FDW.GL_JE_LINES_BASE_1 parallel 8;
Table altered.
SQL> alter table FDW.GL_JE_LINES_BASE_1 enable constraint GL_JE_LINES_BASE_1_PK;
alter table FDW.GL_JE_LINES_BASE_1 enable constraint GL_JE_LINES_BASE_1_PK
ERROR at line 1:
ORA-01652: unable to extend temp segment by 128 in tablespace TS_FDW_DATA
Please advice or tell how it would be the best way to do this
Regards
Jesus

When you try to create a PK you automaticaly created an index. If you want to put this index in different tablespace you should use 'using index..' option when you create this primary key.

Row chaining in table with more than 255 columns

Hi,
I have a table with 1000 columns.
I saw the following citation: "Any table with more then 255 columns will have chained
rows (we break really wide tables up)."
If I insert a row populated with only the first 3 columns (the others are null), is a row chaining occurred?
I tried to insert a row described above and no row chaining occurred.
As I understand, a row chaining occurs in a table with 1000 columns only when the populated data increases
the block size OR when more than 255 columns are populated. Am I right?
Thanks
dyahav

user10952094 wrote:
Hi,
I have a table with 1000 columns.
I saw the following citation: "Any table with more then 255 columns will have chained
rows (we break really wide tables up)."
If I insert a row populated with only the first 3 columns (the others are null), is a row chaining occurred?
I tried to insert a row described above and no row chaining occurred.
As I understand, a row chaining occurs in a table with 1000 columns only when the populated data increases
the block size OR when more than 255 columns are populated. Am I right?
Thanks
dyahavYesterday, I stated this on the forum "Tables with more than 255 columns will always have chained rows." My statement needs clarification. It was based on the following:
http://download.oracle.com/docs/cd/B28359_01/server.111/b28318/schema.htm#i4383
"Oracle Database can only store 255 columns in a row piece. Thus, if you insert a row into a table that has 1000 columns, then the database creates 4 row pieces, typically chained over multiple blocks."
And this paraphrase from "Practical Oracle 8i":
V$SYSSTAT will show increasing values for CONTINUED ROW FETCH as table rows are read for tables containing more than 255 columns.
Related information may also be found here:
http://download.oracle.com/docs/cd/B10501_01/server.920/a96524/c11schem.htm
"When a table has more than 255 columns, rows that have data after the 255th column are likely to be chained within the same block. This is called intra-block chaining. A chained row's pieces are chained together using the rowids of the pieces. With intra-block chaining, users receive all the data in the same block. If the row fits in the block, users do not see an effect in I/O performance, because no extra I/O operation is required to retrieve the rest of the row."
http://download.oracle.com/docs/html/B14340_01/data.htm
"For a table with several columns, the key question to consider is the (average) row length, not the number of columns. Having more than 255 columns in a table built with a smaller block size typically results in intrablock chaining.
Oracle stores multiple row pieces in the same block, but the overhead to maintain the column information is minimal as long as all row pieces fit in a single data block. If the rows don't fit in a single data block, you may consider using a larger database block size (or use multiple block sizes in the same database). "
Why not a test case?
Create a test table named T4 with 1000 columns.
With the table created, insert 1,000 rows into the table, populating the first 257 columns each with a random 3 byte string which should result in an average row length of about 771 bytes.
SPOOL C:\TESTME.TXT
SELECT
SN.NAME,
MS.VALUE
FROM
V$MYSTAT MS,
V$STATNAME SN
WHERE
SN.NAME = 'table fetch continued row'
AND SN.STATISTIC#=MS.STATISTIC#;
INSERT INTO T4 (
COL1,
COL2,
COL3,
COL255,
COL256,
COL257)
SELECT
DBMS_RANDOM.STRING('A',3),
DBMS_RANDOM.STRING('A',3),
DBMS_RANDOM.STRING('A',3),
DBMS_RANDOM.STRING('A',3)
FROM
DUAL
CONNECT BY
LEVEL<=1000;
SELECT
SN.NAME,
MS.VALUE
FROM
V$MYSTAT MS,
V$STATNAME SN
WHERE
SN.NAME = 'table fetch continued row'
AND SN.STATISTIC#=MS.STATISTIC#;
SET AUTOTRACE TRACEONLY STATISTICS
SELECT
FROM
T4;
SET AUTOTRACE OFF
SELECT
SN.NAME,
SN.STATISTIC#,
MS.VALUE
FROM
V$MYSTAT MS,
V$STATNAME SN
WHERE
SN.NAME = 'table fetch continued row'
AND SN.STATISTIC#=MS.STATISTIC#;
SPOOL OFFWhat are the results of the above?
Before the insert:
NAME                      VALUE
table fetch continue        166
After the insert:
NAME                      VALUE
table fetch continue        166
After the select:
NAME                 STATISTIC#      VALUE
table fetch continue        252        332 Another test, this time with an average row length of about 12 bytes:
DELETE FROM T4;
COMMIT;
SPOOL C:\TESTME2.TXT
SELECT
SN.NAME,
MS.VALUE
FROM
V$MYSTAT MS,
V$STATNAME SN
WHERE
SN.NAME = 'table fetch continued row'
AND SN.STATISTIC#=MS.STATISTIC#;
INSERT INTO T4 (
COL1,
COL256,
COL257,
COL999)
SELECT
DBMS_RANDOM.STRING('A',3),
DBMS_RANDOM.STRING('A',3),
DBMS_RANDOM.STRING('A',3),
DBMS_RANDOM.STRING('A',3)
FROM
DUAL
CONNECT BY
LEVEL<=100000;
SELECT
SN.NAME,
MS.VALUE
FROM
V$MYSTAT MS,
V$STATNAME SN
WHERE
SN.NAME = 'table fetch continued row'
AND SN.STATISTIC#=MS.STATISTIC#;
SET AUTOTRACE TRACEONLY STATISTICS
SELECT
FROM
T4;
SET AUTOTRACE OFF
SELECT
SN.NAME,
SN.STATISTIC#,
MS.VALUE
FROM
V$MYSTAT MS,
V$STATNAME SN
WHERE
SN.NAME = 'table fetch continued row'
AND SN.STATISTIC#=MS.STATISTIC#;
SPOOL OFFWith 100,000 rows each containing about 12 bytes, what should the 'table fetch continued row' statistic show?
Before the insert:
NAME                      VALUE
table fetch continue        332
After the insert:
NAME                      VALUE
table fetch continue        332
After the select:
NAME                 STATISTIC#      VALUE
table fetch continue        252      33695The final test only inserts data into the first 4 columns:
DELETE FROM T4;
COMMIT;
SPOOL C:\TESTME3.TXT
SELECT
SN.NAME,
MS.VALUE
FROM
V$MYSTAT MS,
V$STATNAME SN
WHERE
SN.NAME = 'table fetch continued row'
AND SN.STATISTIC#=MS.STATISTIC#;
INSERT INTO T4 (
COL1,
COL2,
COL3,
COL4)
SELECT
DBMS_RANDOM.STRING('A',3),
DBMS_RANDOM.STRING('A',3),
DBMS_RANDOM.STRING('A',3),
DBMS_RANDOM.STRING('A',3)
FROM
DUAL
CONNECT BY
LEVEL<=100000;
SELECT
SN.NAME,
MS.VALUE
FROM
V$MYSTAT MS,
V$STATNAME SN
WHERE
SN.NAME = 'table fetch continued row'
AND SN.STATISTIC#=MS.STATISTIC#;
SET AUTOTRACE TRACEONLY STATISTICS
SELECT
FROM
T4;
SET AUTOTRACE OFF
SELECT
SN.NAME,
SN.STATISTIC#,
MS.VALUE
FROM
V$MYSTAT MS,
V$STATNAME SN
WHERE
SN.NAME = 'table fetch continued row'
AND SN.STATISTIC#=MS.STATISTIC#;
SPOOL OFFWhat should the 'table fetch continued row' show?
Before the insert:
NAME                      VALUE
table fetch continue      33695
After the insert:
NAME                      VALUE
table fetch continue      33695
After the select:
NAME                 STATISTIC#      VALUE
table fetch continue        252      33695 My statement "Tables with more than 255 columns will always have chained rows." needs to be clarified:
"Tables with more than 255 columns will always have chained rows +(row pieces)+ if a column beyond column 255 is used, but the 'table fetch continued row' statistic +may+ only increase in value if the remaining row pieces are found in a different block."
Charles Hooper
IT Manager/Oracle DBA
K&M Machine-Fabricating, Inc.
Edited by: Charles Hooper on Aug 5, 2009 9:52 AM
Paraphrase misspelled the view name "V$SYSSTAT", corrected a couple minor typos, and changed "will" to "may" in the closing paragraph as this appears to be the behavior based on the test case.

Spatial index creation for table with more than one geometry columns?

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