SDO_RDF_MATCH() query pattern size

Hi,
I found that 'SDO_RDF_MATCH()' procedure is using a VARCHAR for 'query-pattern' parameter, which is limiting the size of SPARQL query-pattern to just 4000 bytes in 10gR2 database.
Is there any way that I can send query-patterns, with much bigger size?
Thanks,
Bhaskar.

Please see my comments in the following post.
Failing to execute large queries --> 11.1.0.7.0
Cheers,
Zhe Wu

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SDO_RDF_MATCH() Query Performace on 10g - ontology model size-5000 triples

Hi,
We are observing severe degradation in the performance of the queries as their size increases? In this context, I want to know if the performance of the query is dependent on the query pattern size? For example, a query with 25 triples in the query pattern is taking nearly 10 secs, to retrieve results from a ontology of size 5000 triples. (no rule bases attached, no inferencing).
Does using query API in Jena Adapter (instead of using sdo_rdf_match() directly) help improve the performance? Also, can u suggest any tuning on the ontology model for speeding up the query execution?
Thanks,
Rajesh.
Edited by: rajesh narni on Oct 8, 2009 4:29 AM

Please see my comments in the following post.
Failing to execute large queries --> 11.1.0.7.0
Cheers,
Zhe Wu

Query pattern for SDO_RDF_MATCH

What form of query can be found in the first SDO_RDF_MATCH function parameter?
In SPARQL it is possible to use in OPTIONAL keyword, for example
SELECT ?x ?y ?z
?x test:value ?y OPTIONAL { ?y test:hasIncome ?z }
I will be given in the result the records which has both triples, but also those for which te second triple is not set. Is it possible to get the same effect in Oracle?
Thanks for answer.

We do not yet support the use of OPTIONAL in the query pattern, but the query can be expressed by calling SDO_RDF_MATCH twice and using an outer join.
For example, consider the example in the documentation (the 'family' model). The following query will select subjects of type 'Male', including those who do not have an address set.
Melli
SELECT t1.x Male, t2.y Address
FROM TABLE(SDO_RDF_MATCH(
'(?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> :Male)',
SDO_RDF_Models('family'),
NULL,
SDO_RDF_Aliases(SDO_RDF_Alias('','http://www.example.org/family/')),
null)) t1,
TABLE(SDO_RDF_MATCH(
'(?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> :Male)
(?x :address ?y)',
SDO_RDF_Models('family'),
NULL,
SDO_RDF_Aliases(SDO_RDF_Alias('','http://www.example.org/family/')),
null)) t2
where t1.x=t2.x (+)
;

Problem with SDO_RDF_MATCH query

hi guys
I was trying to use test the "FAMILY INFORMATION" example that came with Oracle Spatial (RDF Descripton Framework). I was able to load all the statements present in the manual. But the I got the below error while executing the a query.Below are given the query and the error
Query:
SQL> SELECT m MALES
2 FROM TABLE(SDO_RDF_MATCH(
3 '(?m rdf:type :Male)',
4 SDO_RDF_Models('family'), null,
5 SDO_RDF_Aliases(SDO_RDF_Alias('','http://www.example.org/family/')), null));
Error :
ERROR at line 1:
ORA-20000: RDF_MATCH Query pattern must be a non-null compile-time constant.
ORA-06512: at "MDSYS.RDF_MATCH_IMPL_T", line 29
ORA-06512: at line 4
Can anyone got into the same situation and found the solution.
Thanks chandra

hi
DBA has fixed the problem. But when i executed the query another thing came up.
Here are steps:
Query execution:
SELECT m MALES
FROM TABLE(SDO_RDF_MATCH(
'(?m rdf:type :Male)',
SDO_RDF_Models('family'), null,
SDO_RDF_Aliases(SDO_RDF_Alias('','http://www.example.org/family/')), null));
results :
MALES
http://www.example.org/family/Tom
But the result has to be :
MALES
http://www.example.org/family/Jack
http://www.example.org/family/Tom
Then i added the other statement:
INSERT INTO family_rdf_data VALUES (14,
SDO_RDF_TRIPLE_S('family',
'http://www.example.org/family/Jack',
'http://www.w3.org/1999/02/22-rdf-syntax-ns#type',
'http://www.example.org/family/Male'));
execute Query again:
SELECT m MALES
FROM TABLE(SDO_RDF_MATCH(
'(?m rdf:type :Male)',
SDO_RDF_Models('family'), null,
SDO_RDF_Aliases(SDO_RDF_Alias('','http://www.example.org/family/')), null));
results :
MALES
http://www.example.org/family/Jack
http://www.example.org/family/Tom
but the problem is when again i close and start a new session in "sql plus" and execute the "SELECT" query i get:
MALES
http://www.example.org/family/Tom
instead of
MALES
http://www.example.org/family/Jack
http://www.example.org/family/Tom
Any idea why its not pulling both the statements in the first place.
thanks chandra

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Thanks,
Edited by: Jaya.ilankovan on Nov 28, 2011 1:26 PM

Jaya.ilankovan wrote:
Hi,
How to findout the sql statement output size...?
We are having large amount of data in one of my master table, when i run the query it showing large amount of data in that columns. so i required the size of output columns...?
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Hi Narly,
In answer to:
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as title~
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Hi,
In a UTF-8 database, I've created two testing tables, one that uses byte length semantics (BLS) for its CHAR and VARCHAR2 columns, and one using character length semantics (CLS). If I use the standard JDBC DatabaseMetdata.getColumns() query, the size of the CLS columns is reported as 4 times that of the BLS columns. I don't believe this is the desired behaviour for the JDBC drivers.
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import java.sql.*;
import java.util.*;
The following script can be used to create two test tables, the first with
byte-size columns, and the second with character-size columns.
CREATE TABLE TMP
TMP_ID NUMBER(12) NOT NULL PRIMARY KEY,
TMP_CHAR CHAR(200 BYTE),
TMP_VCHAR VARCHAR2(100 BYTE)
CREATE TABLE TMP2
TMP_ID NUMBER(12) NOT NULL PRIMARY KEY,
TMP_CHAR CHAR(200 CHAR),
TMP_VCHAR VARCHAR2(100 CHAR)
public class DatabaseMetadata
private static final String COLUMN_NAMES[] = {
"TABLE_CAT",
"TABLE_SCHEM",
"TABLE_NAME",
"COLUMN_NAME",
"DATA_TYPE",
"TYPE_NAME",
"COLUMN_SIZE",
"BUFFER_LENGTH",
"DECIMAL_DIGITS",
"NUM_PREC_RADIX",
"NULLABLE",
"REMARKS",
"COLUMN_DEF",
"SQL_DATA_TYPE",
"SQL_DATETIME_SUB",
"CHAR_OCTET_LENGTH",
"ORDINAL_POSITION",
"IS_NULLABLE"
private static final int COLUMN_WIDTHS[] = {
10, // "TABLE_CAT",
11, // "TABLE_SCHEM",
10, // "TABLE_NAME",
11, // "COLUMN_NAME",
10, // "DATA_TYPE",
10, // "TYPE_NAME",
11, // "COLUMN_SIZE",
13, // "BUFFER_LENGTH",
13, // "DECIMAL_DIGITS",
13, // "NUM_PREC_RADIX",
10, // "NULLABLE",
10, // "REMARKS",
10, // "COLUMN_DEF",
10, // "SQL_DATA_TYPE",
10, // "SQL_DATETIME_SUB",
10, // "CHAR_OCTET_LENGTH",
10, // "ORDINAL_POSITION",
10, // "IS_NULLABLE"
private static final char WHITESPACE[] =
.toCharArray();
private static final String HYPHENS =
private static String formatRow(String row[])
StringBuffer buffer = new StringBuffer(128);
for (int j=0;j<row.length;j++)
if (j > 0)
buffer.append(" | ");
String text = row[j];
int width = COLUMN_WIDTHS[j];
if (text == null)
buffer.append(WHITESPACE, 0, width);
else if (text.length() > width)
buffer.append(text.substring(0, width));
else
buffer.append(text).append(WHITESPACE, 0, width - text.length());
} // j
return buffer.toString();
} // private static String formatRow(String[])
private static void printColumnMetadata(
DatabaseMetaData metadata, String tableName)
throws SQLException
System.out.println("\n" + tableName + "\n");
System.out.println(formatRow(COLUMN_NAMES));
String hyphens[] = new String[18];
Arrays.fill(hyphens, HYPHENS);
System.out.println(formatRow(hyphens));
ResultSet results = metadata.getColumns(null, null, tableName, "%");
String columnMetadata[] = new String[18];
while (results.next())
for (int i=0;i<18;i++)
Object result = results.getObject(i+1);
columnMetadata[i] = result == null ? "NULL" : result.toString();
} // i
System.out.println(formatRow(columnMetadata));
results.close();
} // private static void printColumnMetadata(DatabaseMetaData, String)
public static void main(String argv[])
throws Exception
Driver driver = (Driver)Class.forName(
"oracle.jdbc.driver.OracleDriver").newInstance();
DriverManager.registerDriver(driver);
Connection connection = DriverManager.getConnection(
argv[0], argv[1], argv[2]);
// ((oracle.jdbc.OracleConnection)connection).setRemarksReporting(true);
try
DatabaseMetaData metadata = connection.getMetaData();
printColumnMetadata(metadata, "TMP");
printColumnMetadata(metadata, "TMP2");
catch (SQLException e)
e.printStackTrace();
connection.close();
} // public class DatabaseMetadata

It appears that this forum uses "[" "i" "]" to denote italics internally, so these characters are missing where the code sample becomes italic, between 'columnMetadata' and '='.

How to execute a Query which exceeds 32K size?

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How can i execute the procedure contains dynamic query(>32k size) and get the result set through REF CURSOR type o/p parameter?
I heared that it's possible through DBMS_SQL.PARSE() procedure. If it so, explain me in detail.
Thanks!

http://htmldb.oracle.com/pls/otn/f?p=2853:4:9265445064393730839::NO::P4_QA_ID:401

Error while executing query longer thank 32K using dbms_sql

Hi,
I'm using oracle database version is 10.2.0.4.0
I've a query of size 41K.
I can't run it with execute immediate, so when I'm running it with dbms_sql I'm getting error -
ORA-06502: PL/SQL: numeric or value error.
But when I'm running it in my pl/sql developer it is running fine.
Code snippet is below
-- Created on 24/05/2010 by TSHARMA
declare
-- Local variables here
cursor_name INTEGER;
i integer;
tc clob;
begin
-- Test statements here
select col1 into tc from temp where a1 = 't1'; --getting the long query from a temp table
tc := 'create table temp1 as ' || tc;
cursor_name := dbms_sql.open_cursor;
DBMS_SQL.PARSE(cursor_name, tc, DBMS_SQL.NATIVE);
i := DBMS_SQL.EXECUTE(cursor_name);
DBMS_SQL.CLOSE_CURSOR(cursor_name);
end;
-------------------------------

Hi,
DBMS_SQL.PARSE is overloaded to accept a VARCHAR2A as the statement parameter. This is a table of VARCHAR2(32767) which can be built up using your long query. I've written the following to handle long CLOB's. Just call the execute_sql procedure passing in the long sql:
PROCEDURE execute_sql (p_sql IN CLOB) IS
   l_sql_table DBMS_SQL.VARCHAR2a;
   l_ds_cursor PLS_INTEGER;
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BEGIN
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   l_ds_cursor := DBMS_SQL.OPEN_CURSOR;
   DBMS_SQL.PARSE(l_ds_cursor, l_sql_table, l_sql_table.FIRST, l_sql_table.LAST, FALSE, DBMS_SQL.NATIVE);
   l_ret_val := DBMS_SQL.EXECUTE(l_ds_cursor);
   DBMS_SQL.CLOSE_CURSOR(l_ds_cursor);
END execute_sql;
FUNCTION populate_sql_table (p_sql IN CLOB) RETURN DBMS_SQL.VARCHAR2a IS
   l_buffer_length CONSTANT PLS_INTEGER := 32767;
   l_lob_length PLS_INTEGER;
   l_offset PLS_INTEGER := 1;
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BEGIN
   l_sql_table.DELETE;
   l_lob_length := DBMS_LOB.GETLENGTH(p_sql);
   LOOP
      IF l_buffer_length > l_lob_length THEN
         l_amount := l_lob_length;
      END IF;
      l_sql_table(NVL(l_sql_table.LAST, 0) + 1) := DBMS_LOB.SUBSTR(p_sql, l_amount, l_offset);
      l_offset := l_offset + l_buffer_length;
      l_lob_length := l_lob_length - l_amount;
      IF l_lob_length <= 0 THEN
         EXIT;
      END IF;
   END LOOP;
   RETURN(l_sql_table);
END populate_sql_table;Hope that helps

SDO_RDF_MATCH() query pattern size

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