Choose the XMLType storage option

Hi all

I work with an application that will be storing data using an XMLType column. The data being stored is a form with values for an arbitrary number of fields. We have an XSD that defines the different data types that can be stored. So in the document XML, type of the element node corresponds to the type of data stored and 'name' of the node attribute specifies the actual field recording. If a form which includes 2 text fields and 2 fields of type integer may have data like this:

<dataset>
  <textField name="text_field1">Text Data Here</textField>
  <textField name="text_field2">More Text Data Here</textField>
  <integerField name="int_field1">1</integerField>
  <inteferField name="int_field2">2</integerField>
</dataset>

The application will dynamically generate SQL queries to query the different values. Given in each XML document can also be updated / inserted by the application (although this generally will be for one record at a time so the performance for the insert / update is not as much a concern as aggregation queries). In addition, the system is changing for a previous request and that the data stored in a relational way. There will very probably be queries that create relational views out of the column of Type XML.

We currently have this implementation of object-relational storage. Does this sound correct? I can't say if we treat this as semi-structured storage instead. The scheme is well defined, but fields that are stored in each XML document are variable (so we know that data types ahead, just not the real fields). I would like to hear your comments on the type of storage that would be optimal. Any comment is appreciated...

Here is the solution of GOLD

SQL> connect &USERNAME/&PASSWORD
Connected.
SQL> --
SQL> VAR XMLSCHEMA CLOB
SQL> VAR INSTANCE CLOB
SQL> --
SQL> begin
  2          :XMLSCHEMA :=
  3  '
  4          
  5                  
  6                          
  7                                  
  8                                          
  9                                  
 10                          
 11                  
 12          
 13          
 14                  
 15                          
 16                                  
 17                                          
 18                                  
 19                          
 20                  
 21          
 22          
 23                  
 24                          
 25                                  
 26                                  
 27                          
 28                  
 29          
 30  ';
 31    :INSTANCE :=
 32  '
 33       Test1
 34       Test2
 35       1
 36       2
 37  ';
 38  end;
 39  /

PL/SQL procedure successfully completed.

Elapsed: 00:00:00.00
SQL> begin
  2    DBMS_XMLSCHEMA.registerSchema(
  3                     enablehierarchy  => DBMS_XMLSCHEMA.ENABLE_HIERARCHY_NONE ,
  4                     GENTYPES   => TRUE,
  5                     GENBEAN    => FALSE,
  6                     GENTABLES  => FALSE,
  7                     FORCE      => FALSE,
  8                     OWNER      => USER,
  9                     SCHEMAURL  => 'http://testurl.com/test.xsd',
 10                     SCHEMADOC  => XMLTYPE(:XMLSCHEMA)
 11                  );
 12  end;
 13  /

PL/SQL procedure successfully completed.

Elapsed: 00:00:00.44
SQL> create table TEST_DATA (
  2    REC_ID                NUMBER  NOT NULL,
  3    REC_DATA          XMLTYPE
  4  )
  5  xmltype REC_DATA
  6  STORE AS OBJECT RELATIONAL
  7  XMLSCHEMA "http://testurl.com/test.xsd"
  8  ELEMENT "dataset"
  9  /

Table created.

Elapsed: 00:00:00.08
SQL> set lines 80
SQL> --
SQL> desc TEST_DATA
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 REC_ID                                    NOT NULL NUMBER
 REC_DATA                                           SYS.XMLTYPE(XMLSchema "http:
                                                    //testurl.com/test.xsd" Elem
                                                    ent "dataset") STORAGE Objec
                                                    t-relational TYPE "dataset66
                                                    4_T"

SQL> --
SQL> begin
  2    DBMS_XMLSTORAGE_MANAGE.renameCollectionTable(USER,'TEST_DATA','REC_DATA','/dataset/textField','TEXT_FIELD_TABLE');
  3    DBMS_XMLSTORAGE_MANAGE.renameCollectionTable(USER,'TEST_DATA','REC_DATA','/dataset/integerField','INT_FIELD_TABLE');
  4  end;
  5  /

PL/SQL procedure successfully completed.

Elapsed: 00:00:01.65
SQL> column NAME format A32
SQL> --
SQL> set lines 80
SQL> --
SQL> desc TEXT_FIELD_TABLE
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 SYS_XDBPD$                                         XDB.XDB$RAW_LIST_T
 SYS_XDBBODY$                                       VARCHAR2(4000 CHAR)
 name                                               VARCHAR2(4000 CHAR)

SQL> --
SQL> desc INT_FIELD_TABLE
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 SYS_XDBPD$                                         XDB.XDB$RAW_LIST_T
 SYS_XDBBODY$                                       NUMBER(38)
 name                                               VARCHAR2(4000 CHAR)

SQL> --
SQL> create index TEXT_NAME_INDEX on TEXT_FIELD_TABLE("name")
  2  /

Index created.

Elapsed: 00:00:00.02
SQL> create index INT_NAME_INDEX on INT_FIELD_TABLE("name")
  2  /

Index created.

Elapsed: 00:00:00.00
SQL> set autotrace on explain
SQL> set lines 150 pages 100
SQL> --
SQL> insert into TEST_DATA values (1,XMLTYPE(:INSTANCE))
  2  /

1 row created.

Elapsed: 00:00:00.01

Execution Plan
----------------------------------------------------------
Plan hash value: 1

--------------------------------------------------------------------------------------
| Id  | Operation                | Name      | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------------------
|   0 | INSERT STATEMENT         |           |     1 |   100 |     1   (0)| 00:00:01 |
|   1 |  LOAD TABLE CONVENTIONAL | TEST_DATA |       |       |            |          |
--------------------------------------------------------------------------------------

SQL> commit
  2  /

Commit complete.

Elapsed: 00:00:00.00
SQL> select TEXT1, TEXT2, INT1, INT2
  2    from TEST_DATA,
  3         XMLTABLE(
  4           '/dataset'
  5            passing REC_DATA
  6            columns
  7              TEXT1 VARCHAR2(4000) path 'textField[@name="text_field1"]/text()',
  8              TEXT2 VARCHAR2(4000) path 'textField[@name="text_field2"]/text()',
  9              INT1      NUMBER(10) path 'integerField[@name="int_field1"]/text()',
 10              INT2      NUMBER(10) path 'integerField[@name="int_field1"]/text()'
 11           )
 12  /

TEXT1
------------------------------------------------------------------------------------------------------------------------------------------------------
TEXT2
------------------------------------------------------------------------------------------------------------------------------------------------------
      INT1       INT2
---------- ----------
Test1
Test2
         1          1

Elapsed: 00:00:00.07

Execution Plan
----------------------------------------------------------
Plan hash value: 1764375565

--------------------------------------------------------------------------------------------------------
| Id  | Operation                           | Name             | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT                    |                  |     1 |    20 |     7   (0)| 00:00:01 |
|*  1 |  TABLE ACCESS BY INDEX ROWID BATCHED| TEXT_FIELD_TABLE |     1 |  4014 |     1   (0)| 00:00:01 |
|*  2 |   INDEX RANGE SCAN                  | TEXT_NAME_INDEX  |     1 |       |     1   (0)| 00:00:01 |
|*  3 |  TABLE ACCESS BY INDEX ROWID BATCHED| TEXT_FIELD_TABLE |     1 |  4014 |     1   (0)| 00:00:01 |
|*  4 |   INDEX RANGE SCAN                  | TEXT_NAME_INDEX  |     1 |       |     1   (0)| 00:00:01 |
|*  5 |  TABLE ACCESS BY INDEX ROWID BATCHED| INT_FIELD_TABLE  |     1 |  2025 |     1   (0)| 00:00:01 |
|*  6 |   INDEX RANGE SCAN                  | INT_NAME_INDEX   |     1 |       |     1   (0)| 00:00:01 |
|*  7 |  TABLE ACCESS BY INDEX ROWID BATCHED| INT_FIELD_TABLE  |     1 |  2025 |     1   (0)| 00:00:01 |
|*  8 |   INDEX RANGE SCAN                  | INT_NAME_INDEX   |     1 |       |     1   (0)| 00:00:01 |
|   9 |  TABLE ACCESS FULL                  | TEST_DATA        |     1 |    20 |     3   (0)| 00:00:01 |
--------------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   1 - filter("NESTED_TABLE_ID"=:B1)
   2 - access("SYS_ALIAS_8"."name"='text_field1')
   3 - filter("NESTED_TABLE_ID"=:B1)
   4 - access("SYS_ALIAS_7"."name"='text_field2')
   5 - filter("NESTED_TABLE_ID"=:B1)
   6 - access("SYS_ALIAS_6"."name"='int_field1')
   7 - filter("NESTED_TABLE_ID"=:B1)
   8 - access("SYS_ALIAS_5"."name"='int_field1')

Note
-----
   - dynamic statistics used: dynamic sampling (level=2)

SQL>

Published by: mdrake on March 14, 2013 11:13

Tags: Database

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