Creating INDEX on a BLOB column in a separate tablespace

Similar Questions

• Create indexes for an XMLType column.

  Hello
  
  I have a table that has a column of XMLType, the XSD is saved in DB. The XML is something like -
  
  < primary >
  < sub1 >
  < child1_1 / >
  < child1_2 / >
  < child1_3 / >
  < / sub1 >
  < sub2 >
  < child2_1 / >
  < child2_2 / >
  < child2_3 / >
  < / sub2 >
  < sub3 >
  < child31_1 / >
  < child3_2 / >
  < child3_3 / >
  < / sub3 >
  < / elementary school >
  
  I want to create indexes for child nodes. I read THAT XML structure cannot have collection as index it should be singleton.
  So can someone tell me no work around to create indexes for these nodes, or whatever it is that I missed as follows.
  
  Thank you

  #1. Since you're on 11g stop using the syntax of depricated... (extractValue, table (xmlsequence))

  SQL> create table PURCHASEORDER_TAB
    2  (
    3    PID number(4),
    4    PURCHASEORDER XMLTYPE
    5  )
    6  xmltype column PURCHASEORDER
    7  store as OBJECT RELATIONAL
    8  XMLSCHEMA "http://localhost:80/publishedContent/SB-XML/xsd/2010/purchaseOrder.xsd" Element "PurchaseOrder"
    9  /
  
  Table created.
  
  SQL> select table_name, table_type_name
    2  from user_nested_tables where parent_table_name = 'PURCHASEORDER_TAB';
  
  TABLE_NAME                     TABLE_TYPE_NAME
  ------------------------------ ------------------------------
  SYS_NTdmDOdAAMQsuXdRy6lc0H/A== Action64442_COLL
  SYS_NT8EIzAbUOQFGN2u6hCXP39g== LineItem64443_COLL
  
  SQL> rename "SYS_NT8EIzAbUOQFGN2u6hCXP39g==" to LINEITEM_NT
    2  /
  
  Table renamed.
  
  SQL> create index QTY_INDEX on LINEITEM_NT ("Quantity");
  
  Index created.
  
  SQL> set autotrace on explain lines 250 pages 50 trimspool on
  SQL> --
  SQL> select t.pid, quantity
    2    from PURCHASEORDER_TAB t,
    3         XMLTABLE
    4         (
    5           '/PurchaseOrder/LineItems/LineItem'
    6           passing t.PURCHASEORDER
    7           columns
    8           QUANTITY number(4) path 'Quantity'
    9         )
   10   where QUANTITY = 3
   11  /
  
  no rows selected
  
  Execution Plan
  ----------------------------------------------------------
  Plan hash value: 1929272390
  
  --------------------------------------------------------------------------------------------------
  | Id  | Operation                    | Name              | Rows  | Bytes | Cost (%CPU)| Time     |
  --------------------------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT             |                   |     1 |    46 |     3   (0)| 00:00:01 |
  |   1 |  NESTED LOOPS                |                   |       |       |            |          |
  |   2 |   NESTED LOOPS               |                   |     1 |    46 |     3   (0)| 00:00:01 |
  |*  3 |    TABLE ACCESS FULL         | LINEITEM_NT       |     1 |    23 |     2   (0)| 00:00:01 |
  |*  4 |    INDEX UNIQUE SCAN         | SYS_C00429284     |     1 |       |     0   (0)| 00:00:01 |
  |   5 |   TABLE ACCESS BY INDEX ROWID| PURCHASEORDER_TAB |     1 |    23 |     1   (0)| 00:00:01 |
  --------------------------------------------------------------------------------------------------
  
  Predicate Information (identified by operation id):
  ---------------------------------------------------
  
     3 - filter(CAST(TO_NUMBER(TO_CHAR("Quantity")) AS number(4) )=3)
     4 - access("NESTED_TABLE_ID"="T"."SYS_NC0002900030$")
  
  Note
  -----
     - dynamic sampling used for this statement (level=2)
  
  SQL> select t.pid, quantity
    2    from PURCHASEORDER_TAB t,
    3         XMLTABLE
    4         (
    5           '/PurchaseOrder/LineItems/LineItem'
    6           passing t.PURCHASEORDER
    7           columns
    8           QUANTITY number(12,4) path 'Quantity'
    9         )
   10   where QUANTITY = 3
   11  /
  
  no rows selected
  
  Execution Plan
  ----------------------------------------------------------
  Plan hash value: 3093486066
  
  --------------------------------------------------------------------------------------------------
  | Id  | Operation                    | Name              | Rows  | Bytes | Cost (%CPU)| Time     |
  --------------------------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT             |                   |     1 |    46 |     2   (0)| 00:00:01 |
  |   1 |  NESTED LOOPS                |                   |       |       |            |          |
  |   2 |   NESTED LOOPS               |                   |     1 |    46 |     2   (0)| 00:00:01 |
  |   3 |    TABLE ACCESS FULL         | PURCHASEORDER_TAB |     1 |    23 |     2   (0)| 00:00:01 |
  |*  4 |    INDEX RANGE SCAN          | QTY_INDEX         |     1 |       |     0   (0)| 00:00:01 |
  |*  5 |   TABLE ACCESS BY INDEX ROWID| LINEITEM_NT       |     1 |    23 |     0   (0)| 00:00:01 |
  --------------------------------------------------------------------------------------------------
  
  Predicate Information (identified by operation id):
  ---------------------------------------------------
  
     4 - access("Quantity"=3)
     5 - filter("NESTED_TABLE_ID"="T"."SYS_NC0002900030$")
  
  Note
  -----
     - dynamic sampling used for this statement (level=2)
  
  SQL> select t.pid, quantity
    2    from PURCHASEORDER_TAB t,
    3         XMLTABLE
    4         (
    5           '/PurchaseOrder/LineItems/LineItem'
    6           passing t.PURCHASEORDER
    7           columns
    8           QUANTITY path 'Quantity'
    9         )
   10   where QUANTITY = 3
   11  /
  
  no rows selected
  
  Execution Plan
  ----------------------------------------------------------
  Plan hash value: 3093486066
  
  --------------------------------------------------------------------------------------------------
  | Id  | Operation                    | Name              | Rows  | Bytes | Cost (%CPU)| Time     |
  --------------------------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT             |                   |     1 |    46 |     2   (0)| 00:00:01 |
  |   1 |  NESTED LOOPS                |                   |       |       |            |          |
  |   2 |   NESTED LOOPS               |                   |     1 |    46 |     2   (0)| 00:00:01 |
  |   3 |    TABLE ACCESS FULL         | PURCHASEORDER_TAB |     1 |    23 |     2   (0)| 00:00:01 |
  |*  4 |    INDEX RANGE SCAN          | QTY_INDEX         |     1 |       |     0   (0)| 00:00:01 |
  |*  5 |   TABLE ACCESS BY INDEX ROWID| LINEITEM_NT       |     1 |    23 |     0   (0)| 00:00:01 |
  --------------------------------------------------------------------------------------------------
  
  Predicate Information (identified by operation id):
  ---------------------------------------------------
  
     4 - access("Quantity"=3)
     5 - filter("NESTED_TABLE_ID"="T"."SYS_NC0002900030$")
  
  Note
  -----
     - dynamic sampling used for this statement (level=2)
  
  SQL> SELECT t.pid, extractValue(Value(sta),'/LineItem/Quantity')
    2    FROM PURCHASEORDER_TAB t,
    3    table(xmlsequence(extract(t.purchaseOrder,'/PurchaseOrder/LineItems/LineItem'))) sta
    4    WHERE extractValue(Value(sta),'/LineItem/Quantity')= 3
    5  /
  
  no rows selected
  
  Execution Plan
  ----------------------------------------------------------
  Plan hash value: 3093486066
  
  --------------------------------------------------------------------------------------------------
  | Id  | Operation                    | Name              | Rows  | Bytes | Cost (%CPU)| Time     |
  --------------------------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT             |                   |     1 |    46 |     2   (0)| 00:00:01 |
  |   1 |  NESTED LOOPS                |                   |       |       |            |          |
  |   2 |   NESTED LOOPS               |                   |     1 |    46 |     2   (0)| 00:00:01 |
  |   3 |    TABLE ACCESS FULL         | PURCHASEORDER_TAB |     1 |    23 |     2   (0)| 00:00:01 |
  |*  4 |    INDEX RANGE SCAN          | QTY_INDEX         |     1 |       |     0   (0)| 00:00:01 |
  |*  5 |   TABLE ACCESS BY INDEX ROWID| LINEITEM_NT       |     1 |    23 |     0   (0)| 00:00:01 |
  --------------------------------------------------------------------------------------------------
  
  Predicate Information (identified by operation id):
  ---------------------------------------------------
  
     4 - access("Quantity"=3)
     5 - filter("NESTED_TABLE_ID"="T"."SYS_NC0002900030$")
  
  Note
  -----
     - dynamic sampling used for this statement (level=2)
  
  SQL>
  

  Note the first example XMLTable does not use the index because the data type of AMOUNT is given wrong...

• Creating indexes in the XMLType column

  Hello
  
  I have the following for XML document stored as an XMLType column.
  
  < ocaStatus xmlns = "http://xmlbeans.apache.org/ocastatus" > < status > < > 934 statusCode < / statusCode > < statusDate > Wed Apr 07 16:05:53 GMT + 05:30 2010 < / statusDate > < userId > u0121845 < / userId > < comment > sent to FLC < / comment > < / status > < status > < statusCode > 934 < / statusCode > < statusDate > Wed Apr 07 15:58:25 GMT + 05:30 2010 < / statusDate > < userId > u0121845 < / username > < Comment > sent to FLC < / comment > < / status > < status > < statusCode > 934 < / statusCode > < statusDate > Wed Apr 07 15:54:02 GMT + 05:30 2010 < / statusDate > < userId u0121845 > < / userId > < comment > sent to FLC < / comment > < / status > < status > < statusCode > 750 < / statusCode > < statusDate > 2010 - 03 - 31 12:39:41.580 GMT + 05:30 < / statusDate > < u0121845 userId > < / userId > < comment > metadata of the Document is correct. < / comment > < / status > < status > < statusCode > 934 < / statusCode > < statusDate > 2010 - 03 - 31 12:39:41.580 GMT + 05:30 < / statusDate > < userId > u0121845 < / userId > < comment > sent to FLC < / comment > < / status > < status > < statusCode > 932 < / statusCode > < statusDate > 2010 - 03 - 31 12:39:41.580 GMT + 05:30 < / statusDate > < userId > u0121845 < / username > < comment > loaded Novus < /. comment > < / status > < status > < > 700 statusCode < / statusCode > < statusDate > 2010 - 03 - 31 12:39:41.580 GMT + 05:30 < / statusDate > < userId u0121845 > < / userId > < comment > Document is deleted from the OCA. < / comment > < / status > < / ocaStatus >
  
  I created as a result of the clues in the XML
  CREATING INDEX 'OCA_DEV '. "' OCA_STATUS_CODE_INDEX ' ON 'OCA_DEV '. "DOCUMENT_STATUS_XML"(EXTRACTVALUE('/ocaStatus/status/statusCode'));
  CREATING INDEX 'OCA_DEV '. "' OCA_STATUS_DATE_INDEX ' ON 'OCA_DEV '. "DOCUMENT_STATUS_XML"(EXTRACTVALUE('/ocaStatus/status/statusDate'));
  
  However, the problem is that I will be having several status within each XML that violates the indexing.
  Is there a way I can still create indexes for multiple State values in each XML file?
  
  Thanks in advance.

  Hello

  Take a look at the manual xdb (which version do you use?), for the 10.2 version, see: http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14259/xdb04cre.htm#sthref596
  It describes how you can index an XMLTYPE. Because you describe how you use, take a look at your needs.

  In 11G, you have the XMLINDEX to xmltypes indexing, you will find information here: http://download.oracle.com/docs/cd/E11882_01/appdev.112/e10492/xdb_indexing.htm#CHDFCGGI

  Herald tiomela
  Superconsult.nl

• How to create table containe blob column view?

  Hi, I would like to aske any type of blob data
  I have data containe blob clolumn type table
  
  I want to create view this table how do?
  and
  
  
  If I created the table view blob column data will be responsible for memory or what because that will cause some performance issues because the table contains enormous data?
  
  
  Thank you

  You must create the view as

    CREATE OR REPLACE VIEW 
    AS
       SELECT col1, col2, col3.....
       FROM    
       WHERE   
       ...etc...
  

  The Act of creating the view will not otherwise the data in the table underlying, all it will do is create a view definition.
  Select only the view will select data.

  If you don't need to select the BLOB column in the view, then you would not include it in the list of the columns in the view definition.
  If your LOB data are stored online, then it may be a significant selection of the view, even if the BLOB column is not indicated in the list of the columns in the view.

  Published by: dombrooks on June 1, 2009 10:12

• Creating Index on another table in schema stored in my table

  Hello
  I want to create indexes on a table column that is in another schema of my schema and index will be stored in my diagram.
  
  ex: the current user 'hr '.
  SQL > create index idx1 on scott.emp (eno);
  
  Does the above query?
  
  Thank you
  Sri

  SQL> conn
  Enter user-name: hr@****
  Enter password:
  Connected.
  SQL> create index ndx on scott.emp(sal);
  
  Index created.
  
  SQL> show user
  USER is "HR"
  
  SQL> select index_name from user_indexes where index_name = 'NDX';
  
  INDEX_NAME
  ------------------------------
  NDX
  

• Doubt in create index.

  Hello
  I tried to create indexes on the same column in the same table as below, and I could see the difference also as below.
  When I gave 'BR_CODE', in dba_ind_columns, it appears as SYS_NC00082$. Why is it so? Can you get it someone please let me know the difference?
  
  create index IDX_BRCODE on BCT (BR_CODE, BANK_CODE);
  
  The index is created.
  
  SQL > select index_name, column_name from dba_ind_columns where table_name = "BCT";
  
  INDEX_NAME COLUMN_NAM
  ------------------------------ ----------
  IDX_BRCODE BR_CODE
  IDX_BRCODE BANK_CODE
  
  create index IDX_BRCODE1 on BCT ('BR_CODE', BANK_CODE);
  
  The index is created.
  
  SQL > select index_name, column_name from dba_ind_columns where table_name = "BCT";
  
  INDEX_NAME COLUMN_NAM
  ------------------------------ ----------
  IDX_BRCODE BR_CODE
  IDX_BRCODE BANK_CODE
  IDX_BRCODE1 SYS_NC00082$
  
  IDX_BRCODE1 BANK_CODE

  user10698496 wrote:
  Once again great explanation in a way more easy to understand for beginners like me.

  Another question. If BANK_CODE is a nullable column, how will be the index with the constant "BR_CODE" (I want to say index ("BR_CODE", BANK_CODE)) help in select queries with BANK_ID in where clause?

  For example:-select col1 from bct where bank_id = 'x' and br_code = 'y '? -In this query will be how this constant index thanks to 'BR_CODE '? How does this index for this query?

  CBO will not use index (in normal case) when the indexed column is null. But you can create INDEXES of DATABASE FUNCTION and can for the use of this. In the structure of your query and index are different. Use of the index when the query predicate is match your index (without other intervention) structure. So for your query, it will not work.

• estimate the amount of temporary space for FEPs tbl creating index

  my temp tablespace is 32 GB and index estimated to be as big as 55GO, I need more room temp? That is to say at least 55 GB?
  I'm going todo
  
  CREATE a TEMPORARY TABLESPACE ts_tmp
  TEMPFILE 'E:\temp01.dbf' SIZE 10000M
  REUSE AUTOEXTEND ON LOCAL MANAGEMENT MEASURE;
  
  ALTER USER myuser TEMPORARY TABLESPACE ts_tmp;
  
  CREATING index...
  Temp ALTER USER myuser TABLESPACE TEMPORARY;
  DROP TABLESPACE ts_tmp;
  
  VA - I've seen any difficulty in return put the temporary tableapace for temp myuser and drop the newly created temporary tablespace?
  
  Published by: user9198889 on November 29, 2011 07:56

  user9198889 wrote:
  my temp tablespace is 32 GB and index estimated to be as big as 55GO, I need more room temp? That is to say at least 55 GB?

  Yes

• Table exists but still error: ORA-00942, isn't able to create indexes: Help

  It's my script... the table FLASH_SALES_BY_STORE_AND_HOUR exist in my database, so why I get the error message.
  ERROR on line 1:
  ORA-00942: table or view does not exist
  
  
  
  Here is my script.
  
  ASK for IDX_SALES_STORE_DEL
  
  CREATE INDEX IDX_SALES_STORE_DEL ON FLASH_SALES_BY_STORE_AND_HOUR (STORE_ID, TRUNC (LOCAL_DATE))
  TABLESPACE 'FLASH '.
  STORAGE
  (
  DEFAULT USER_TABLES
  )
  /
  
  QUICK creation IDX_SALES_STORE_VIEWexit
  
  
  CREATE INDEX IDX_SALES_STORE_VIEW ON FLASH_SALES_BY_STORE_AND_HOUR (STORE_ID, TRUNC (LOCAL_DATE), DEPARTMENT)
  TABLESPACE 'FLASH '.
  STORAGE
  (
  DEFAULT USER_TABLES
  )
  /

  Please, re - run the script as the user who owns the table...

  Otherwise, add the schema name before the name of the index (if not index will be created under SYS) and table name (since you missed the creation of synonym).

  HTH,
  Thierry

• blob column field index

  SQL > select * from v version $;
  
  BANNER
  
  Oracle Database 10g Release 10.2.0.4.0 - Production
  PL/SQL Release 10.2.0.4.0 - Production
  CORE 10.2.0.4.0 Production
  AMT for Mac OS X Server: release 10.2.0.4.0 - Production
  NLSRTL Version 10.2.0.4.0 - Production
  
  SQL > documents desc;
  Name Null? Type
  IDENTIFICATION NUMBER
  TITLE VARCHAR2 (100)
  FILENAME VARCHAR2 (200)
  BLOB OF DOCUMENT
  
  SQL > create index idx_documents
  2 documents (document)
  3 indextype is ctxsys.context;
  
  The index is created.
  
  SQL > exec ctx_ddl.sync_index ('IDX_DOCUMENTS');
  
  PL/SQL procedure successfully completed.
  
  SQL > Select token_text of Dr.$ idx_documents$ i;
  
  no selected line
  
  SQL > Select file name of documents;
  
  FILE NAME
  --------------------------------------------------------------------------------
  Axiom.txt
  test.txt
  
  SQL >
  
  Axiom.txt:
  ----------
  Nach der Installation wird als Axiom MIDI-Gerät mit zwei MIDI-Eingangen und einem MIDI-exit auf Ihrem Computer gefuhrt.
  Fur den Einsatz von axiom mit will host application must the first der Sie in der Eingangsliste aufgefuhrten noon-Eingange
  von Axiom MIDI-Eingabegerat als Park. Erst nach dieser Einstellung kann Ihre host application MIDI - und Notenbefehle
  -Controllerbefehle von Axiom only.
  
  Falls Sie ein external MIDI-Gerät (Drum Machine oder equipped keyboard) a MIDI-digitization den von Axiom angeschlossen haben.
  können Sie Axiom als simply MIDI-USB-Interface, indem Sie den second wins der in der list aufgefuhrten Axiom-Eingange als MIDI -.
  Eingabegerat aktivieren.
  Like können Sie ein external, a MIDI-exit dem von Axiom angeschlossenes MIDI-Gerät über die application-host ansteuern und
  ALS axiom MIDI-USB-Interface benefits. There must Sie Axiom MIDI-Ausgabegerat als Park. Further notices zu diesen
  Is find in den nachfolgenden Handbuchs Kapiteln sharps.
  
  Die EuGHMR der to hear MIDI-Ein-und von Axiom unter den individual functionality sind der nachstehenden Tabelle unit
  aufgefuhrt. Calendar Sie Bitte, dass sharp positions you can hear, I depending on ob Sie am PC oder am Mac arbeiten bzw. den
  Windows-Multi-Client-Treiber installed haben oder nicht. (Information zur Treiber-Installation und - configuration items
  Sie in den nachfolgenden Kapiteln.)
  
  Select Dr. token_text $ idx_documents$, I am not returned no line! The same text stored in a clob column works fine.
  
  Thanks in advance

  The filter has failed.

  Because you use a BLOB column, it will try to invoke the filter of binary document (INSO_FILTER or AUTO_FILTER depending on the version).

  The filter SHOULD be able to deal with plain text documents, but who knows what kind of problems of translation of characters you'll have when writing a document in plain text in a binary container.

  If you only use plain text documents, you must use a CLOB column. Alternatively, you can try specifying the FILTER CTXSYS. NULL_FILTER in a parameters clause, but there still may be problems of translation.

  If you need to index a combination of binary and plain text documents, then try this again with a file binary document - a PDF or DOC file for example. If those who fail this way then it is probably your method of loading that is at fault.

• create indexes on the upper part of the column - reminders function is not deterministic

  Hi all

  I'm having a problem on a database. When you create an index on an existing table on the upper part of a column, Oracle triggers an ORA-30553. I've done this 40 index other databases, with the same and different versions, without problem. When you create the index on a copy of the table, it is created with success...

  Here is the code:

  SQL > select * from v version $;

  BANNER

  --------------------------------------------------------------------------------

  Oracle Database 11 g Release 11.2.0.3.0 - 64 bit Production

  PL/SQL Release 11.2.0.3.0 - Production

  CORE Production 11.2.0.3.0

  AMT for 64-bit Windows: Version 11.2.0.3.0 - Production

  NLSRTL Version 11.2.0.3.0 - Production

  SQL > CREATE INDEX IDX_SRE_E_MAIL_UPPER on fsynrelatie (upper (sre_e_mail)) tablespace idx;

  CREATE the INDEX IDX_SRE_E_MAIL_UPPER on idx tablespace fsynrelatie (upper (sre_e_mail))

  *

  ERROR on line 1:

  ORA-30553: the function is not deterministic

  SQL > create table fsynrelatie2 in select * from fsynrelatie;

  Table created.

  SQL > CREATE INDEX IDX_SRE_E_MAIL_UPPER on fsynrelatie2 (upper (sre_e_mail)) tablespace idx;

  The index is created.

  SQL > drop table fsynrelatie2;

  Deleted table.

  SQL > show parameter query_rewrite_enabled

  VALUE OF TYPE NAME

  ------------------------------------ ----------- ------------------------------

  query_rewrite_enabled string TRUE

  Hi all

  Thank you for the answers. I found the problem:

  On the table, there are 54 index:

  Select index_type, uniqueness, count (*) from user_indexes where table_name = 'FSYNRELATIE '.

  Index_type group, uniqueness

  INDEX_TYPE	SINGLE CHARACTER	COUNT (*)
  FIELD	ARE NOT UNIQUE	1
  BASED ON A NORMAL FUNCTION	ARE NOT UNIQUE	4
  NORMAL	UNIQUE	3
  NORMAL	ARE NOT UNIQUE	46

  3 unique indexes are the primary key and 2 another witch number field contains unique identifiers for rows in other systems. The domain index is an index of Oracle text on a couple of fields. There are 3 indices of function based on a high on a field and 1 on an individual function. This last clue has caused the problem. Apparently, on the creation, this function is deterministic, but when rolling a new version of the software. It became a non-deterministic function. When I delete the index, my original index on upper (sre_e_mail) has been created successfully! Now, I did the deterministic function again and could recreate the function without problem.

  Thanks for your comments!

• How to create indexes on columns all - the flames begin

  Yes read you it correctly.

  Is it possible to create a procedure that will create an index on each column in a table without specifying the column names?

  index_all_cols exec ('xxx', 'parallel');

  You ask why? There is no reason that I can give you that will quench the flames coming my way. But, finally, it's because (1) I am tired of using excel to generate create statements of the index and (2) I want the speed at the expense of everything else, (3) I do not use a mouse... I know, I would hate first.

  Jason

  Oracle 10g

  ... at least I didn't to index every column in every table in my diagram!

  Had, it works!

  CREATE OR REPLACE PROCEDURE index_all_cols (pTABLENAME IN varchar2)

  IS

  CURSOR c1 IS SELECT distinct COLUMN_NAME FROM USER_TAB_COLS WHERE TABLE_NAME = pTABLENAME;

  BEGIN

  FOR c IN c1 LOOP

  BEGIN EXECUTE IMMEDIATE 'create index X_ "| c.COLUMN_NAME |' WE ' | pTABLENAME | ' ('| c.COLUMN_NAME |') parallel logging ";

  -EXCEPTION WHILE some other THEN NULL;

  END;

  END LOOP;

  COMMIT;

  END index_all_cols;

  /

  ... and not even a flame

• How to create indexes on the column xmtype

  Hello
  
  I have a table as follows
  
  CREATE TABLE T_TEST_XML (ID_PROCESSUS NUMBER, TXT_XML XMLTYPE);
  
  
  I query the table above very frequently with the query
  
  SELECT * FROM TXS T_TEST_XML WHERE EXISTSNODE (TXS. TXT_XML, '/ order [status = "PEN"]') = 1
  
  
  How to create function function index on the TXT_XML column for the xpath expression/order [status = "PEN"]' to improve the query performance?
  
  Thank you

  In fact if you are limited to the use of older software

  1 consider to define an XML schema and store XML using storage relational object.

  or

  2. If you need to store XML as CLOB to create the index on extractValue(), rather than existsNode() and provide the underlying value at the SQL level rather than the XPATH level.

  SQL> DROP TABLE T_TEST_XML
    2  /
  
  Table dropped.
  
  SQL> CREATE TABLE T_TEST_XML (PROCESS_ID NUMBER, TXT_XML XMLTYPE)
    2  /
  
  Table created.
  
  SQL> create INDEX T_TEXT_XML_IDX on T_TEST_XML( extractValue(TXT_XML,'/order/status'))
    2  /
  
  Index created.
  
  SQL> set autotrace on explain
  SQL> --
  SQL> SELECT *
    2    FROM T_TEST_XML TXS
    3   WHERE ExistsNode(TXT_XML,'/order[status="PEN"]') = 1
    4  /
  
  no rows selected
  
  Execution Plan
  ----------------------------------------------------------
  Plan hash value: 3001212210
  
  ---------------------------------------------------------------------------------
  | Id  | Operation          | Name       | Rows  | Bytes | Cost (%CPU)| Time     |
  ---------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT   |            |     1 |  2017 |    31   (0)| 00:00:01 |
  |   1 |  NESTED LOOPS SEMI |            |     1 |  2017 |    31   (0)| 00:00:01 |
  |   2 |   TABLE ACCESS FULL| T_TEST_XML |     1 |  2015 |     2   (0)| 00:00:01 |
  |*  3 |   XPATH EVALUATION |            |       |       |            |          |
  ---------------------------------------------------------------------------------
  
  Predicate Information (identified by operation id):
  ---------------------------------------------------
  
     3 - filter("P"."C_01$"='PEN')
  
  Note
  -----
     - dynamic sampling used for this statement (level=2)
  
  SQL> SELECT *
    2    FROM T_TEST_XML TXS
    3   WHERE extractValue(TXT_XML,'/order/status') = 'PEN'
    4  /
  
  no rows selected
  
  Execution Plan
  ----------------------------------------------------------
  Plan hash value: 1430727070
  
  ----------------------------------------------------------------------------------------------
  | Id  | Operation                   | Name           | Rows  | Bytes | Cost (%CPU)| Time     |
  ----------------------------------------------------------------------------------------------
  |   0 | SELECT STATEMENT            |                |     1 |  2015 |     1   (0)| 00:00:01 |
  |   1 |  TABLE ACCESS BY INDEX ROWID| T_TEST_XML     |     1 |  2015 |     1   (0)| 00:00:01 |
  |*  2 |   INDEX RANGE SCAN          | T_TEXT_XML_IDX |     1 |       |     1   (0)| 00:00:01 |
  ----------------------------------------------------------------------------------------------
  
  Predicate Information (identified by operation id):
  ---------------------------------------------------
  
     2 - access(EXTRACTVALUE(SYS_MAKEXML(0,"SYS_NC00003$"),'/order/status',null,0,0,5242
                93,133120)='PEN')
  
  Note
  -----
     - dynamic sampling used for this statement (level=2)
  
  SQL>
  SQL>
  SQL>
  SQL>
  SQL>
  SQL>
  

  This allows the index press questioning on any status value, rather than just the PEN

• Created index with DESC with USER_IND_COLUMNS. COLUMN = ' SYS_NC00023$ '.

  On Oracle 11.2, I observed below
  

  create index ind_jperson_1 on d_jperson(convict_ref);
  create index ind_jperson_2 on d_jperson(driver_ref DESC);
  
  select index_name,table_name,column_name,column_position,descend
    from USER_IND_COLUMNS where  table_name='D_JPERSON'
  
  INDEX_NAME     TABLE_NAME     COLUMN_NAME     COLUMN_POSITION     DESCEND
  IND_JPERSON_2     D_JPERSON     SYS_NC00023$     1     DESC
  IND_JPERSON_1     D_JPERSON     CONVICT_REF     1     ASC

  How to find the true picture of this index column?

  Hello

  DBA_IND_EXPRESSIONS can help you find the real column name.

  And it is an expected behavior in Oracle. Have you noticed anything else pre 11.

  Concerning
  Anurag

• Creating indexes for the table

  can someone help me how to create indexes in the table. I m creating own table... I need to select a particular field in the table. So I need to calculate the index position. I use my code like this,

  This will returnthe number of columns in the table.

  Class array

  {

  private int Table_Index()
  {
  for (int x = 0; x)<>
  {
  table_index = x;
  }
  Return table_index;
  }

  }

  MainClass can I get this length of Index

  Table T1;

  int t1 is T1. Table_Index();

  This property returns my length (4) of table column

  Using this index (t1) I HAV to see what position I'm at table now...

  someone help me...

  You can use a listfield, he supports methods to get the selected row and its contents.

• compress the blob column to save space on the server

  Hi friends,

  I have a problem with the blob column, in the oracle 11.2.0.4 on aix Server database

  I have a table with a blob of column (containing a jpg file). This table is in a tablespace of 300 GB and storage space is full. There is no space on the server (asm).

  I need to load the jpg more in this table, but there is no space.

  I've read a few articles on tha compress blob type column, but I'm not sure what I should do.

  Is it possible to compress the blob column without going to a different tablespace (because the server has no more space to create a new one).

  The table and column have been created in a traditional way.

  Please, advice?

  Best regards

  Dbape.

  But this method requires add-on EA "Adv. Compression" ($$$).

  OP he wanted to compress .jpg files.

  BUDOKAI

  It is not possible.

  the .jpg files are already compressed.

  IIRC (of my Compression Adv. test) - SecureFile "knows best" and will not try to compress BLOBs identified as JPGs or any other known formats of files (such as .zip files)

  In other words - SecureFile is not the OP no good for the type of data, it is try to compress them.

  Are the only solutions that the OP has to enable it to store more JPG images

  • get rid of the old pictures
  • Add more disks
  • resize images (ordimage)
  • recompress the image by reducing the quality as long as the resulting image is unusable (ordimage)

  MK