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.

Tags: Database

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  <xs:element name="key" type="xs:string" oraxdb:propNumber="3796" oraxdb:global="true" oraxdb:SQLName="key" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:defaultTable="key747_TAB" oraxdb:defaultTableSchema="MYUSER"/>
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  <xs:element name="time" type="xs:integer" oraxdb:propNumber="3798" oraxdb:global="true" oraxdb:SQLName="time" oraxdb:SQLType="NUMBER" oraxdb:memType="2" oraxdb:defaultTable="time745_TAB" oraxdb:defaultTableSchema="MYUSER"/>
  <xs:element name="reservationType" type="xs:string" oraxdb:propNumber="3799" oraxdb:global="true" oraxdb:SQLName="reservationType" oraxdb:SQLType="VARCHAR2" oraxdb:memType="1" oraxdb:defaultTable="reservationType744_TAB" oraxdb:defaultTableSchema="MYUSER"/>
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    6 actions for XMLTYPE PATH 'action '.

    (7) T1,

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    NUMBER of ACTION_SUB_ID 10 PATH "actionSubId."

    11 PATH of VARCHAR2 (4000) ACTION_TYPE "type."

    12 WAY of NUMBER ACTION_TIMESTAMP 'time '.

    (13) T2

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    15 AND ACTION_SUB_ID IS NOT NULL

    16;

    Execution plan

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

    Hash value of plan: 1763884463

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

    | ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |

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

    |   0 | SELECT STATEMENT |                 |   109.   220K |     6 (17). 00:00:01 |

    |   1.  THE MERGE JOIN.                 |   109.   220K |     6 (17). 00:00:01 |

    |*  2 |   TABLE ACCESS BY INDEX ROWID | TEST_TABLE |    11.   352.     2 (0) | 00:00:01 |

    |   3.    INDEX SCAN FULL | SYS_C007567 |    11.       |     1 (0) | 00:00:01 |

    |*  4 |   JOIN TYPE.                 |   109.   216K |     4 (25) | 00:00:01 |

    |*  5 |    TABLE ACCESS FULL | T_OR_MON_ACTION |   106 S 216K |     3 (0) | 00:00:01 |

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

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

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    -----

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    SQL >
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    --------------------------------------------------------------------------


    |   0 | SELECT STATEMENT |      |     4.  8076 |   103 (1) | 00:00:02 |
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    5, varchar2 (1) sex
    6, email_id varchar2 (2000)
    7  );

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    SQL > insert into t
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    ----------------------------------------------------------
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    |*  1 |  TABLE ACCESS FULL | T    |     3.  6057.    79 (4) | 00:00:01 |
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    Note
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    ----------------------------------------------------------
    Hash value of plan: 2655860347

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    |   1.  TABLE ACCESS BY INDEX ROWID | T                  |     1.    44.     1 (0) | 00:00:01 |
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    SQL >

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    1 line of creation.

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

    MY_INDEX

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    2 selected lines.

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

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    DR.$ MY_INDEX$ N

    DR.$ MY_INDEX$ K

    4 selected lines.

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    Post edited by: BarbaraBoehmer (corrected for error due to the already existing preference)

  • Get the error when creating indexes in RAC environment in 11 g

    Hi all

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    Dear Sirs,

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    =========================
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    Dear nobody without a name...

    It looks like the cross-schema issues for me.

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    Sorry, who is?

    In addition, when you select in the metadata table it tells you that the table of the BUILDING is in the SYS schema (SYS is the owner), but not in HHLT or ELKORDY!

    I think that:

    ALTER session set current_schema = HHLT;

    Do not connect you expect - you are still the user SYS - so that when you did:

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 VALUES ('BUILDING', 'BUILDING_POLYGON',
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 SDO_DIM_ELEMENT('Y', 0, 580, 0.005)), NULL);

    It combined the metadata with the SYS owner and not the owner of HHLT where the error during the creation of the index.

    I would recommend you.

    1. connect as the SYS schema.
    2. remove metadata objects.
    3. plug into a new session on the schema HHLT as user HHLT.
    5. create a new metadata entry in user_sdo_geom_metadata when in the HHLT schema.
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    concerning
    SImon

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