Using the external table error

Hi all

This is the first time I use the external table for loading the data.

I did these steps

In the D:\sqlloade folder, I have my text file containing data example.txt

I ran these queries

CREATE OR REPLACE DIRECTORY  ext_tab_data AS 'D:\sqlloader';

Directory created

CREATE TABLE fxops.t_ext (
t number
)
ORGANIZATION EXTERNAL (
  TYPE ORACLE_LOADER
  DEFAULT DIRECTORY ext_tab_data
  ACCESS PARAMETERS (
    RECORDS DELIMITED BY NEWLINE
    FIELDS TERMINATED BY ','
    MISSING FIELD VALUES ARE NULL
    (
     t number
    )
  )
  LOCATION ('sample.txt')
)
PARALLEL 5
REJECT LIMIT UNLIMITED;

create table

When I tried to create a view on that table, he throws an error

CREATE OR REPLACE VIEW fxops.t_view  AS
  SELECT *
  FROM   fxops.t_ext;

SQL Error: ORA-06564: object EXT_TAB_DATA does not exist
06564. 00000 -  "object %s does not exist"
*Cause:    The named object could not be found.  Either it does not exist
           or you do not have permission to access it.
*Action:   Create the object or get permission to access it.

Sign in, and then run this:

Select HOST_NAME from v$ instance;

is this the same hostname that you are connected?

Kind regards

Harry

Tags: Database

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    CHARACTERSET 20 WE8MSWIN1252

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    22 LOAD WHEN)

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    47         )

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    10 "ADJUSTMENT_SIGN."

    11 "QUANTITY ADJUSTMENT."

    12 'ADJ_QTY_DECIMAL_VALUE '.

    13 FROM external_table

    14 WHERE the LENGTH (total_characters) = 87

    15.

    Created view.

    Scott@orcl12c > SELECT * FROM xtb_invadj_from_pos

    2.

    TRANSACTIONDAT LO LOCA ITE ITEM_VALUE UPC_S IN AD AN ADJ_ ADJUSTME

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

    20100127181611 ST 6009 SKU 75001056 00 23 - 00000040 0087

    1 selected line.

  • The external Table storage

    Since data is stored outdoors, and the definition that is stored inside, it means that a the table structure of the outer table is stored in the database as well (or a virtual table based on the definition of the external table...)

    I'll hit the ORA-DOCS again once, back in the external tables read tonight on them 2 or 3 sources and it is not quite clear whether real data with structure exists outside the database or an internal table set (and stored) retrieves data from an outside source.

    Since data is stored outdoors, and the definition that is stored inside, it means that a the table structure of the outer table is stored in the database as well (or a virtual table based on the definition of the external table...)

    The 'definition' you refer to IS the structure of the table; they are one and the same. There is no 'table' stored in the database using space or storage. When a query on an external table is executed, the data source is read.

    
I'll be hitting the ORA-DOCS up again, just got back into external tables tonight reading up on them from 2-3 sources and it is not quite clear if an actual data with structure exists out of the database , or an internally defined (and stored?) table draws data from an outside source.

    I suggest you that start with the documentation of Oracle - including the ground provided the link to:

    If any "metadata" are stored outside the database depends on if the file that is outside of the database was produced by Oracle using the robot UNLOADING discussed in this doc

    Unloading of data using ORACLE_DATAPUMP Access driver

    To unload data, you use the ORACLE_DATAPUMP driver access. The stream that is discharged is in a proprietary format and contains all of the data column for each row being unloaded.

    A discharge operation also creates a stream of metadata that describes the content of the data stream. The information in the metadata stream are required to load the stream. Therefore, the metadata stream is written to the file data and placed before the data stream.

    If YOU provide data/files, then you MUST provide it in the format expected by the external table statement. You can, if you wish, use a preprocessor to convert ANY file (zip, encrypted, etc.) in the required format.

    For YOUR files, you can the metadata stored in the same file, or elsewhere, if you choose, but Oracle will have NO knowledge of this fact and not will NOT be involved in the transformation or read any of the metadata that you provide. Your preprocessor must remove all these metadata and ONLY provide data in the format appropriate for Oracle to use.

    If the file was produced by the process of UNLOADING Oracle then it will include metadata that Oracle WILL read, use, and remove as says this quote from doc above. These external metadata is added to the real external table definintion/metadata stored in the dictionary.

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