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Writing to an External Table
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The feature shown in Listing 13-6 writing to an external table is an Oracle Database 10g external tables enhancement. Listing 13-6. Populating an External Table SQL> CREATE TABLE test_xt ORGANIZATION EXTERNAL( TYPE ORACLE_DATAPUMP DEFAULT DIRECTORY ext_data_dir LOCATION ('test_xt.dmp')) AS SELECT * FROM scott.dept; Note how the external table creation statement uses the SELECT * FROM . . . clause to write data from the scott.dept table to the external table (file). If your new external table contains some but not all of the columns of the table scott.dept, you use the appropriate SELECT statement instead of the SELECT * FROM statement.
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Remember that when you load an Oracle table from an external table (data loading), you use the INSERT INTO . . . SELECT clause. When you populate an external table using Oracle table data (data unloading), you use the CREATE TABLE . . . AS SELECT clause.
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CHAPTER 13 LOADING AND TRANSFORMING DATA
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If you now go look in the location specified for the default directory (ext_data_dir), you ll see the following: SQL> ls -altr Total 24 drwxr-xr-x -rw-r--r--rw-r-------
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.. TEST_XT_28637.log test_xt.dmp
The first file, test_xt_28637.log, logs the creation of this external table. The dump file test_xt.dmp contains the data from the table. You are creating the external table test_xt as an external table. The table structure and data both come from the regular Oracle table scott.dept. If you wish, you can then use this dump file in the same database or a different database to load other tables. Note that you must create the default directory (ext_data_dir) beforehand for this external table creation statement to succeed. The CTAS method of table creation will load the data from the scott.dept table into the new external table dept_xt. The CTAS command simply stores the table data in the external file called dept_xt_dmp. Thus, the external table is really composed of proprietary format, operating system independent flat files. You can also use the ORACLE_DATAPUMP access loader to extract Oracle table data into multiple files, as shown here: SQL> CREATE TABLE extract_cust ORGANIZATION EXTERNAL (TYPE ORACLE_DATAPUMP DEFAULT DIRECTORY ext_data_dir ACCESS PARAMETERS (NOBADFILE NOLOGFILE) LOCATION ('extract_cust1.exp', 'extract_cust2.exp', 'extract_cust3.exp', 'extract_cust4.exp')) PARALLEL 4 REJECT LIMIT UNLIMITED AS SELECT c.*, co.country_name, co.country_subregion, co.country_region FROM customers c, countries co where co.country_id=c.country_id; The PARALLEL parameter will speed up the data unloading to the four data files. Note that the number of files you specify sets a limit on the degree of parallelization. For example, if you specify PARALLEL=8 and specify only four files, the degree of parallelism would be four, not eight.
Using an External Table
Once you create a new external table by populating an external file with data from an Oracle table, you can query the new table as you would any normal Oracle table. For example, the external table you created, test_xt, would show you the same data as a query on the original table (scott.dept). Here s the query: SQL> SELECT * FROM test_xt; The user samalapati is listed as the owner for this new table test_xt, as shown here: SQL> SELECT owner FROM dba_tables WHERE table_name='TEST_XT'; OWNER ----------SAMALAPATI Note that as in the case of the original external tables in Oracle9i, you can only select from an external table. You also cannot insert, delete, or update data in an external table. Therefore, the term writable external tables applies in only a limited sense you can write to the external tables only when you initially create them. Otherwise, external tables in Oracle Database 10g continue to be read-only tables, as in Oracle9i. Here is an example of what would happen if you attempted to insert
CHAPTER 13 LOADING AND TRANSFORMING DATA
SQL> INSERT INTO test_xt (product_id) VALUES (222222); INSERT INTO test_xt * ERROR at line 1: ORA-30657: operation not supported on external organized table SQL> You would get similar error messages if you tried a DELETE or UPDATE operation. Also note that when you use the external tables feature to extract table data to a file, you export only the data. You can t export metadata using external tables. If you wish to extract the metadata for any object, just use DBMS_METADATA, as shown here: SET LONG 2000 SELECT DBMS_METADATA.GET_DDL('TABLE','EXTRACT_CUST') FROM DUAL;
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