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Listing 13-3 shows how to create an external table. Listing 13-3. Creating an External Table SQL> CREATE TABLE sales_ext( 2 product_id NUMBER(6), 3 sale_date DATE, 4 store_id NUMBER(8), 5 quantity_sold NUMBER(8), 6 unit_cost NUMBER(10,2), 7 unit_price NUMBER(10,2)) 8 ORGANIZATION EXTERNAL ( 9 TYPE ORACLE_LOADER 10 DEFAULT DIRECTORY ext_data_dir 11 ACCESS PARAMETERS 12 (RECORDS DELIMITED BY NEWLINE 13 BADFILE log_file_dir:'sales.bad_xt' 14 LOGFILE log_file_dir:'sales.log_xt' 15 FIELDS TERMINATED BY "|" LDRTRIM 16 MISSING FIELD VALUES ARE NULL) 17 LOCATION ('sales.data')) 18* REJECT LIMIT UNLIMITED; Table created. SQL> Let s analyze this statement in detail, in order to understand the various components of an external table.

It would appear to anyone else that had read the DEPTNO=20 row that it had been modified, even though it was not. The rows on block 20973 are safe we didn t modify them, so they did not advance. However, if we were to update either of them, both would advance. So the question becomes how to modify this default behavior. Well, unfortunately, we have to re-create the segment with ROWDEPENDENCIES enabled. Row dependency tracking was added to the database with Oracle9i in support of advanced replication to allow for better parallel propagation of changes. Prior to Oracle 10g, its only use was in a replication environment, but starting in Oracle 10g we can use it to implement an effective optimistic locking technique with ORA_ROWSCN. It will add 6 bytes of overhead to each row (so it is not a space saver compared to the do-it-yourself version column) and that is, in fact, why it requires a table re-create and not just a simple ALTER TABLE: the physical block structure must be changed to accommodate this feature. Let s rebuild our table to enable ROWDEPENDENCIES. We could use the online rebuild capabilities in DBMS_REDEFINITION (another supplied package) to do this, but for something so small, we ll just start over:

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The syntax for declaring columns of this type in a table is very straightforward: BINARY_FLOAT BINARY_DOUBLE That is it. There are no options to these types whatsoever.

The statement CREATE TABLE sales_ext (. . .) describes the external table structure, with the ORGANIZATION EXTERNAL clause that follows it indicating that this isn t going to be a regular Oracle table, but an external table. The CREATE statement for an external table is very similar to that of a regular table, except that in addition to the column definitions, you must provide the mapping for the columns to the data fields in the external datafile. In addition, the external table creation statement must provide the operating system location of the external datafile.

The ACCESS PARAMETERS clause, somewhat similar to the OPTIONS clause in a SQL*Loader control file, indicates the various options chosen, as well as the location of the bad file and log file. Several external table parameters are available to specify the format of the data. Important among them are the following: RECORD_FORMAT_INFO: This is an optional clause. The default is RECORDS DELIMITED BY NEWLINE. FIXED: When you specify a fixed length by using the FIXED clause, you re indicating that all records in the external file are of the same length. ACCESS PARAMETERS (RECORD FIXED 20 FIELDS (. . .)) VARIABLE: The VARIABLE clause indicates that each record may be a different size, indicated by a number of digits before the beginning of each record. ACCESS PARAMETERS (RECORDS VARIABLE 2)

ops$tkyte@ORA10G> drop table dept; Table dropped. ops$tkyte@ORA10G> create table dept 2 (deptno, dname, loc, data, 3 constraint dept_pk primary key(deptno) 4 ) 5 ROWDEPENDENCIES 6 as 7 select deptno, dname, loc, rpad('*',3500,'*') 8 from scott.dept; Table created. ops$tkyte@ORA10G> select deptno, dname, 2 dbms_rowid.rowid_block_number(rowid) blockno, 3 ora_rowscn 4 from dept; DEPTNO ---------10 20 30 40 DNAME BLOCKNO ORA_ROWSCN -------------- ---------- ---------ACCOUNTING 21020 34676364 RESEARCH 21020 34676364 SALES 21021 34676364 OPERATIONS 21021 34676364

In addition to the NUMBER, BINARY_FLOAT, and BINARY_DOUBLE types, Oracle syntactically supports the following numeric datatypes:

When you use the VARIABLE clause, every record in this data set will have the following format, with the first two bytes indicating the length of the record: 22samalapati1999dallastx DELIMITED BY: This clause indicates the character that terminates each record. The most common delimiters are the pipe (|) and the comma (,). LOAD WHEN: This clause indicates the conditions that must be satisfied before a record can be loaded into a table. LOAD WHEN (job != MANAGER) LOG FILE, BAD FILE, and DISCARD FILE: These are optional parameters, but a log file is always created by default. The bad file and the discard file are created only if data is rejected or data fails to meet a LOAD WHEN condition. Condition: This variable compares all or part of a field against an arbitrarily chosen constant string.

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