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External tables were first introduced in Oracle9i Release 1 Put simply, they allow us to treat an operating system file as if it is a read-only database table They are not intended to be a replacement for a real table, or to be used in place of a real table; rather, they are intended to be used as a tool to ease the loading and, in Oracle 10g, unloading of data When the external tables feature was first unveiled, I often referred to it as the replacement for SQLLDR This idea still holds true most of the time Having said this, you might wonder why we just spent so much time looking at SQLLDR The reason is that SQLLDR has been around for a long time, and there are many, many legacy control files lying around.

Execute the GET_REPORT function to view a text report of a completed ADDM task, as shown here: SET LONG 1000000 PAGESIZE 0; SELECT DBMS_ADDM.GET_REPORT(:tname) FROM DUAL;

If your I/O system performs at a certain speed, your system can read a database block in a specific number of milliseconds; the DBIO_EXPECTED parameter (which is not an initialization parameter) indicates I/O performance, and the default value for this parameter is 10 milliseconds. You can find out the current value of the DBIO_EXPECTED parameter by querying the DBA_ADVISOR_ DEF_PARAMETERS view as follows: SQL> SELECT parameter_value FROM dba_advisor_def_parameters WHERE advisor_name='ADDM' AND parameter_name='DBIO_EXPECTED'; PARAMETER_VALUE --------------10000 SQL> You can use the SET_DEFAULT_TASK_PARAMETER procedure of the DBMS_ADVISOR package to modify the default value of the DBIO_EXPECTED parameter, as shown here: SQL> SHO USER USER is "SYS" SQL> EXECUTE DBMS_ADVISOR.SET_DEFAULT_TASK_PARAMETER(> 'ADDM', 'DBIO_EXPECTED', 6000); PL/SQL procedure successfully completed. SQL>

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The user who performs this operation needs to have the CREATE ANY DIRECTORY privilege. The reason we create two directories is to demonstrate a common case-related ( case as in uppercase versus lowercase characters) issue with regard to DIRECTORY objects. When Oracle created the first directory DIR1, it stored the object name in uppercase as it is the default. In the second example with dir2, it will have created the DIRECTORY object preserving the case we used in the name. The importance of this will be demonstrated shortly when we use the BFILE object. Now, we want to load some data into either a BLOB or a CLOB. The method for doing so is rather easy, for example:

SQLLDR is still a commonly used tool; it is what many people know and have used We are still in a period of transition from the use of SQLLDR to external tables, so SQLLDR is still very relevant What many DBAs don t realize is that their knowledge of SQLLDR control files is very readily transferable to the use of external tables You ll discover, as we work through the examples in this part of the chapter, that external tables incorporate much of the SQLLDR syntax and many of the SQLLDR techniques SQLLDR should be chosen over external tables in the following three situations: You have to load data over a network in other words, when the input file is not on the database server itself One of the restrictions of external tables is that the input file must be accessible on the database server.

The Oracle background process MMON schedules the ADDM to run every time the AWR collects its most recent snapshot. Oracle, therefore, automatically generates ADDM reports throughout the day, which you can view through the Database Control. One of the reasons for invoking the ADDM manually is because an alert might recommend you do it. You can perform an ad hoc ADDM analysis to find out details about a performance problem that s currently occurring in the database. You can create a new AWR snapshot manually and run the ADDM using this and the preceding snapshot. You can also request that the ADDM analyze past instance performance by examining AWR snapshot data that falls between any two nonadjacent snapshots. The only requirements regarding the selection of the AWR snapshots are these: The snapshots must not contain any errors. There can t be a database shutdown between the two snapshots. The AWR holds only cumulative database statistics, and once you shut down the database, all the cumulative data will lose its meaning.

ops$tkyte@ORA11GR2> create table demo 2 ( id int primary key, 3 theClob clob 4 ) 5 / Table created ops$tkyte@ORA11GR2> host echo 'Hello World!' > /tmp/testtxt ops$tkyte@ORA11GR2> declare 2 l_clob clob; 3 l_bfile bfile; 4 begin 5 insert into demo values ( 1, empty_clob() ) 6 returning theclob into l_clob; 7 8 l_bfile := bfilename( 'DIR1', 'testtxt' ); 9 dbms_lobfileopen( l_bfile ); 10 11 dbms_lobloadfromfile( l_clob, l_bfile, 12 dbms_lobgetlength( l_bfile ) ); 13 14 dbms_lobfileclose( l_bfile ); 15 end; 16 / PL/SQL procedure successfully completed ops$tkyte@ORA11GR2> select dbms_lobgetlength(theClob), theClob from demo 2 / DBMS_LOBGETLENGTH(THECLOB) THECLOB --------------------------- --------------13 Hello World! Walking through the preceding code we see: On lines 5 and 6, we create a row in our table, set the CLOB to an EMPTY_CLOB(), and retrieve its value in one call.

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