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Note that you can also use the DBMS_PROFILER in a much more intuitive fashion by using the GUI-based TOAD software distributed by Quest Software (http://www.quest.com).
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You use the DBMS_ERRLOG package to create an error-logging table that captures all errors during a DML operation, and enables the operation to continue rather than terminate when it encounters errors. In the following example, I create an error-logging table named ERRLOG_TAB, which holds all the errors that may arise during any DML operations on the table named TEST: SQL> EXECUTE DBMS_ERRLOG.CREATE_ERROR_LOG (dml_table_name => 'TEST',err_log_table_name => 'ERRLOG_TAB',err_log_table_owner => 'HR',err_log_table_space => 'USERS'); PL/SQL procedure successfully completed. SQL> The error-logging table you created using the preceding procedure contains two types of columns: columns showing you the Oracle error number and the error messages, and the original columns of the TEST table, as shown here:
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CHAPTER 24 USING ORACLE PL/SQL PACKAGES
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SQL> DESCRIBE ERRLOG_TAB Name ----------------ORA_ERR_NUMBER$ ORA_ERR_MESG$ ORA_ERR_ROWID$ ORA_ERR_OPTYP$ ORA_ERR_TAG$ PERSON_NAME PERSON_ID PERSON_DEPT SQL>
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Type -------------NUMBER VARCHAR2(2000) ROWID VARCHAR2(2) VARCHAR2(2000) VARCHAR2(4000) VARCHAR2(4000) VARCHAR2(4000)
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The first five columns are mandatory control columns that show the Oracle error information, and the last three columns are the columns of the table being monitored by the error-logging table.
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UTL_FILE
The wonderful UTL_FILE package enables you to write to and read from operating system files easily. The UTL_FILE package provides you with a restricted version of standard operating-system stream file I/O. Listing 24-18 shows you the main procedures and functions in the UTL_FILE package. The procedures let you open, read from, write to, and close the operating system files. Oracle also uses a client-side text I/O package, the TEXT_IO package, as part of the Oracle Procedure Builder. Listing 24-18. Describing the UTL_FILE Package SQL> DESC utl_file Argument Name Type In/Out Default -------------------------------- ----------------------- -----FUNCTION FOPEN RETURNS RECORD /* Opens a file for input/output */ ID BINARY_INTEGER OUT DATATYPE BINARY_INTEGER OUT LOCATION VARCHAR2 IN FILENAME VARCHAR2 IN OPEN_MODE VARCHAR2 IN PROCEDURE FCLOSE /* Closes a file */ FILE RECORD IN/OUT ID BINARY_INTEGER IN/OUT DATATYPE BINARY_INTEGER IN/OUT PROCEDURE FFLUSH /* Writes all pending output to a file */ FILE RECORD IN ID BINARY_INTEGER IN DATATYPE BINARY_INTEGER IN BUFFER VARCHAR2 OUT PROCEDURE NEW_LINE /* Writes an end of line terminator */ FILE RECORD IN ID BINARY_INTEGER IN DATATYPE BINARY_INTEGER IN LINES BINARY_INTEGER IN DEFAULT PROCEDURE PUT
CHAPTER 24 USING ORACLE PL/SQL PACKAGES
/* Writes a line to a file */ FILE RECORD IN ID BINARY_INTEGER IN DATATYPE BINARY_INTEGER IN BUFFER VARCHAR2 IN PROCEDURE PUT_LINE /* Writes a single line to the file, and includes a line terminator */ FILE RECORD IN ID BINARY_INTEGER IN DATATYPE BINARY_INTEGER IN BUFFER VARCHAR2 IN SQL>
Using the UTL_FILE Package
It s easy to use the UTL_FILE package to read from and write to the operating system files. In many cases, when you need to create reports, the UTL_FILE package is ideal for creating the file, which you can then send to external sources using the FTP utility. The following sections take you through a simple example that illustrates the use of this package.
Creating the File Directory
The first step in using the UTL_FILE package is to create the directory where you want to place the operating system files. You need to create a special directory for this purpose, using the following command: SQL> CREATE DIRECTORY utl_dir AS '/u50/oradata/archive_data'; /*the directory could be named anything you want - utl_dir is just an example*/ Directory created. SQL>
The UTL_FILE_DIR initialization parameter is still valid, but Oracle doesn t recommend using it anymore. Tip Oracle recommends that you use the new CREATE DIRECTORY command instead. Using the CREATE DIRECTORY approach is better because you don t have to restart the database (when you want to add the UTL_FILE_DIR parameter).
Granting Privileges to Users
You must grant your users privileges to read and write files in the utl_dir directory that you just created. You can do this by executing the following command: SQL> GRANT READ, WRITE ON DIRECTORY utl_dir to public; Grant succeeded. SQL>
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