ASP.NET Web PDF Document Viewer/Editor Control Library

Here is the syntax of the REGEXP_LIKE function: REGEXP_LIKE(source_string, pattern [,match_parameter]) If you want to carry out string-manipulation tasks, you can use the REGEXP_INSTR, REGEXP_ REPLACE, or REGEXP_SUBSTR built-in functions. These are really extensions of the normal SQL INSTR, REPLACE, and SUBSTR functions. Regular expression features use characters like the period (.), asterisk (*), caret (^), and dollar sign ($), which are common in UNIX and Perl programming. The caret character (^), for example, tells Oracle that the characters following it should be at the beginning of the line. Similarly, the S character indicates that a character or a set of characters must be at the very end of the line. Here s an example using the REGEXP_LIKE function that picks up all names with consecutive vowels: SQL> SELECT last_name FROM employees WHERE REGEXP_LIKE (last_name, '([aeiou])\1', 'i'); LAST_NAME ----------Freedman Greenberg Khoo Gee Lee . . . SQL> Here s another example that quickly searches for employees who were hired between the years 2000 and 2005. SQL> SELECT emp_name, salary, 2 TO_CHAR(hire_date,'yyyy') year_of_hire 3 FROM .emp 4* WHERE REGEXP_LIKE (TO_CHAR (hire_date, 'yyyy'), '^200[0-5]$'); LAST_NAME FIRST_NAME SALARY YEAR ------------------------- -------------------- ---------- ---Austin David 4800 1997 Chen John 8200 1997 Alapati Shannon 7700 1997 Baida Shelli 2900 1997 Tobias Sigal 2800 1997 Weiss Matthew 8000 1996

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VI=/usr/bin/vim-rcs for file in $ALLTHEFILES do # Get some basic info about the file PATH=`$DIRNAME $file` FILENAME=`$BASENAME $file`

To enable the automatic management of your undo space, you first need to specify the automatic undo mode in the init.ora file or your SPFILE. Second, you need to create a dedicated tablespace to hold the undo information. This will guarantee that you don t end up storing the undo information in the System tablespace, which isn t a great idea. You also must choose an interval for undo retention. If you want to choose AUM when you create a new database, you need to configure the following three initialization parameters: UNDO_MANAGEMENT UNDO_TABLESPACE UNDO_RETENTION

You specify AUM in your initialization parameter file by adding the following line: UNDO_MANAGEMENT = auto This is the only mandatory parameter for setting up AUM. When you use the value AUTO for the UNDO_MANAGEMENT initialization parameter, the database will start in the automatic undo management mode. (The default for undo management in Oracle Database 10g is still the manual mode, which is the older method of utilizing rollback segments to store undo data.)

Use the Database Resource Manager to set up undo quotas for users, if you think any users are monopolizing undo tablespace usage.

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The UNDO_TABLESPACE parameter isn t mandatory if you only have a single undo tablespace, you don t have to specify this parameter in your initialization parameter file, because Oracle will use the one available undo tablespace automatically. If you specify AUM and don t have an undo tablespace in your database at all, Oracle will be forced to use the System tablespace (the System rollback segment, to be more specific) for storing the undo data. You should avoid using the System tablespace

Now the script should determine whether the file has already been checked in under the RCS. If it has, we check it out. Then we edit the file as usual.

for storing the undo data, since that tablespace also stores the data dictionary, and you don t want to use up space there and cause problems such as fragmentation. Note that you can t create application tables and indexes in an undo tablespace, since it s exclusively reserved for undo data.

If you use the Database Configuration Assistant (DBCA) to create your databases, or choose the creation of the default database when you install Oracle Database 10g, Oracle will use AUM by default. This is contrary to what happens when you manually create a new database; in that case the default mode for undo management is MANUAL, which means you have to manage undo data using rollback segments.