ASP.NET Web PDF Document Viewer/Editor Control Library

You can enable the automatic growth of the undo tablespace by using the AUTOEXTEND keyword when you create a new undo tablespace, as shown here: SQL> CREATE UNDO TABLESPACE undotbs_01 DATAFILE '/u10/oradata/prod/undo0101dbf' SIZE 100M AUTOEXTEND ON; If you ve already created the undo tablespace, you can make it auto-extensible by simply adding an auto-extensible data file to the undo tablespace, as shown here: SQL> ALTER TABLESPACE undotbs_01 ADD DATAFILE '/u01/oradata/prod/undo0102dbf' AUTOEXTEND ON NEXT 5M MAXSIZE UNLIMITED; If, for some reason, you decide that you have to create a fixed-size undo tablespace, you can use the Undo Advisor to get recommendations about the ideal size.

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#!/bin/sh def_colors () { # Attributes normal='\033[0m'; bold='\033[1m'; dim='\033[2m'; under='\033[4m' italic='\033[3m'; noitalic='\033[23m'; blink='\033[5m'; reverse='\033[7m'; conceal='\033[8m' nobold='\033[22m'; nounder='\033[24m'; noblink='\033[25m' # Foreground black='\033[30m'; red='\033[31m'; green='\033[32m'; yellow='\033[33m' blue='\033[34m'; magenta='\033[35m'; cyan='\033[36m'; white='\033[37m' # Background bblack='\033[40m'; bred='\033[41m' bgreen='\033[42m'; byellow='\033[43m' bblue='\033[44m'; bmagenta='\033[45m' bcyan='\033[46m'; bwhite='\033[47m' } def_colors

The Undo Advisor uses the data collected by the Automatic Workload Repository (AWR) as the basis for its analysis, so you should let the instance run for a good while after you start it, so that the Undo Advisor has enough data to figure out its recommendations The Undo Advisor takes two inputs the estimated length of the longest query in the database, and how far you want to go back in time for your Flashback operations that depend on undo data Using the larger of these as a guide, you can look up the ideal size for your undo tablespace on an Undo Advisor graph I explain how to use the Undo Advisor later in this chapter, in the Using the OEM to Manage Undo Data section..

Sometimes when you start an instance or switch an undo tablespace, it takes several minutes for the undo segments to come online. To avoid this problem, Oracle Database 10g uses the data in the Automatic Workload Repository to determine the number of undo segments to bring online upon an instance restart or the switching of an undo tablespace. This feature is also known as the fast ramping up of undo segments.

When a transaction commits, the undo data for that transaction isn t needed any more. That undo data will stay in the undo tablespace, however, until space is needed to record undo data for newer transactions. When the newer transactions undo data comes in, it may overwrite the old undo data (from the committed transactions) if there isn t enough free space left in the undo tablespace. For a long-running query that needs to retain older undo data for consistency purposes, there is a possibility that some of the undo data it needs has been overwritten by other, newer transactions. In this case, you could get an error message ( snapshot too old ) from the database indicating that the before-image of the transaction has been overwritten. To prevent this, Oracle provides the UNDO_RETENTION configuration parameter, which you can set to the interval you wish. Note that in the older manual undo management mode, DBAs don t have the option of determining how long Oracle retains undo information.

Remember that Oracle Corporation is not the only source of Oracle classes. Although Oracle University is a large entity with fine courses, other private vendors offer courses that are just as good or better than those that Oracle University offers. As is true of all courses, the quality of the teaching depends directly on the teacher s experience and communication skills. And remember that you really don t have to go anywhere to take a class; you can purchase self-study CD-ROMs and learn by yourself, at a fraction (one-fifth) of the cost for the instructorled in-class training. If you re planning to take the Oracle courses, make sure you re also working on a server with an actual database. Oracle supplies very well-designed sample schemas that you can use to sharpen your SQL skills, whether your database is a development version on a UNIX server or a free downloaded Windows version of Oracle Database 10g Enterprise Edition on your desktop computer. You ll go further in a shorter time with this approach.

I did not use all of the colors or attributes defined in the function, but I included them for the sake of completeness. This function would be an excellent addition to a standard library, which is discussed in 2. Now that the colors are defined, the script clears the display and then obtains the name of the machine from the /proc/hostname file. Then it displays a header for the report.