Oracle 11g ASM Diskgroup Compatibility

Back in April I was at COLLABORATE 08 and delivered a presentation on 11g — Oracle 11g New Features Out of the Box, including Oracle 11g ASM features. The first ASM slide was about diskgroup compatibility, and I have a bit more to share than I said back then.

Oracle Silent Mode, Part 2: Patching 10.2 And 11.1 Databases

This post is the second in a series of ten posts exploring some of the Oracle Universal Installer (OUI), Network Assistant (NETCA), Database Creation Assistant (DBCA), Database Upgrade Assistant (DBUA), and many more syntaxes you can use to script or speed up Oracle Installations. This post is way shorter and digs into a couple OPatch, DBUA, and OUI syntaxes. It explains how to apply a one-off patch, how to upgrade a database and how to uninstall a previous ORACLE_HOME.

MySQL Backup Presentation Online

I finished uploading the backup presentation that I did last Monday at the Boston MySQL User’s Group. I cover the basics of backup/recovery and disaster planning. Total time is about an hour and three minutes. It was a lot of fun and the Bostonians seem to appreciate it.

MySQL plug-in 1.1 for Oracle 10g Grid Control

It’s been a while since the MySQL Management Plug-in 0.42 was released. Since then, I quietly updated it to version 1.0. The changes were very few; the biggest news was that the plug-in was certified by Oracle and added to OTN Oracle 10g Grid Control Extensions Exchange. Version 1.1 turned out to be a major rewrite for the Perl collection scripts and the net result is that compatibility across platforms is greatly improved. I have successfully tested the new version on Linux and Windows Agent hosts. So what’s new in version 1.1 compared to 0.42? Find out here.

Simple MySQL Auditing

Simple auditing can save you tons of time while troubleshooting. I came up with some simple stored procedure that will compare two data sets and keep track of the changes historically. It’s loosely based on slowly-changing dimension type 2 in the data warehouse world. This method tracks only changes, so you should be able to keep historical rows forever, unless you are constantly dropping and creating whatever you are tracking.

Get to Know the 11i Context File Better

From my previous post on TXK rollup patch, you already know the significance of adctxinf.tmp file in $AD_TOP/admin/template directory. It has wealth of information about different XML tags in the Context XML file of an Apps 11i instance. In relation to the same file, now I want to share with you all a small XSL (XML style sheet) file I wrote back in 2005. It makes adctxinf.tmp much more readable; all tags are presented in a tabular format in the browser.


It turns out that there are a few statements that will update the LAST_DDL_TIME without changing the table structure. An item to note is that a prerequisite to FLASHBACK TABLE is to enable row movement on that table, via (you guessed it) an ALTER TABLE statement. The ALTER TABLE foo ENABLE ROW MOVEMENT statement also bumps LAST_DDL_TIME, but obviously doesn’t block FLASHBACK TABLE from going past it in time.
The bottom of all this is that you can’t use LAST_DDL_TIME to determine just how far back you can go with a FLASHBACK TABLE statement, as you can most likely go past it due to various non-structure-changing DDL statements that affect that timestamp. Here’s a little demonstration to illustrate this point

Billy Joel and Databases

So, we have all heard that Billy Joel played a concert at Oracle’s OpenWorld in 2007. What follows is an actual IRC conversation among Don Seiler, Dave Edwards, and myself. Comment here with your own database-themed parody of a Billy Joel song. Perhaps if we get enough MySQL-themed entries, we can get him to come to the MySQL Conference in April.

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