Oracle

ORA-01450 During Online Index Rebuild

We hit an ORA-01450 error today trying to do online rebuild for an index in an unusable state. This was a non-unique index on a fairly large column — VARCHAR2(800 CHAR). It rang a bell. I remembered that I encountered this issue a while ago, but I couldn’t recall the details. I know that it has nothing to do with the actual data size — it’s an error that can occur during index creation.

Oracle 11g — Audit Enabled by Default, But What About Purging?

During my presentation at the TOUG meeting, I mentioned that when using 11g’s enhanced security settings or, at least, the audit setting, you risk the unlimited growth of the SYSTEM. Mohamed El-Shafie from Oracle quickly noticed that there is no auto-purge. I promised to have another look at the maintenance tasks in 11g to confirm that, and indeed, the audit trail is not purged automatically when auditing is enabled by default. Here is a quick remedy — scheduling an audit trail maintenance job.

dbWatch News

Seems I have turned into a bit of a news source. dbWatch Software sent me a news release on their dbWatch monitoring platform, which looks like it might be an interesting product for those who work in a heterogeneous database environment. Here’s the release.

Tuning ‘log file sync’ Event Waits

In this blog entry, I will discuss strategies and techniques to resolve ‘log file sync’ waits. This entry is intended to show an approach based upon scientific principles, not necessarily a step-by-step guide. Let’s understand how LGWR is inherent in implementing the commit mechanism first.

How Oracle Follows Good Database Development Standards, NOT

This is what I found in the APEX documentation that comes with Oracle 11g, in the chapter describing building a very simple application…Making sure the database instance couldn’t potentially use an index in DEPARTMENT_ID column? Why on earth would you teach novice APEX developers such a horrible practice? To me, it’s one more confirmation that Oracle can do an excellent RDBMS, but when it comes to database applications development . . .

Alex Gorbachev at the TOUG July 2008 Meeting

Small local user group meetings have their own beauty because of the special intimate atmosphere. We expected somewhat higher attendance but it seems that people were already in the holiday mode. The presentation itself went very well and I liked my pace since I didn’t have any time pressure. I’ve done this presentation before in 45 minutes and this time it took slightly more than an hour but I was able to spend additional time on few more complex topics and explain the underlying concepts making sure we all are on the same page. I also enjoyed the questions during the presentation — always a pleasure to know which parts are more interesting to the audience and questions is one of the best indicators. Another one is when people take notes. All in all — it was a very encouraging hour. Thanks to every one who attended!

Going to Toronto Oracle User Group Meeting (June 2008)

Today I’m doing a presentation at the Toronto Oracle User Group meeting. It’ll be my first time there and I’m really looking forward to it. My session is called Oracle 11g New Features Out of the Box. It went pretty well at Collaborate 08 and I think it will be the right audience at the TOUG meeting.

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