Oracle

Troubleshooting ORA-27090 Async I/O Errors with Systemtap

There’s a known bug, 7306820 “ORA-7445 [krhahw] / ORA-27090 during file header read. Instances may crash, but this bug is fixed in 11.2.0.1, and this database is running 11.2.0.3. And on top of that, it’s an Exadata system, so I/O to storage servers goes over the InfiniBand network rather than using async I/O (AIO) calls.

IOUG Collaborate 2013 — Call for Speakers Informational Webinar

As I’ve become Director of Communities for IOUG recently, I’m intimately involved in many aspects of leading the IOUG community. One of the areas the user group is pursuing all the time is finding new speakers, and it takes a lot of convincing before community members actually start presenting. There are many of you who have exciting projects and implementations to share but can’t quite convince themselves to actually present.

Log Buffer #285, A Carnival of the Vanities for DBAs

If the basics are right, then the foundation is more likely to be solid, and the growth on that foundation is almost sure to follow the progressive path. Oracle, SQL Server, and MySQL bloggers are striving hard to set the basics of technology in order to help lay a sound foundation for the readers so that they can grow leaps and bounds in the right direction. This Log Buffer Edition covers just that.

Flashback and Forth

One of the readers of my previous post about Oracle’s Flashback Database, posted a comment noting that the Oracle documentation doesn’t make any reference to the ability of the FLASHBACK DATABASE command to roll the database forward. I knew from experience that the database can be rolled back and forth using the FLASHBACK DATABASE command and decided to have a closer look.

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