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Database Feed

Oracle Database, Oracle 10g, Oracle 11g, Oracle XE, Oracle RAC, Oracle Instant Client, Oracle Data Guard and Oracle Exadata resources, news, and support articles.

ASM normal redundancy and failure groups spanning SANs

Julian Dyke has started an interesting thread on the Oak Table mailing list after the latest UKOUG RAC and HA SIG. Unfortunately I couldn’t attend that event, I wish I had, and I knew it would be great.

Manual Standby Database Under Standard Edition

Oracle's Standby technology has been rebranded as DataGuard in recent versions of Oracle. Oracle has added a layer of technology automation on top of the standby technology, making automatic Standby technology seamless. But what about the folks on Standard Edition Oracle? Are they left out in the cold?

Well, it turns out that it is still possible to create a *manual* standby database on Oracle SE. Here's how you do it.

Errors when installing “Guest Additions” using Oracle VM Virtual Box & Oracle Enterprise Linux

After upgrading Oracle VM VirtualBox from 3.x to 4.0.4, I created a new virtual machine and installed Oracle Enterprise Linux 5.2 (64-bit). While installing “Guest Additions” on the guest OS, I received the following error message:


Building the VirtualBox Guest Additions kernel modules

The headers for the current running kernel were not found. If the following module compilation fails then this could be the reason.

The missing package can be probably installed with

Cron during British Summer Time / Daylight Saving Time

For older versions of unix/linux, crons running at 01.* (anything from 01:00 to 01:59) do not run during the Spring Sunday time change. Those sames crons will run twice during the Autumn time change. So it is important to not … Continue reading

OraSRP 4.1.0

First time I've read about LOBREAD lines in 10046 traces in Vladimir Begun's blog-post dated Jun 2, 2010. I've tried to reproduce such trace in my environment but failed. Since Vladimir is Oracle employee, I've decided that his example was from some yet-unreleased version of database.

...And I successfully forgot to re-check it even when was released.

PX Deq Credit: send blkd Tuning

Parallelism is near to silver bullet for many of the database operation on huge volume of data. But as is the case with bullets, you have to handle them with care otherwise they could backfire.

ops_SIMD 0.3

Here is my third version of (so far) known fastest Oracle RDBMS hash cracker (DES based hashes):

ops_SIMD 0.3

Here is my third version of (so far) known fastest Oracle RDBMS hash cracker (DES based hashes):


This is a quick note on the importance of ORDER BY for the order of the result set produced by a SELECT. The mantra is very simple:

Without an order_by_clause, no guarantee exists that the same query executed more than once will retrieve rows in the same order.

We don’t call it COLLABORATE for nothing

When is the last time you consulted with one of your colleagues to solve a technical dilemma … let me stop for a second … not in the last 13 minutes :) collaborate: –verb (used without object), -rat·ed, -rat·ing. to work, one with another; cooperate, as on a literary work: They collaborated on a novel [...]

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