A rather not so great post about an ORA-00600 error i faced on a standby database. Environement was 188.8.131.52 on Sun Super Cluster machine. MRP process was hitting ORA-00600 while trying to apply a specific archive log.
The error message was something like this
MRP0: Background Media Recovery terminated with error 600
Errors in file /u01/app/oracle/product/184.108.40.206/diag/diag/rdbms/xxxprd/xxxprd1/trace/xxxprd1_pr00_6342.trc:
ORA-00600: internal error code, arguments: , , , , , , , (more...)
One of the articles I wrote for redgate’s AllthingsOracle site some time ago included a listing of the data distribution for some client data which I had camouflaged. A recent comment on the article asked how I had generated the data – of course the answer was that I hadn’t generated it, but I had done something to take advantage of its existence without revealing the actual values. This article is just a little (more...)
What prompted me to write my previous note about subquerying was an upgrade to 12c, and a check that a few critical queries would not do something nasty on the upgrade. As ever it’s always interesting how many little oddities you can discover while looking closely as some little detail of how the optimizer works. Here’s an oddity that came up in the course of my
playing around investigation in 220.127.116.11 – (more...)
I never thought I would have to optimize so simple query as
select col1, col2, col4, col7 from table where rownum=1
(even though I read recently “SELECT * FROM TABLE” Runs Out Of TEMP Space)
But a few days ago frequent executions of this query caused big problems on the one of our databases(18.104.22.168) because of adaptive serial direct path reads.
I don’t know why, but I felt intuitively that full (more...)
A new version 4.21 of the XPLAN_ASH utility is available for download. I publish this version because it will be used in the recent video tutorials explaining the Active Session History functionality of the script.As usual the latest version can be downloaded here.
This is mainly a maintenance release that fixes some incompatibilities of the 4.2 version with less recent versions (10.2 and 22.214.171.124).
As an extra however, (more...)
Few days ago I experienced strange issue in my development environment running on OEL 5.8 with EXT4 filesystem. Note - EXT4 filesystem is supported from OEL 5.6 version.
This was virtual machine running oldish 10.2.0.5.0 Oracle database.
I noticed that backup for my database is failing because of archive log corruption. As this is development database I've simply deleted corrupted archive logs and initiated full backup again. But backup (more...)
First things first: Thou shalt not explicitly set AQ_TM_PROCESSES=0 ! Unless, of course, you want to disable the Queue Manager Process (QMNC in Oracle 11.x). Which you may want to do during database upgrades to prevent Streams or Advanced Queueing from interfering with the upgrade process. However, if you don’t reset this parameter afterwards, you might run […]
Just the other day I hit the unpublished Bug 16445132: DBMS_SCHEDULER PROBLEM WITH DATABASE MIGRATION VIA EXPDP/IMPDP. It affects Scheduler Jobs that were created to end with a corresponding Scheduler Window. Here’s an excerpt of a Data Pump Logfile: ORA-39083: Object type PROCOBJ failed to create with error: ORA-27469: STOP_ON_WINDOW_EXIT is not a valid job […]
One of the great things about working in IT is that you can often win an argument simply by being right. Not because of who you are or because you are more eloquent than others, but because the facts support your position. Almost every IT person I have ever met respects facts.
In order to win arguments this way, you of course need some facts to work with. And that’s where too many people fail. (more...)
I wanted to install Oracle JDevelper 12.1.3 – a version that I had been eagerly awaiting. Since my primary machine is a MacBook, I wanted to install it on OS X 10.9.3.
I downloaded the generic installer and found that the install didn’t run. Since OS X had disappeared from the documentation, I assumed that I would have to fiddle around until I found a combination of JDK and OS (more...)
I noticed something for the first time tonight when I was playing around in the Enkitec lab – something that I have been doing wrong for a while. When working in the lab, I often rely on the crsctl command to shut down the entire cluster stack for me. It’s really easy to use “crsctl stop cluster -all” followed by “dcli -l root -g ~/dbs_group /u01/app/126.96.36.199/grid/bin/crsctl stop crs” to get everything down (more...)
We had a client that was running into a strange issue on their Exadata where new connections coming in through the SCAN were failing. After doing some troubleshooting, it was discovered that it was related to one of the SCAN listeners not properly accepting requests from new sessions. The VIP and listener were running, and everything looked normal.
We had the following SCAN setup:
Last week I’ve mentioned on Twitter
that we ran into wrong result bug
. We found workaround quickly but I’ve decided to spend some time to reproduce error and write blog post to warn you about this optimizer behavior.
Special thanks to my colleague who spotted odd results which led us to this finding.
My test (virtual) environment is:
OS: Oracle Enterprise Linux 5.8
DB: Oracle EE 188.8.131.52.12
In test I (more...)
In the Oracle technical universe, it seems that the end of the calendar year is always eventful. First there’s OpenWorld: obviously significant for official announcements and insight into Oracle’s strategy. It’s also the week when many top engineers around the world meet up in San Francisco to catch up over (more...)
We want restore backup from source. So we took backup from source and copied it to /dba/share/MYDB on target. My collouge sent me email saying restore failed with following error
rman target /
Recovery Manager: Release 184.108.40.206.0 - Production on Wed Sep 18 20:47:38 2013
Not too sure what I changed on my laptop, possibly just installation of another product or perhaps Microsoft or similar updates, but when I went to edit a BI Publisher RTF template I got the following error message on clicking ANY button in the BI Publisher plugin for Microsoft Word.
This is a translation of my German article which was requested through “Google Translate” many times. It seems that throughout the years this error and its mostly simple causes haven’t lost their significance. Here’s a sample scenario: A table’s VARCHAR2 column shall be searched for numeric entries; We use a query with a WHERE clause […]
I’ll be co-speaking with Tyler Muth at E4 and we will be talking about Performance Visualization… some of you may already know that I’m really a big fan of Tableau and just to give you an example on what the tool can do I’ve consolidated all the different viz that (more...)
Oracle’s “Security Alert Advisory for CVE-2012-3132” issued a warning about an attack vector that once again was discovered by security expert David Litchfield. The vulnerability allows to execute SQL code with SYS privileges by using object names containing quotation marks, if the attacker has authorized access to the database, has CREATE TABLE and CREATE PROCEDURE privileges […]