Be Warned: cmclean.sql Is Dangerous!
I’m sure one of the most popular scripts for Apps DBAs on My Oracle Support is cmclean.sql from MOS Article ID 134007.1 “Concurrent Processing – CMCLEAN.SQL – Non Destructive Script to Clean Concurrent...
View ArticleThere’s Always Another Bug Hiding Just Around the Corner
We were using a 10.2.0.3 database, and it had been running without any issues for several years. What could possibly go wrong? Anything! Suddenly, we started getting “ORA-07445: exception encountered:...
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Mining the AWR to Identify Performance Trends
Sometimes it’s useful to check how performance of a SQL statement changes over time. The diagnostic pack features provide some really useful information to answer these questions. The data is there,...
View ArticleMeaning of “Disk Reads” Values in DBA_HIST_SQLSTAT
This post relates to my previous writing on mining the AWR. I noticed that it’s very easy to misinterpret the DISK_READS_TOTAL and DISK_READS_DELTA columns in DBA_HIST_SQLSTAT. Let’s see what the...
View ArticlegetMOSPatch.sh – Downloading Patches From My Oracle Support
How to download patches from My Oracle Support (MOS) directly to the server? This has bothered me since the ftp access was closed a few years ago. Of course, I’ve been given some options by Oracle,...
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My Experience at UKOUG Tech13
UKOUG Tech13 was great! Not only because of the amount of interesting presentations to choose from, but also because of the surrounding events. I felt this conference was quite different from previous...
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Do AWR Reports Show the Whole Picture?
AWR report is a great source of aggregated information on top activities happening in our databases. I use data collected in AWR quite often, and obviously the easiest way of getting the data out from...
View ArticleUsing the ILOM for Troubleshooting on ODA
I worked on root cause analysis for a strange node reboot on client’s Oracle Database Appliance yesterday. The case was quite interesting from the perspective that none of the logs contained any...
View ArticleAre you Ready for the Leap Second?
If you’re not aware of what the leap second is look into it. The fact is, this year the last minute of June 30th will be one second longer and “June 30, 2015 23:59:60” will be a valid and correct time....
View ArticleHandling the Leap Second – Linux
Last week I published a blog post titled “Are You Ready For the Leap Second?“, and by looking at the blog statistics I could tell that many of you read it, and that’s good, because you became aware of...
View ArticleIs Oracle Smart Flash Cache a “SPOF”?
Oracle Smart Flash Cache (OSFC) is a nice feature that was introduced in Oracle 11g Release 2. As only recently I had a real use case for it, I looked into it with the main goal of determining if...
View ArticleInternals of Querying the Concurrent Requests’ Queue – Revisited for R12.2
Once upon a time I wrote about the Internal Workflow of an E-Business Suite Concurrent Manager Process. Many things have changed since that blog post, the most obvious change being the release of...
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The getMOSPatch V2 Is Here!
A while ago I created a Bash script called getMOSPatch.sh. It’s purpose was to allow downloading Oracle patches directly from My Oracle Support to your server without having to visit the support site...
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Investigating IO Performance on Amazon RDS for Oracle
I’ve recently been involved in quite a few database migrations to Oracle RDS. One thing that I had noticed when dealing with post-migration performance issues was related to queries that used TABLE...
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Investigating IO performance on Amazon EC2
I published a blog post called “Investigating IO Performance on Amazon RDS for Oracle” recently, and soon after posting it I received several questions asking if IO worked the same way on EC2...
View ArticleAutomating Password Rotation for Oracle Databases
Password rotation is not the most exciting task in the world, and that’s exactly why it’s a perfect candidate for automation. Automating routine tasks like this are good for everyone – DBAs can work on...
View ArticleInternals of querying the concurrent requests’ queue – revisited for R12.2
Once upon a time I wrote about the Internal Workflow of an E-Business Suite Concurrent Manager Process. Many things have changed since that blog post, the most obvious change being the release of...
View ArticleClik here to view.
The getMOSPatch V2 is here!
A while ago I created a Bash script called getMOSPatch.sh. It’s purpose was to allow downloading Oracle patches directly from My Oracle Support to your server without having to visit the support site...
View ArticleClik here to view.
Investigating IO performance on Amazon RDS for Oracle
I’ve recently been involved in quite a few database migrations to Oracle RDS. One thing that I had noticed when dealing with post-migration performance issues was related to queries that used TABLE...
View ArticleClik here to view.
Investigating IO performance on Amazon EC2
I published a blog post called “Investigating IO Performance on Amazon RDS for Oracle” recently, and soon after posting it I received several questions asking if IO worked the same way on EC2...
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