Hello Noida-Are You Attending Oracle Cloud Day….

Are you living and/or working in Noida or any place near to it? Do you happen to work with Oracle technologies especially database and it’s related ones? Are you curious to understand technically about Oracle’s Cloud Computing services? Well, then you must attend,

Oracle Cloud Day 26th March 2016

In a first of it’s kind event happening at Oracle’s Noida office, would be bringing you the information about three different aspects of Oracle’s Cloud services-Oracle (more...)

Client support for WITH using PL/SQL

My employer has been using 12c for about a year now, migrating away from 11gR2. It's fun working out the new functionality, including wider use of PL/SQL.

In the 'old' world, you had SQL statements that had to include PL/SQL, such as CREATE TRIGGER, PROCEDURE etc). And you had statements that could never include PL/SQL, such as CREATE SYNONYM, CREATE SEQUENCE. DML (SELECT, INSERT, UPDATE, DELETE and MERGE) were in the latter category.

One of (more...)

AWR Warehouse – security issue

During implementation of AWR Warehouse, I discovered that AWR warehouse is using temporary staging schemas in the AWR warehouse repository database. These schemas life approximately for the duration of a datapump import job and are then dropped again. Due to the fact that the used password is not compliant with customers password verification function, the jobs failed.


Step by Step Jan 2016 PSU Patch Apply on 12c Grid and RDBMS Homes in Linux

Following step by step action plan is for single instance database stored on ASM in on Linux (OEL 6 64 bit in this case.)

Issues with Oracle Direct NFS

This is a quick post to highlight two issues I had with Oracle dNFS. Both relate to wrong entries in the oranfstab file.

One might encounter ORA-00600 during database creation:

ORA-00600: internal error code, arguments: [KSSRMP1], [], [], [], [], [], [], [], [], [], [], []
ORA-17502: ksfdcre:3 Failed to create file /oracle/ORCL/database/ORCL/controlfile/o1_mf_%u_.ctl

This was caused by having a wrong entry in oranfstab (more...)

Combine WC Portal Assets in one Workspace

Working with WebCenter Portal 12c, you can develop your (Shared) Assets within JDeveloper. After installing the WebCenter updates, you can create an WebCenter Portal Asset Application: 

Choose a more generic application name, in my case RichardWcpAssets:

Now in step two I already know I am going to create a Page Template Asset, so I name the Project RichardPageTemplate and accept the default Project Features:

Accept the default package and location in step three and move (more...)


In Oracle database the vie DBA_FEATURE_USAGE_STATISTICS is given to
display information about database feature usage statistics.
That's all I can find in The (12.1) Docu.

Just in case anyone asks - DBA_FEATURE_USAGE_STATISTICS is not mentioned in the license guide at all:

Still for me it's interesting what's behind the view, and how it's content is populated.

So I started to analyze it's anatomy.
Starting with the view definition (slightly rewritten for better readability):
SELECT  (more...)

OPatch bugs when applying Grid Infrastructure

For one of my clients, I experienced several issues with applying PSU with opatch

There were some code changes in opatchauto, which are not yet production-ready. I am looking forward to seeing a new opatch release (maybe or 11) which has these issues fixed.

    “opatchauto apply -analyze” is (more...)

DOAG 2015: Best of Oracle Security 2015

Yesterday I gave my yearly presentation “Best of Oracle Security 2015” at the DOAG 2015 conference in Nürnberg. In this presentation I showed different Oracle exploits I found/modified released in 2015 in various sources.

One of the most interesting Oracle bugs in 2015 was CVE-2014-6577 (found by Trustwave, affecting,,, 12.1.02, fixed in April 2015 CPU). This bug can be used as helper (more...)

Did it really fix it 1: OFE & nasty FIRST_ROWS plan on

Plan degradations on upgrade are normal.

This one’s no different.

On further investigation, turned out application was setting optimizer_mode = first_rows somewhere.

First point about this is that first_rows really shouldn’t be used either as a hint or as an optimizer_mode.

What does FIRST_ROWS mean?
From 11g doco:

The optimizer uses a mix of costs and heuristics to find a best plan for fast delivery of the first few rows.

If any sort of (more...)

Auto Search in the Enterprise Manager through bookmarks

Since 12c when debugging or looking at flow instances in the Enterprise Manager, we have to use the search button to make the flow instances appear. By default the following text is being displayed: 'Conduct a search to display the list of message flows across SOA composites in the SOA Infrastructure'.

When you open the search bar on the right pane and click search, the instances of the last 24 hours are being displayed:

However, (more...)

OOW15: Oracle Open World 2015

Just before Oracle Open World 2015, the launch of the new 12c (12.2.1) release went public. This release was a full release of the whole stack. From WebLogic Server to Business Intelligence, including product that were not on 12.1.3 yet, like WebCenter. A bit closer to Open World than expected, but this was good news, meaning we can talk freely about 12.2.1 and get all the information on it (more...)

SQL Tuning: Thinking in Sets / How and When to be Bushy

Below is a SQL statement from a performance problem I was looking at the other day.

This is a real-world bit of SQL which has slightly simplified and sanitised but, I hope, without losing the real-worldliness of it and the points driving this article.

You don’t really need to be familiar with the data or table structures (I wasn’t) as this is a commentary on SQL structure and why sometimes a rewrite is the best (more...)

OOW15: Announcing WCP 12.2.1

It has been a long wait, but WebCenter has finally been released on 12c, WebCenter Portal 12.2.1 is out and brings you new features we have been waiting for! Just to name a few:
  • A more/better responsive design
  • a WYSIWYG editor with preview mode
  • Embedded content UI for ECM functionality
  • New Portal REST API
  • Out of the box bootstrap themes
  • A Portal Jump Start kit
  • Cloud Certification (on JCS)

However, there is also (more...)

OOW15: New features in ADF 12.2.1

The whole stack of Fusion Middleware 12c  was launched just before open world. This means there is also a new, cooler and better version of Oracle Application Development Framework (ADF) out! It was not too hard to follow all the session about ADF on open world this year, there were not that many to begin with. 

So what is new? To start with, the infrastructure, we can now use JDK 8 in ADF and (more...)

Introducing Oracle ASM Filter Driver

The Oracle ASMFD (Filter Driver) was introduced in Oracle Database and as of the moment it is available on Linux systems only.

Oracle ASM Filter Driver is a kernel module very much like the ASMLIB that resides in the I/O path of the Oracle ASM disks. It provides an interface between the Oracle binaries and the underlying operating environment.

Here are some of the features of ASMFD:

  • Reject non-Oracle I/O

The (more...)


There might be a situation where executing some DDL in pluggable database may cause the following error:

ORA-65040: operation not allowed from within a pluggable database

This error could occur if a tablespace is being dropped from within PDB and this tablespace is a former default tablespace having some of the system objects. Even system objects cannot be moved with simple alter statements from within PDBs.

So in order to move these objects from within (more...)

What AWR isn’t telling you

It is well-known that AWR, and Statspack before, take snapshots of V$ views (or rather the underlying objects) to produce the data in AWR.

It is also well-known that, when considering sql and its statistics in the shared pool, if something big hitting happens but the big-hitter is no longer in the shared pool by the time of the snapshot, then it can’t be recorded in your AWR picture of activity.

But like many things (more...)

Quick Cross-Period AWR Time Model Comparison

Here’s a query which I find useful in order to have a very quick comparison across AWR snapshots of the high level time model statistics.
The numbers should match those in the associated section in the AWR report.

If you feel compulsed, obsessively, with tuning then you may see some blips here and there which then encourage you to dive into the AWR detail for that snapshot.

Or quite often I get in in the (more...)

12c datapatch – take care of parallel patching

datapatch is a nice new feature in recent Oracle database installations. It helps to ensure the databases objects match the binaries after any kind of patching and so avoid situations which can be an operational and support nightmare - and very hard to identify.


Unfortunately it has some drawbacks as well.
One of those I hit recently when running datapatch on 2 instances which uses the same ORACLE_HOME.
At some time in it's progress (more...)