EM13c: Performance Tuning Access to Read Only Administrators

About six months ago, when I was in the OUGN Spring Conference, someone asked me how they can let developers access to performance tuning pages on Enterprise Manager Cloud Control 13c. He said that they granted full administrator privileges to the developers so they could access the performance page but it’s not acceptable. He also mentioned that they didn’t need to grant full administration privilege to the developers’ EM users while they were using (more...)

Little things worth knowing: using Remote Diagnostic Agent more effectively with profiles

RDA, or the Remote Diagnostics Agent, has been around for a little while. Over the time, and with the growing number of Oracle’s acquisitions it has become, shall we say, a little more difficult to handle. It appears to me as if every one of them will have its diagnostics handled by RDA making it hard to focus on something specific, like for example the database.

I won’t go into very detail of the Remote (more...)

How to Import Data (to Oracle RDBMS) from XML

I wrote a blog post about how to import data from a XML file to Oracle about 7 years ago. I demonstrated how we can use DBMS_XMLSTORE package to parse XML data. Yesterday, I replied a question from a blog reader about that post. He had problem with running my sample script, I did troubleshoot and find out the problem with his script, and while testing the sample script, I noticed that I can write (more...)

Grid Infrastructure 12c installation fails because of 255 in the subnet ID

I was doing another GI 12.1.0.2 cluster installation last month when I got really weird error.

While root.sh was running on the first node I got the following error:

2016/07/01 15:02:10 CLSRSC-343: Successfully started Oracle Clusterware stack
2016/07/01 15:02:23 CLSRSC-180: An error occurred while executing the command '/ocw/grid/bin/oifcfg setif -global eth0/10.118.144.0:public eth1/10.118.255.0:cluster_interconnect' (error code 1)
2016/07/01 15:02:24 CLSRSC-287: FirstNode configuration failed
Died at /ocw/grid/crs/install/crsinstall.pm  (more...)

Basicfile LOBs 4

At the end of the previous installment we saw that a single big batch delete would (apparently) attach all the “reusable” chunks into a single freepool, and asked the questions:

  • Why would the Oracle developer think that this use of one freepool is a good idea ?
  • Why might it be a bad idea ?
  • What happens when we start inserting more data ?

(Okay, I’ll admit it, the third question is a clue about the answer (more...)

G-Cloud – Moving Your Oracle System to Amazon Web Services

G-Cloud was awarded a few weeks ago and we're glad to say that clckwrk were selected as a supplier in the areas of Infrastructure as a Service and Specialist Services.

The services we have on G-Cloud are specifically curated for implementing, moving and managing Oracle systems to the cloud. This is a quick guide for how to combine those services to migrate to the cloud. For public sector users of Oracle technology and applications this is the set (more...)

Becky’s BI Apps Corner: OBIA Back-to-Beginnings – Naming Conventions and Jargon

It's easy to talk about a technology using only jargon. It's much harder to talk about a technology without using jargon. I have seen many meetings between business and IT break down because of this communication barrier. I find it more discouraging when I see this communication breakdown happen between advanced IT staff and new IT staff. For those of us in any technological field, it's easy to forget how long it took to learn (more...)

Columns Affected by Extended Data Type

I am not going to post how to convert to extended data type since there are many blogs on that already.

Just a reminder, there’s no going back; hence have backup and possibly minimize changes during testing to be able to restore (which is ideal and may not be feasible).

Before reverting to MAX_STRING_SIZE=STANDARD, columns affected by extended data type need to be identified.

From Oracle documentation, MAX_STRING_SIZE controls the maximum size of VARCHAR2, NVARCHAR2, (more...)

My OOW Experience, the Prequel

On the first or second year after I became a DBA (somewhere in the year 2000, give or take), I heard about this magical event that is taking place in the Oracle realm. All the top Oracle DBAs and professionals in the world (and maybe a couple of unicorns, I’m not sure) are gathering in a small but beautiful village by the name of San Francisco – and talk about databases. I found this story (more...)

Book Review: Oracle Database Cloud Cookbook with Oracle Enterprise Manager Cloud Control 13c

13cCoverLatest Last week, I had a chance to read the latest book of my friend Porus Homi Havewala. If you’re interested in Oracle Enterprise Manager, you already knew him or at least read one of his articles/blog posts. He’s a Subject Matter Expert (SME) on Oracle Enterprise Manager Technology, Oracle Certified Master (OCM) and Oracle ACE Director. Porus created one of the world’s first blogs dedicated to Enterprise Manager (http://enterprise-manager.blogspot.com), and he (more...)

Why to Attend OOW?

I tweeted and mentioned reasons why people should attend Oracle Open World, but apparently I haven’t written an actual post about it, so I decided to do that now. This post won’t be too long, but it will contain the things I like most in this amazing conference. I divided the experience of OOW to […]

It’s That Time Again! Time for OOW2016!

Yes, it’s that crazy time of the year again, when the city of San Francisco turns red – it’s Oracle Open World (OOW) 2016! If you’re planning on going this year, I hope you have your hotel room booked, because they disappear very, VERY quickly!

Every year just before OOW, the product teams produce what we call Focus On documents, that show you all the sessions (both customer and Oracle presented) around a particular area. (more...)

Converting Crontab to Enterprise Manager Jobs

A customer recently asked me about whether they can convert numerous cron jobs to EM’s Job System. It reminded me that a former manager of mine had posted an article on just how to do this conversion. That manager has since left Oracle, and since his posting was on his own website, I wanted to make sure the intellectual capital wasn’t lost to us if he decided to remove it. The article was written in (more...)

Set all WebLogic log levels to “Inherit” via WLST

Logging is a very useful feature of WebLogic.

Unfortunately the log levels, which are set after a clean install of WebLogic or some of the Fusion Middleware product creates a lot of noise and therefore it costs I/O performance.

Additional after analyzing an issue with logging often resetting the log level is forgotten.

Here you get a script to reset the log levels at regular intervals or after a trace session.

#!/usr/bin/python
execfile('get_environment.py')
 (more...)

Oracle Enterprise Manager Plugin for PostgreSQL

Oracle Enterprise Manager supports 3rd party plugins which can help you to extend its monitoring and manageability capabilities. There are already developers and companies specialized in plugin development. Blue Medora is one of them (and probably the most famous one). In this blog post, I’ll show you how we can use Blue Medora’s EM PostgreSQL plugin, which is part of their True Visibility Suite for Oracle. I’ll download and deploy the plugin on the OMS (more...)

Stop Constantly Adding Disks To Your ASM Disk Groups. Resize Your ASM Disks On All-Flash Array Storage. Adding Disks Is Really “The Y2K Way.” Here’s Why.

This blog post is centered on All-Flash Array(AFA) technology. I mostly work with EMC XtremIO but the majority of my points will be relevant for any AFA. I’ll specifically call out an array that doesn’t fit any of the value propositions / methods I’m writing about in this post.

Oracle Automatic Storage Management (ASM) is a very good volume manager and since it is purpose-built for Oracle Database it is the most popular storage presentation (more...)

#OOW16, San Francisco

This year, 2016, is turning out to be an amazing year again, with #OOW16 being once again on of the apices!

Looking back

After the discovery of the Oracle community in 2012, as a result of a very first trip to downtown San Francisco in 2010 for #OOW10, an amazing chain of events was set in motion. This very first introduction in the Oracle World was as ‘a mere participant’ in this awe-inspring, large (more...)

The Rosetta Stone of Database Platforms

This is a living document that I will continue to update and will add new database platforms to as I go along in my career.  I spend a lot of time translating database platforms I’ve worked in for all tiers of the technical business.  It just seems natural that we might need a location on the web where that information is kept.

alive

I’ll add some diagrams at a (more...)

Commas at the beginning or end of a sql code line

Back in Nov 2015 I commented on a Oracle-L discussion about What happened to SQL*Developer SQL Formatter asking why people liked to see a comma at the beginning of the line in sql code and there was a fair bit of input into how it was easier to use and amend  – think of it like bullet points was one comment.

Fair enough I though and I have used that technique when I remember ever (more...)

The rlwrap utility for DBA.

I spend most of my time as a DBA in linux terminal and sqlplus. Everybody who works with oracle sqlplus knows about its power, but also about its limitations. For many years I have used the rlwrap utility developed by Hans Lub. It gives me command history, and the ability to edit my SQL Plus commands, and use auto completion if I set it up. In this post I will share some tips about installation (more...)