As I am attending Open World 2009 on blogger credentials, it seems proper I should actually blog about it.
So, here it is. I won't be blogging about keynotes or other things that will appear in the news the following day, but rather on some of the sessions I attend.
As I got back to my room too late and too tired to do this properly on Monday, I am putting Sunday and Monday in the same post.
Here goes:
Open World - Sunday 10/11/2009
While attending Oracle Open 2009, I thought it a good idea to make some report of sessions attended, and any interesting developments at OOW.
Some of the sessions I attended may not be considered DBA topics. I thought it would be interesting to break out of the DBA mold for a bit and attend some sessions that might be a bit outside the DBA realm.
Sue Harper - Everyday Tasks with Oracle SQL Developer
Sue Harper is the product manager for SQL Developer, and was presenting some of the useful new features of the SQL Developer 2.1 Early Adopter release.
While I have used SQL Developer from the time it was first released as Raptor, I have not until recently used it simply as a database browsing tool. After exploring some of the features that allow writing reports with master/detail sections, I converted some SQLPLus scripts for use with SQL Developer.
SQL Developer is a very capable tool, so I attended this session to see what else I might be missing out on.
There was only one hour allocated for the session, and given the first 15 minutes were consumed convincing the audience why they should be using SQL Developer, there was just that much less time available to see the new features.
Taking a few minutes to market it is probably just in the product manager DNA.
Some of the features demonstrated were actually available in 1.5, but maybe not widely known. As I have not used 2.1, I won't always differentiate between versions here. Some of these features may not be new to 2.1, maybe just improved.
Though not a new feature in 2.1, a few minutes were used to demonstrate the use of the built in version control integration. This is a very useful feature, and can be setup for seamless integration for CVS, SubVersion, Perforce, and one other I can't recall now. It's definitely worth a look.
Some features that are new to 2.1 looked very useful:
Persistent column organizing and hiding. When viewing data in SQL Developer, the columns may be easily rearranged and selected or de-selected for viewing. While previous versions allowed dragging columns around, 2.1 has a nice dialog that makes this much easier.
New to 2.1 is column filtering. By right clicking on a cell in the data pane, a dialog can be brought up to filter the data based on values found. This allows filtering the data without requerying the table.
Also new to 2.1 is an XML DB Repository Navigator. It was mentioned, but alas there was not time to demonstrate it.
http://www.oracle.com/technology/products/database/sql_developer/index.html
http://sqldeveloper.oracle.com/
Christoper Jones - Python/Django Framework
This was a hands on developer session centered on using the Python scripting language with the Django Web application framework. This was a fun session. The lab was already setup, running Oracle Linux VM's with access via individual laptops setup in the training room.
The lab was a go at your own pace session, with instructions both printed and available via browser. Browser based was the way to go with the instructions, as the examples could be cut and pasted, saving a lot of time typing.
I wasn't able to quite complete the lab as I kept encountering an error when running the web app. It was probably due to an error in one of the scripts I modified during the session, but enough was accomplished to see that the Django Framework looked very interesting. Perhaps even simple enough to use for a DBA. Yes, I did search the schedule for a similar Perl session, perhaps using Mason or somesuch.
The training materials are going to be placed on OTN in the Oracle By Example section after Open World concludes.
http://www.oracle.com/technology/obe/start/index.html
Ray Smith - Linux Shell Scripting Craftmanship
The last session I attended on Sunday was all about shell script craftsmanship. Ray Smith was sharing some common sense methods that can be used to greatly enhance your shell scripts.
If you have done any software development, the information presented would be similar to what you already know.
- Use white space and format your code for readability.
- Don't be overly clever - other people will have to read the shell script.
- Format your scripts with a header explaining the purpose of the script, and separate sections for independent and dependent variables, and a section for the code.
- Use getops to control command line arguments.
Smith strongly advocated that everyone in the audience obtain a copy of the book "The Art of Unix Programming" by Eric S. Raymond. This is not a new book by any means, but Smith drew upon it for many of the principles he advocated in scripting.
A couple of tools new to me were mentioned:
Zenity and Dialog - both of these are graphical dialog boxes that may be called from shell scripts in linux.
http://freshmeat.net/projects/zenity
Dialog is installed with linux, so just do
man dialog to check it out.
It was an interesting presentation. Though a lot of it was not new to me, the two dialog tools mentioned were, showing that no matter how well you think you may know a subject, you can always learn something from someone else.
Open World - Monday 10/12/2009
Jonathan Lewis Unconference - How to be an Expert
http://www.jlcomp.demon.co.uk/
http://jonathanlewis.wordpress.com/
Jonathan Lewis had an interesting unconference presentation.
http://wiki.oracle.com/page/Oracle+OpenWorld+Unconference
In a nutshell, it comes down to this:
You must practice, and practice quite a lot.
To make the point, he used the joke about the American Tourist asking the grounds keeper how the lawns of the Royal Estates are maintained to be so lush, have such and even texture and in short, to be so perfect.
The groundskeeper explained while the tourist took notes.
First you must dig down 4 inches.
Then you must put down a layer of charcoal.
Then another 1 inch layer find sharp sand.
Finally a layer of fine loam goes on top.
You then must seed the lawn, and water it very well for 6 weeks.
After 6 weeks, you must cut the grass, being very carefully to remove only a small amount as you mow. This must be done three times a week.
And then you continue doing this for 200 years.
Ok, everyone had a good laugh at that, but the point was made.
Reading some books and being able to run some scripts does not make you an expert. Lots and lots of practice may make you an expert, if you apply yourself well.
During the presentation he asked a number of questions of the audience made up mostly of DBA's. I will reprise a couple of them here.
Q1: Assuming you have a simple heap table, with no indexes, you update a single column in 1 row of the table. How many bytes of redo will that generate?
Q2: Who of you in the audience when you insert data into a table, deliberately insert duplicate data into the database?
I will leave you to speculate on the answers a bit.
Of those 2 questions, only 1 was answered correctly by the audience.
Leng Tan and Tom Kyte DBA 2.0 - Battle of the DBA's
What is the difference between a DBA 1.0 (the old days) and a DBA 2.0 ( the modern DBA)
DBA 2.0 has modern tools, self managing database enabled by AWR and the Diag and Tuning packs.
DBA 1.0 uses scripts and works from the command line.
One the stage in addition to Kyte and Tan were two DBA's, each with a laptop and an oracle server to work on.
Two scenarios were presented for a timed hands on problem that each DBA must work through.
First scenario - Security Audit
Each DBA is given 6 minutes to do a database audit and report on possible vulnerabilities
DBA 1.0 ran scripts to check for open accounts, default passwords, publicly granted packages and umask settings.
After doing so he ran a script to remove privileges granted to PUBLIC, and locked a couple of accounts.
DBA 2.0
DBA 2.0 worked from the Oracle Enterprise Manager console, using the Secure
Configuration for Oracle Database.
He was able to observe the database security score, navigate through several screens and correct the same security problems that DBA 1.0 did. Following that he was able to see that the security score for the database had improved.
So the conclusion made by the presenter is that OEM is clearly superior because OEM will automatically generate the needed data every night.
By contrast DBA 1.0 can only do one db at a time.
I do not believe this demonstration to be a valid comparison - it's quite simple to run the script against any number of databases from a script, and report on anomalies.
At this point it should be mentioned that DBA 1.0 spent 4 minutes explaining what he was going to do, another minute explaining what the scripts were doing, with less than 1 minute spent actually running the scripts.
By comparison, DBA 2.0 was navigating through screens through nearly the entire 6 minutes.
The statement was made by the presented that doing this with scripts at the command line was far too tedious a task, and DBA 1.0 would never be able to accomplish the task for 200 databases.
I won't belabor the point (well, not too much) but automating these kinds of tasks is relatively simple for command line tools. Which is easier and more productive? Automating a set of scripts to poll all of your databases, or navigate through OEM for 200 databases?
The present referred to using OEM as "really convenient" Sorry, but I have never found OEM to be at all convenient. Whenever I run into problems with it, it requires a SR to fix it.
Thetre was a round 2 as well regarding testing execution plans both before and after setting optimizer_features _enable to a newer version. OEM fared well here compared the the scripting method as the scripts used 'explain plan' and OEM actually executed the queries to gather execution plan information.
That isn't to say however that the scripts could not be modified to do the same. No, I am not completely against GUI environments. I am just against making more work for DBA tasks.
Enough for now, I will report on Tuesdays conferences later this week.
