A good maxim to bear in mind when designing reports
Jeff Atwood of Coding Horror fame observed:
This is sage advice (if a little crude :-)) to bear in mind when building reports for users.
Better safe than sorry…sanitising DB input
As Twitter learnt yesterday, you should always sanitise user input. I was amused to see My Oracle Support doing so….recursively :)
The apostrophe in “doesn’t” got escaped once, and then again, and then again, and then again, and then again ……
TortoiseSVN doesn’t prompt for authentication
Here’s one in the series of stupid things I’ve done but which Google has thrown no answers, so I post it here to help out fellow idiots.
Today’s episode involves our SCM tool, TortoiseSVN. I’d been happily using it for over a year, when suddenly I couldn’t commit any more. I could browse and checkout to my heart’s content, but when I tried to commit, boom:
Commit failed (details follow): Authorization failed
The danger of averages - Measuring I/O throughput
This query, based on AWR snapshots on sys.wrh$_sysstat, includes in its metrics the I/O read throughput for a given snapshot duration.
However it’s important to realise the huge limitation to this figure - it’s an average. It completely shoots you in the foot if you’re looking at capacity requirements.
Consider this real-life example extracted from the above query:
[sourcecode] Timestamp Total Read MBPS =========================================== 14-SEP-10 05.15.12.660 113.748 14-SEP-10 06.00.40.953 202.250 14-SEP-10 06.
RTFM? But where TF is the FM? >> Offline searchable OBIEE 11g documentation
I’m a geek. I like understanding things in their absolute entirety. It frustrates me to have to make presumptions or assumptions about something. I like to get down ’n dirty and find out what makes things tick.
So that necessitates reading manuals. And unfortunately, Oracle don’t make that easy all the time.
Some of the manuals are not very good, and others are difficult to find. Given the complexity of the OBIEE stack and proliferation of terminology and product names, sorting the wheat from the chaff can be a headache.
A fair bite of the CPU pie? Monitoring & Testing Oracle Resource Manager
Introduction We’re in the process of implemention Resource Manager (RM) on our Oracle 11gR1 Data Warehouse. We’ve currently got one DW application live, but have several more imminent. We identified RM as a suitable way of - as the name would suggest - managing the resources on the server.
In the first instance we’re looking at simply protecting CPU for, and from, future applications. At some point it would be interesting to use some of the more granular and precise functions to demote long-running queries, have nighttime/daytime plans, etc.
Misbehaving Informatica kills Oracle
This problem, which in essence is bad behaviour from Informatica bringing down Oracle, is a good illustration of unintended consequences of an apparently innocuous security setting. Per our company’s security standards, database passwords expire every 90 days. When this happens users are prompted to change their password before they can continue logging into Oracle. This applies to application user IDs too. It appears that Informatica 8.6.1 HF6 (part of OBIA 7.
BI Publisher - error creating Quartz tables
A very short blog post to break the drought, but I didn’t hit any google results for this error so thought it might be useful to record it.
In BI Publisher 10.1.3.4, trying to install the Scheduler (Quartz) schema, I got this error:
[sourcecode]Schema installation failed while creating tables. Schema may already exist. Please remove the existing schema or choose another database and try again.[/sourcecode]
To me, the error text is a bit unhelpful.
Measuring real user response times for OBIEE
@alexgorbachev tweeted me recently after picking up my presentation on Performance Testing and OBIEE. His question got me thinking, and as ever the answer “It Depends” is appropriate here :-)
Why is the measurement being done? Without knowing the context of the work Alex is doing, how to measure depends on whether the measurement needs to be of: -
The actual response times that the users are getting, or The response times that the system is currently capable of delivering This may sound like splitting hairs or beard-scratching irrelevance, but it’s not.
Scripts to extract information from OBIEE NQQuery.log
Here are a couple of little unix scripts that I wrote whilst developing my performance testing OBIEE method.
They’re nothing particularly special, but may save you the couple of minutes it’d take to write them :)
Note that some of this data is available from Usage Tracking and where it is I’d recommend getting it from there, databases generally being easier to reliably and repeatably query than a transient log file.
OBIEE 11g launch date - 7th July 2010
OBIEE 11g is going to be officially launched on 7th July (this year!) in London: Launch Event: Introducing Oracle Business Intelligence Enterprise Edition 11g
h/t to Twitter and blogs (including an Oracle-branded one) this morning. Good news travels fast! :-)
Looks like John Minkjan won the bet, did he know something we didn’t? ;-) (although is “Launch” the same as “GA”?)
Performance Testing and OBIEE
Here’s my presentation “Performance Testing and OBIEE” that I gave at the RittmanMead BI Forum 2010: Performance Testing and OBIEE.pptx
It’s a Powerpoint 2007 file (pptx) for which you may need the Microsoft PowerPoint Viewer 2007. I’ve included copious notes on each slide which hopefully cover the gist of what I talked about when I was delivering it. There are also a handful of funky animations which is why I’ve left it in pptx and not exported to PDF or other format (sorry Open Office users).
My first presentation - afterthoughts
I delivered my first presentation today, at the RittmanMead BI Forum.I was really nervous in the hours and minutes leading up to it, but once I got up there and started talking I actually quite enjoyed it. If you were in the audience, I’d love some feedback in the comments section below, particularly any “constructive criticism”. I obviously didn’t make too much of a mess of it, as I was awarded “best speaker” of the event, which was a great honour.
RittmanMead BI Forum 2010
I’ve just returned from the RittmanMead 2010 BI Forum which this year was at the Seattle Hotel in Brighton Marina.
The event was limited to 50 attendees, and I think this was a good number. The event was explicitly pitched at a very technical expert level, and the audience very much represented this. Whereas at a larger conference you may find the odd manager wandering around pretending to be technical ;-) this event was most definitely not pitched at such types.
Validating EBS-BI authentication, without BI
Troubleshooting EBS-BI integrated authentication can be a tiresome activity, so here’s a shortcut that might help. If you suspect the problem lies with EBS then you can leave OBIEE out of the equation.
Login to EBS
Use FireBug or Fiddler2 to inspect web traffic as follows:
Click the BI link from EBS
Should be first a request to EBS server, which returns 302 and redirects to http://<bi server>:<port>/analytics/saw.dll?Dashboard&acf=101507310
Record the value of acf (eg 101507310)
What am I missing here??? ORA-01017: invalid username/password; logon denied
What’s going on here? The username/password is definitely valid, proved by the sqlplus connection.
Configuring DAC in OBIA 7.9.5.1:
[sourcecode] What can I do for you?
1 - Enter repository connection information 2 - Test repository connection 3 - Enter email account information 4 - Send test email 5 - Save changes 6 - Exit
Please make your selection: 1
These are your connection type choices:
1 - MSSQL 2 - DB2 3 - Oracle (OCI8) 4 - Oracle (Thin) 5 - Keep current ( Oracle (Thin) )
RTFAL!
This is a note-to-self really. When playing around with Oracle and something’s not working - RTFAL: Read The Flippin Alert Log!
After resizing a VM I was getting this problem: [sourcecode] [oracle@RNMVM01 ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Sat Apr 24 17:44:44 2010
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup nomount ORA-00845: MEMORY_TARGET not supported on this system SQL> [/sourcecode]
Opera + Oracle EM = true love
A faithful FireFox user for many users, I’ve been having a rather delightful rekindling of my old love for Opera recently. Back in the days, when I was a beardless bairn, I even paid for Opera I liked it so much. Then Firefox came along and Opera got dropped by the wayside like a teenage crush.
Well Opera 10.5 was released recently and I’m liking it. I miss my Firefox extensions too much to switch entirely, but damn, Opera is FAST!
My first presentation - help!
I’m doing my first ever conference presentation next month at the 2010 Rittman Mead BI Forum.
My presentation is called Performance Testing OBIEE, which is something I’ve spent a lot of time working on over the last few months. I think the challenge is going to be distilling it all into a session that’s not going to overwhelm everyone or bore them to death! Well, actually, the challenge is going to be the presenting.
OBIEE 11g tidbit - XUDML support
Spotted this when trawling through My Oracle Support. It’s pretty common knowledge anyway amongst people already familiar with hacking around with OBIEE, but worth recording for people coming along to it new.
Doc ID 1068266.1 states:
UDML is not supported in OBI 10g.
in 11g, XUDML (the Oracle BI Server XML API) will be fully supported and documented.
