dmann's blog

ASH to the rescue... for now...

After 4 unexplained crashes and a stalled Sev 1 SR I was pulling my hair out. Particularly vexing was the fact that a user was running a distributed query which was crashing a remote database. I isolated the 4 crash times for the remote database and I wanted to see what users and SQLs were running on the local database up until the crash time. So for a crash happening around 11:16 I would use the following query.

Making ASMCMD do what you want it to do... like copy files recursively...

To troubleshoot a problem I needed to copy a database's worth of files out of an ASM diskgroup and onto the filesystem. I searched around and checked help for ASMCMD assuming there was a recursive option. I found references to one in some places on the interwebs, even official Oracle references to it like Unable To Copy Directory Using ASMCMD Cp -r Command (Doc ID 829040.1) but struck out when trying to do this on 11g and 12c ASM installs.


ORA-01440 trying to convert FLOATs to NUMBERs

I recently came across a legacy database that was using Oracle FLOAT datatype for Primary and Foreign Keys. As the database needed some attention I was asked to get data types in order and get rid of the FLOATs in favor of NUMBER data types.

Heat map for Redo Size in SQL Developer...

I've gotten a lot of mileage out of my old SQL Developer Archive Log Count Heat Map report that I created in SQL Developer. I was recently asked to estimate the amount of redo that might be sent to a DataGuard standby. Searching The Google for this and I found some methods for calculating Network Bandwidth but I wanted to start with raw redo generated from an instance using information from v$archived_log.

Cloud Control Error EM-04050 when trying to upgrade a plugin...

I was recently asked to update the EBS Plugin from to in my Cloud Control 12 setup. During the prereq steps I got an error: "EM-04050: The selected plug-ins cannot be deployed on the Management Server because there are some Management Agents on which incompatible versions of these plug-ins have been deployed."

5 in 5 Vizualization 2 - Generating a d3.js visualization from a SQL Developer HTML report...

This second vizualization is more of a workflow proof of concept compared to some novel visualization but I can guarantee you haven't seen the SCOTT.EMP table like this before. I have wanted to combine my two favorite tools for a while. Here is how you can drive a d3.js visualization directly from a SQL Developer custom report.

SQL Developer 4 User Defined Reports

I enjoyed giving my presentation on SQL Developer User Defined Reports to the 2014 East Coast Oracle Users Conference. This is a local conference that is a great value and pulls in lots of fun folks that attend and present. DMann-SQLDeveloper4Reporting.pdf

Check out my GitHub project for examples and source code :

August - Visualization 1 - SQL Execution Plan Volatility

The first visualization I will be working on is something I have been wanting for a while. I need a way to quickly show SQL Statement performance over time for 1 statement, especially to identify Execution Plan volatility. When researching performance problems I often need to quickly digest historical performance of a trouble statement - a statement that usually has run fine for years but now has started acting up.

5 in 5 - 5 Oracle visualizations in 5 months...

It is time for me to get my rear in gear. I have tons of notes floating around on Oracle administration and performance related visualizations I would like to work on but without a deadline things start dragging out... Like when you have a weight loss or stop smoking goal that becomes real when you tell people about it.

Slides and Examples for Time for Some New Graphs...

I gave my talk "Time for Some New Graphs: Incorporating Time and Animation Elements into Your Web App Visualizations" at KScope14 this week. As usual KScope has delivered on content and experts. I have been enjoying immersing myself in the Administration and Apex tracks.
Here are the slides to my presentation : Time For Some New Graphs - Slides


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