# You are debugging with the wrong database

I feel an urge to tell a story first. So here goes…

Once upon a time, in a far away land, a young prince lived in a shining castle. Although he had everything his heart desired, he was spoilt, selfish and unkind.

But then, one winter’s night, an old beggar woman came to the castle and offered him a single rose, in return for shelter from the bitter cold. Repulsed by her haggard appearance, the prince sneered at the gift, and turned the old woman away. But she warned him, not to be deceived by appearances, for beauty is found within…

Oops, wrong story. Let me try again.

### Once upon a time…

In the Far East, there was an adventurer by the name of Wen Sen* (wuhn suhn). He wandered many lands, climbed many hills and even walked on glaciers. But he’s a scholar at heart, and so he set out in search of knowledge.

[image by Steve Geer]

Wen Sen wanted to find out more about a particular village with strange inhabitants. After travelling many days on foot, he finally reached the village’s gates. Despite his raging thirst, his thirst for knowledge was greater. So he accosted the first villager with

Do you think it’s a coincidence that the first 3 prime numbers are also part of the Fibonacci sequence**?

Getting a blank stare, he leapt to the next villager with

What are your thoughts on the first 3 odd prime numbers forming 2 pairs of twin primes***?

Despite his fervour, Wen Sen didn’t get anything out of the villlagers. He even tried indecent questions such as “Are you divisible by 17?”. Dejected, he slumped at a corner of a building, thoroughly miserable.

An elderly woman approached him and asked,
“Are you alright, young man?”
“I’m fine. I just haven’t found what I am looking for,” Wen Sen sighed.
“Well, what are you looking for?” she asked.
“Your village is supposed to hold the key to unlocking the secrets of prime numbers,” Wen Sen breathed. “But everyone seems confused. What am I doing wrong?“.

“Oh,” the elderly woman’s eyebrows lifted. “You must be referring to our neighbouring Village 2357. This is Village 4680.”

### The real story…

Well, I can’t remember the details. All I remembered was, I was testing my code, and the results on the web page didn’t match the results in the database.

I triple checked my code. I retrieved the results from the database to verify the data. Everything was in order. But why wasn’t the web page showing the correct set of data?

I forgot what triggered it, but I suddenly realised that I was connecting to the wrong database. I was working with databases in development, testing and production environments then. And I forgot to change a configuration setting.

From then on, I was careful about making sure that I’m in the correct database before I do anything else.

* Wen Sen are the closest Chinese characters to my name Vincent. It means “knowledge forest” or “culture forest”, depending on context. And depending on the Chinese characters used, of course. And no, my actual Chinese name isn’t Wen Sen.

** The first 3 primes are 2, 3 and 5. The Fibonacci sequence is 1, 1, 2, 3, 5, 8 and so on.

*** 3 and 5 form one pair of twin primes. 5 and 7 form another.