20/12/2016

Facebook and Airbnb login bug, now you are someone else

Well, everyone nowadays is running around trying to spot and fix bugs for money and I just stumble upon someone else's information for free.

This is an unexpected Christmas gift given it happened close to this huge fail from VISA, which makes it possible to guess full credit card details in a frighteningly fast amount of time. So read that article first, and then image what could someone do if they had all your personal info, including partial credit card data.

18/12/2016

Eau de Cologne

Cologne: the only place where you can party hard and still smell good in the morning.



Click on the image to view the full album. Note: due to low quality phone camera, it's best not to blow the pictures up to 100%.

And bonus points because I finally received the recognition I deserve and my artwork is proudly exposed in the Ludwig museum:


10/12/2016

[Oracle] Initialise DB statistics to improve performance

A couple days ago we were analysing a customer issue concerning DB performance on simple and already optimised queries (indexes + hints).

Somehow, the customer had bad performance even after calculating statistics for tables and indexes. Turns out that everything was good except for the fact that Oracle can't imagine future statistics without some help; if a table is only filled after some time that the applications run, it is important to gather statistics again after the first initialisation.

It is also possible however to provide fake statistics immediately after the objects are created or modified so that the DB already has an idea of how the objects will look like and choose different query execution plans than the ones it would use for freshly created objects.

That's what the DBMS_STATS package and its EXPORT__STATS and IMPORT__STATS procedures are for.

[Oracle] List uploaded Java resources

After extending functionality on an Oracle DB with Java resources, it is possible to list the available ones and their status with a query on the user_objects table:

SELECT
  object_name
 ,object_type
 ,status
 ,timestamp
FROM
  user_objects
WHERE
  (    object_name NOT LIKE 'SYS_%' 
   AND object_name NOT LIKE 'CREATE$%' 
   AND object_name NOT LIKE 'JAVA$%' 
   AND object_name NOT LIKE 'LOADLOB%'
  ) 
AND object_type LIKE 'JAVA%'
ORDER BY
  object_type
 ,object_name
;