General Info Concurrent access is something that all databases and dbas need to deal with daily. This is the case for internal databases but also the case for bases that deal with external users like the booking system mentioned in the question. Maintain data integrity is the primary goal of a database is slightly out of date, data is better than inaccurate data. Concurrent access is when two transactions are trying to accrue at the same time on a database. For example, two people booking the same year or downloading the same file at the same time. Mechanism 1 The first mechanism an RDBMS (relational database management system) is the locking of the database. This can mean both users are locked out of the system but often it is the second user trying to access that gets locked out. This is most likely to happen when someone is trying to buy a unique product. The most common examples of this are the buying of a ticket for public transport...
As I write this blog post, it is two months to the day since I returned to Ireland from my year in Germany. With that in mind, I decided to put a list together of what emotions, feelings, and realizations have hit me over that time. I wanted to write this piece about two weeks before starting University again, but at the time I found my mind was still abroad and it was too early to write such a blog post in a manner that would reflect reality. 1) Your body and mind will feel out of sink When leaving your newly adopted home, you say many goodbyes followed by many hellos. You pack your things up and then unpack again while dealing with annoying and over-crowded airports in between. All of these actions would suggest that you are home for good, but it takes your brain time to fully understand that you’re not going back. Even if it is just that one per cent of you that is not willing to accept the fact yet. 2) Your heart won't break but it will be divided Before moving t...
Intro There is an increasing dilemma when it comes how data is collected. It is easy to see why when many writers have said that we have created more data in the last two years that we have in all of human history. The old saying is that knowledge equals power and with great power comes great responsibility. Teachnology in itself is becoming less of a competitive advantage as the latest tech is so assessable. This means the way the way to gain an advantage is with the use of data and becoming “data driven” Data is king and organisations are finding new ways of getting it, often in ways that people are not aware off. One does not need to go far to find someone who is convinced that their device is listening to their conversations for example. How has this data collection happened? Data has gotton out of control for many reasons but one big reason is that people had and still don’t understand how their data is collected. Many companies offer people terms and conditions...
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