The way I understand it is, that tightly coupled architecture does not provide a lot of flexibility for change when compared to loosely coupled architecture.
For eg., if two disparate systems exchange messages, the message format has to be the same if they are tightly coupled. If the source uses java, the receiver should be able to read the message using java. Also, if any change is made is made to the source or the receiver systems, the other end has to be modified appropriately.
But in case of loosely coupled architectures, message formats or operating platforms or revamping the business logic does not impact the other end. If the system is taken down for a revamp, of course the other end will not be able to access the service for a while but other than that, the unchanged end can resume message exchange as it was before the revamp.
Tightly coupled clusters are a group of machines that are largely dependent on each other. They are often used when latency is an important factor in the application. For example, a web cluster is often a tightly coupled cluster as the web servers/application servers require quick and consistent access to a shared storage system (network filesystem or database).
Loosely coupled clusters are a group of machines (or groups of groups) which can operate independent of each other. Communications between nodes (or subclusters) is often done via a queuing system. Tightly coupled clusters are a group of machines that are largely dependent on each other. They are often used when latency is an important factor in the application. For example, a web cluster is often a tightly coupled cluster as the web servers/application servers require quick and consistent access to a shared storage system (network filesystem or database).
Loosely coupled clusters are a group of machines (or groups of groups) which can operate independent of each other. Communications between nodes (or subclusters) is often done via a queuing system.
Tightly coupled system refers to group of classes that are highly dependent on one another. The loosely coupled system can be tested and consumed independently of the other concrete classes.
It is similar to difference between Head and Hair !
Difference between IQ levels of 150 and 155 will be similar to differences between IQ levels of 95 and 100
Similar means the same or alike, and dissimilar is the opposite of similar.
Not much difference between them feature are almost similar
the accretion and intussusception are similar
There isn't too much of a difference between elastomers and plastics. The only real difference between them is how far you can stretch them. Other than that they are really similar.
Like= similar equal= congruent
My penis
She enjoys doing 'spot the difference' puzzles.There is a difference between happy and sad.What is the difference between these two cakes?
What are the difference between France and America?What are the difference between France and America?
Hakea are similar but have woody seed pods.
It is something like the difference between ship, car and air-plane: they are hardly similar in any aspect.