The first part of an ETL process involves extracting the data from the source system(s). In many cases this represents the most important aspect of ETL, since extracting data correctly sets the stage for the success of subsequent processes.
The sinus venosus is a large quadrangular cavity which precedes the atrium on the venous side of the chordate heart. In mammals, it exists distinctly only in the embryonic heart (where it is found between the two venae cavae); in nonmammalian chordates, however, the sinus venosus persists in the adult.n the adult, it is incorporated into the wall of the right atrium to form a smooth part called the sinus venarum, also known as the venarum sinus, which is separated from the rest of the atrium by a ridge of fibres called the crista terminalis. The sinus venosus also forms the SA node and the coronary sinus.
Ocean Sunfish Description. The body of the Ocean Sunfish is very flat and then it has a typical type of fish head and tail. When you look at it from the head back it gives an oval shape.They can be up to 10 Â½ feet long.They can range in color based on location. Some of them are gray while others are white. They can also be brown or silver.cean Sunfish Description. The body of the Ocean Sunfish is very flat and then it has a typical type of fish head and tail. When you look at it from the head back it gives an oval shape.