Blood counting machines aspirate a very small amount of the specimen through narrow tubing followed by an aperture and a laser flow cell. Laser eye sensors count the number of cells passing through the aperature, and can identify them; this is flow cytometry.
In computing, Extract, Transform and Load (ETL) refers to a process in database usage and especially in data warehousing that performs: Data extraction â extracts data from homogeneous or heterogeneous data sources.
All things being equal, itâs better to have fewer moving parts. ELT has no transformation engine â the work is done by the target system, which is already there and probably being used for other development work. On the other hand, the ETL approach can provide drastically better performance in certain scenarios.