Staging: safeguarding ETL processes

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Staging is closely related to both data management and data recovery in ETL processes.
In order to minimize as much as possible the possible errors or problems in the loading phase of ETL processes , a disk area is normally reserved to be able to recover the data in stages. Therefore, we can say that staging is closely related to both data management and data recovery.

How staging works
First, data is dumped in blocks or stages and independently into an area of ​​the disk called the staging area .

The data is then loaded from the staging area to its amazon database location or system (data warehousing) .







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Advantages of using a staging area
It allows the loading process to be separated by blocks or stages. This is very useful and practical when working with millions of data, as it avoids having to restart the entire process in the event of an error or breakdown. For example, if a power cut occurs, you would only have to repeat the data dump of the specific block in which the incident occurred, with the rest of the information being safe and secure in the staging area .

If implemented correctly, it makes it possible to restart the different phases of the ETL process independently. This means that if, for example, the transformation process fails, it would be enough to repeat this phase again, but it would not be necessary to repeat the previous stage: the extraction stage.

The compilation of the different blocks or stages of the staging process can even be adapted to the needs of the clients, although this is always included in the general ETL process.

Since it is a physically independent disk, it does not affect or slow down other system processes in any way.


Main characteristics of a staging process
Only the ETL developer should have access to the staging area , both to safeguard the confidentiality of the data and to avoid complications arising from someone accidentally trying to access the data through the staging area, which could generate incidents.


Users are never given access to this special staging area , although those with the administrator profile are, not because they actually need it but in case any problem or unforeseen event arises.