...
Initial loads (Load All in ETL+) loads the entire source table from the source into the target data warehouse table. The difference in performance between delta load and initial load depends on factors such as data volume, structure, target, and load type.
CreatedAt/InsertedAt Columns
A column that indicates the order in which rows were added to a table are typically referred to as a "CreatedAt" or "InsertedAt" column. This column usually stores a timestamp indicating when each row was inserted into the table or is a sequentially assigned code such as a order or invoice number.
LastModified/UpdatedAt Column.
A column that indicates the order in which rows were added or updated to a table can be referred to as a "LastModified" or "UpdatedAt" column. This column usually stores a timestamp indicating when each row was inserted into the table or is a sequentially assigned code such as a order or invoice number.
A Change or Modification Flag Field is a special type of LastModified/UpdatedAt Column.
| Anchor | ||||
|---|---|---|---|---|
|
Sequentially assigned codes such as order numbers or invoice numbers can be used to track the order of operations or events in a system. These codes are often used as primary keys, typically include a number, and are assigned in a sequential manner as new events occur.
WaterMarks
A watermark is a column that has the last updated time stamp or an incrementing key. The delta loading solution loads the changed data between an old watermark and a new watermark.
...