Metadata is literally “data about data.” The column header names in a row-based data table are metadata, as are the data types associated with each column (text, date, integer, etc.) Summary data is often included in data tables, specifically to speed up queries.
In general, metadata falls into three categories:
Metadata is often very large in size, even when compared to the underlying data it is associated with. Keeping metadata current is an important operational concern; for instance, a database may not consider a write operation to be complete until not only the underlying data, but its associated metadata, is written and confirmed.
Relevant links on the Onehouse website:
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