A sequential scan is a database operation where each row in a table is read sequentially to find the required data, often resulting in slower performance for large datasets compared to indexed access. It is typically used when accessing a significant portion of a table or when no suitable index exists for the query conditions.

Sequential Scan

sequential scan

database operation

each row in a table

required data

slower performance

large datasets

Indexed access refers to the method of retrieving or manipulating elements from a data structure, such as an array or list, using an index or key. This allows for efficient data operations, as the index provides direct access to the desired element without the need to traverse the entire structure.

indexed access

accessing a significant portion of a table

no suitable index

query conditions

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