How are sequences defined in database management?

Sequences in database management are defined as ordered collections of objects where repetitions are allowed. This concept is particularly relevant when dealing with data types such as sequences in programming or database systems where the order and potential for duplicate entries play a significant role. For instance, a sequence can represent a series of events or transactions that occur over time. Being ordered means that the elements within the sequence have a defined sequence, which can be crucial for tasks like maintaining the integrity of data or ensuring that operations are performed in a logical order.

In the context of databases, sequences can also be referenced in relation to generating keys for unique records. However, the concept of sequences focuses more on the arrangement and allowances for duplicates rather than simply functioning as unique identifiers. This understanding is foundational in managing data structures and ensuring that data can be processed effectively within relational databases, enhancing operations such as querying, sorting, and analyzing datasets.