# Query Complexity

> The degree of difficulty of answering queries when state is stored as an event history rather than current rows.

Record: `lex:query-complexity`
Kind: quality-attribute
Layer: [Execution Core](https://banes-lab.com/records/layer/execution-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lex-query-complexity

## category

- [Event Messaging Async](https://banes-lab.com/records/lex-category/event-messaging-async.md)

## referenced-by

- [Event Sourcing](https://banes-lab.com/records/arch/event-sourcing.md)