> For the complete documentation index, see [llms.txt](https://upsolver.gitbook.io/content/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://upsolver.gitbook.io/content/reference-1/functions-and-operators/functions/aggregate/dynamic_sessions.md). # DYNAMIC\_SESSIONS Collects an array of session start and end times, where a session is defined as a group of events that are not separated by a gap of more than the configured window size. ## Syntax ```sql DYNAMIC_SESSIONS([MAX_SESSIONS,] TIME, WINDOWSIZE) ``` ## Arguments #### `MAX_SESSIONS` Type: `integer` Default: 2,147,483,647 (Optional) The maximum number of entries that are counted. #### `TIME` Type: `numeric` The time value associated with each event. This is the value that is used to calculate the gap. #### `WINDOWSIZE` Type: `numeric` The window gap size to use. A session is defined as a group of events that are not separated by a time gap larger than `WINDOWSIZE`. This value should be in the same time unit as `TIME`. ## Returns Type: `array` Returns an array of session start and end times based on the values in `TIME` with session length being configured by `WINDOWSIZE`. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://upsolver.gitbook.io/content/reference-1/functions-and-operators/functions/aggregate/dynamic_sessions.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.