# Galera Functions

- [WSREP\_LAST\_SEEN\_GTID](https://mariadb.com/docs/server/reference/sql-functions/special-functions/galera-functions/wsrep_last_seen_gtid.md): Return the GTID of the most recent write transaction. This function helps determine the transaction ID to use for synchronization waiting.
- [WSREP\_LAST\_WRITTEN\_GTID](https://mariadb.com/docs/server/reference/sql-functions/special-functions/galera-functions/wsrep_last_written_gtid.md): Return the GTID of the client's last write. This function identifies the specific transaction ID generated by the current client's most recent write operation.
- [WSREP\_SYNC\_WAIT\_UPTO\_GTID](https://mariadb.com/docs/server/reference/sql-functions/special-functions/galera-functions/wsrep_sync_wait_upto_gtid.md): Wait for a specific GTID to be applied. This function blocks the client until the node has committed the transaction with the specified Global Transaction ID.


---

# Agent Instructions: 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:

```
GET https://mariadb.com/docs/server/reference/sql-functions/special-functions/galera-functions.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
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.