> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/server/reference/clientserver-protocol/replication-protocol/intvar_event.md).

# INTVAR\_EVENT

An `INTVAR_EVENT` is written every time a statement uses an auto increment column or the `LAST_INSERT_ID()` function.

## Header

* Event Type is `5` (`0x05`).

## Fields

* [uint<1>](/docs/server/reference/clientserver-protocol/protocol-data-types.md#fixed-length-integers) Type.
* [uint<8>](/docs/server/reference/clientserver-protocol/protocol-data-types.md#fixed-length-integers) Value.

## Type

| 0x00 | Invalid value.               |
| ---- | ---------------------------- |
| 0x01 | LAST\_INSERT\_ID.            |
| 0x02 | Insert id (auto\_increment). |

## Example From mysqlbinlog Utility, CRC32

```sql
# at 738
#180610 11:20:56 server id 1  end_log_pos 770 CRC32 0xf5a23f2d 	Intvar
SET LAST_INSERT_ID=1/*!*/;
```

## Example Event As It's Written In The Binlog File

```
78 ed 1c 5b 05 01 00 00 00 20 00       x..[..... .
00 00 02 03 00 00 00 00 01 01 00 00 00 00 00 00  ................
00 2d 3f a2 f5                                   .-?..
```

<sub>*This page is licensed: CC BY-SA / Gnu FDL*</sub>

{% @marketo/form formId="4316" %}


---

# 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:

```
GET https://mariadb.com/docs/server/reference/clientserver-protocol/replication-protocol/intvar_event.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.