> 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/server-management/server-monitoring-logs/transaction-coordinator-log.md).

# Transaction Coordinator Log

{% columns %}
{% column %}
{% content-ref url="/pages/EefaNEF6d4MeISmYqjIq" %}
[Transaction Coordinator Log Overview](/docs/server/server-management/server-monitoring-logs/transaction-coordinator-log/transaction-coordinator-log-overview.md)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
Explains the purpose of the Transaction Coordinator (TC) log (`tc.log`), which maintains consistency for XA transactions that affect multiple storage engines, and how to configure it.
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="/pages/eUYhCQLVvGPBhh4Q6F8h" %}
[Heuristic Recovery with the Transaction Coordinator Log](/docs/server/server-management/server-monitoring-logs/transaction-coordinator-log/heuristic-recovery-with-the-transaction-coordinator-log.md)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
Describes the process of heuristic recovery using the TC log to resolve "in-doubt" transactions that may occur after a server crash during a 2-phase commit.
{% endcolumn %}
{% endcolumns %}