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VOTE-906: Add documentation about mysql configuration limitations. #628

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Mar 25, 2024
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VOTE-906: Add documentation about mysql configuration limitations. #628

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VOTE-906: Add documentation about mysql configuration limitations.
daniel-crowder Mar 25, 2024
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VOTE-906: Add impact level.
daniel-crowder Mar 25, 2024
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11 changes: 11 additions & 0 deletions docs/backend.md
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Expand Up @@ -85,3 +85,14 @@ Review the details in composer.json file under `extra.patches` additionally look
## Migration
Instructions for updating and running migration scripts.

## Database - Mysql
The site utilizes Mysql for its database.

### Limitations
Through its implementation via Cloud.gov there are limitations over what is configurable for Mysql.

#### Setting the MySQL transaction isolation level
Issue: The recommended database transaction isolation level is READ COMMITTED vs REPEATABLE READ.
Description: In addition to being unable to configure Mysql, the alternate solution of setting the isolation level via the database configuration within the settings.php file is not a recommended approach as it sets the isolation level upon each page load which isn't optimal.
Impact: Low
Source: https://www.drupal.org/docs/getting-started/system-requirements/setting-the-mysql-transaction-isolation-level#s-other-methods-to-change-the-transaction-isolation-level