# Custom Log Settings and reaching log files

*B2C Commerce Developer Study Guide · Data Management Using Business Manager Usage · Last updated November 3, 2026 · https://www.certifyforce.com/study-guide/b2c-commerce-developer/data-management-using-business-manager-usage/custom-log-settings-and-reaching-log-files*

Turning script logging on and finding its output: Custom Log Settings levels per category and fatal email, why debug never reaches files on production, the Request Log on sandboxes, the WebDAV routes to the Logs folder, and the size, retention and suppression rules that make messages disappear.

- Certification: Salesforce B2C Commerce Developer
- Exam section: Data Management Using Business Manager Usage
- Study guide: https://www.certifyforce.com/study-guide/b2c-commerce-developer

**Official exam objective:**

> Given a debugging requirement or code, configure the logging categories and access the logs in Business Manager.

## What the exam expects

- Enable the right level for a log category in Custom Log Settings so script messages reach a custom log file, and set up email for fatal messages.
- Explain why debug output never appears in production files and choose a workable alternative.
- Get detailed errors for a request on a sandbox with the Request Log, and reach log files through Development Setup or a WebDAV client.
- Apply the 10 MB daily cap, the 30-day and 90-day retention rules, `log_archive`, and redundancy suppression to explain missing or vanished messages.
- Recognise the custom named log file limits that make `getLogger` throw.

Key terms: **log category** (the name passed to `Logger.getLogger`, configured per level in Business Manager); **custom log file** (a `custom*` file written by script logging); **Custom Log Settings** (the Operations page that enables levels per category); **in-memory logging** (debug capture on non-production instances that feeds the Request Log without writing files); **Request Log** (a Storefront Toolkit tool showing the log entries of recent server calls).

## Key facts

| Fact | Detail | Source |
|---|---|---|
| System logging | On by default; changes go through Salesforce Support | [Log Files](https://developer.salesforce.com/docs/commerce/b2c-commerce/guide/b2c-log-files-overview.html) |
| Custom debug and info | Disabled by default; enabled per instance in Custom Log Settings | [Log Files](https://developer.salesforce.com/docs/commerce/b2c-commerce/guide/b2c-log-files-overview.html) |
| Debug on production | Always disabled | [Log Files](https://developer.salesforce.com/docs/commerce/b2c-commerce/guide/b2c-log-files-overview.html) |
| Fatal messages | Always enabled; optional email, sent once every minute | [Class Log](https://developer.salesforce.com/docs/commerce/b2c-commerce/references/b2c-script-api/dw.system.Log.html), [Log Files](https://developer.salesforce.com/docs/commerce/b2c-commerce/guide/b2c-log-files-overview.html) |
| Daily cap | 10 MB per custom file per application server; resumes 00:00 GMT | [Log Files](https://developer.salesforce.com/docs/commerce/b2c-commerce/guide/b2c-log-files-overview.html) |
| Retention | 30 days (security 90) on production and staging | [Log Files](https://developer.salesforce.com/docs/commerce/b2c-commerce/guide/b2c-log-files-overview.html) |
| Log access | Development Setup > WebDAV Access, or WebDAV client; no sFTP | [Log Files](https://developer.salesforce.com/docs/commerce/b2c-commerce/guide/b2c-log-files-overview.html) |
| Request Log | Recent server calls, including AJAX, with exceptions and custom logging | [Examine Server Calls Using the Request Log](https://help.salesforce.com/s/articleView?id=cc.b2c_using_the_request_log.htm&type=5&language=en_US) |
| Named log files | 200 file names per day per application server | [Log Files](https://developer.salesforce.com/docs/commerce/b2c-commerce/guide/b2c-log-files-overview.html) |

## Check yourself

- Why can system logs keep growing after the custom files have stopped for the day?
- When are files in a log folder deleted before their retention ends?
- Which WebDAV folder holds the records of Business Manager logins?
- Who can alter the platform's own (non-custom) logging setup?

## Sources

- [Log Files](https://developer.salesforce.com/docs/commerce/b2c-commerce/guide/b2c-log-files-overview.html)
- [Troubleshooting](https://developer.salesforce.com/docs/commerce/b2c-commerce/guide/b2c-troubleshooting.html)
- [Class Logger](https://developer.salesforce.com/docs/commerce/b2c-commerce/references/b2c-script-api/dw.system.Logger.html)
- [Class Log](https://developer.salesforce.com/docs/commerce/b2c-commerce/references/b2c-script-api/dw.system.Log.html)
- [Examine Server Calls Using the Request Log](https://help.salesforce.com/s/articleView?id=cc.b2c_using_the_request_log.htm&type=5&language=en_US)
- [Log Center](https://help.salesforce.com/s/articleView?id=cc.b2c_log_center.htm&type=5&language=en_US)

## About the full unit

The "Core concepts", "Exam traps" and "Worked scenario" sections of this unit, its 9 linked practice questions, and unlimited timed mock exams are included with the B2C Commerce Developer pack (USD $19): https://www.certifyforce.com/practice-exams