Slow Query Logs


Slow Query Logs record database queries of concern based on logging rules.


  • Multi-Node Analytics

  • Replicated Transactions

  • Single Node Analytics

  • Single Node Transactions

Configuration Manager

Slow query logging is disabled by default.

To enable and configure slow query logging:

  1. Prepare a Configuration Manager configuration:

    • Set the slow_query_log parameter to 1 to enable slow query logging. The default, 0, disables slow query logging.

    • If needed, set the long_query_time parameter to the threshold in seconds which will trigger logging based on query runtime. long_query_time defaults vary by service.

  2. After a configuration has been prepared with the intended parameters, it must be applied to the desired service for this change to take effect. The service will be restarted when the configuration is applied.

Log Archive

Slow Query Log data is available in the Log Archive.

To download log data:

  1. Log in to the MariaDB SkySQL portal.

  2. Access "Monitoring" in left navigation.

  3. From SkySQL Monitoring, access "Logs" in left navigation.

  4. Select the desired server(s), log types (such as "Slow Query Log"), and time frame, then click the "Download" button to download the logs.

    • Log files can be downloaded in your choice of JSON and/or Slow Query plain text formats.

    • The downloaded .zip archive will contain one file per server, log, day, and format.

Data Retention

  • The Log Archive retains log data for 7 years. Data is retained even if the SkySQL service is deleted.

  • Logs are stored in GCS buckets with HTTPS data-in-transit encryption and Google default (AES256) data-at-rest encryption.

  • Logs are stored by day, by service, by server, by log type.

  • To request log data expungement, submit a Support Request.

  • Data retention requirements vary by business. A business process may be needed to download Slow Query Log data in support of your data retention requirements.

Log Format


Slow Query Log lines vary in structure and content.

Informational lines begin with #

Plain Text

When downloaded in plain text format, Slow Query Log data is as outputted by the database server.


When downloaded in JSON format, Slow Query Log data has this format for each line, incorporating the plain text format:


One JSON object is produced for each logical line from the original plain text log file.

JSON key order is not guaranteed.