Managing MySQL Disk Space and Log Files in DataHub

ingestion
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To reduce the overall storage consumption of MySQL binary logs, rather than just breaking them into smaller chunks, you can implement several strategies:

  1. Expire Old Logs: Use the expire_logs_days parameter to automatically delete binary logs older than a specified number of days. This is the most effective way to reduce storage usage by removing logs that are no longer needed.

    [mysqld]
expire_logs_days = 7

    This configuration will ensure that binary logs older than 7 days are automatically purged, freeing up disk space.

  2. Manual Purging: If you need to immediately free up space, you can manually purge binary logs that are no longer needed using the PURGE BINARY LOGS command.

    PURGE BINARY LOGS BEFORE '2024-01-01 00:00:00';

    This command will delete all binary logs created before the specified date.

  3. Disable Binary Logging: If binary logging is not required for your setup (e.g., you are not using replication or point-in-time recovery), you can disable it to prevent logs from being generated.

    [mysqld]
skip-log-bin

    Note: Disabling binary logging will prevent you from using certain features like replication and point-in-time recovery.

  4. Optimize Log Usage: If you need binary logs but want to minimize their size, consider optimizing the operations that generate them. For example, batch updates or inserts can reduce the number of log entries compared to individual operations.

  5. Monitor and Adjust: Regularly monitor the size of your binary logs and adjust the expire_logs_days setting as needed based on your storage capacity and requirements.

By implementing these strategies, you can effectively manage and reduce the storage consumption of MySQL binary logs. Would you like more detailed guidance on any specific part of this process?

Sources:

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<@U06TM7M40RK> if I use skip-log-bin, can I still see the log when the ingestion runs?

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Using the skip-log-bin option in MySQL disables binary logging, which means that the binary logs will not be generated. However, this does not affect other types of logs, such as the general query log or the slow query log, which can still be used to monitor and review SQL queries executed during ingestion.

Here’s how you can still monitor logs when skip-log-bin is enabled:

  1. General Query Log: This log records all SQL queries received by the server. You can enable it to see every query executed, but be aware that it can generate a large amount of data and impact performance.

    [mysqld]
general_log = 1
general_log_file = /var/log/mysql/general.log

  2. Slow Query Log: This log captures queries that take longer than a specified time to execute. It’s useful for identifying performance bottlenecks.

    [mysqld]
slow_query_log = 1
slow_query_log_file = /var/log/mysql/slow.log
long_query_time = 2

  3. Error Log: This log records any errors that occur during MySQL operations, which can be useful for troubleshooting.

    [mysqld]
log_error = /var/log/mysql/error.log

By enabling these logs, you can still monitor and review the SQL queries and operations performed during ingestion, even if binary logging is disabled with skip-log-bin. Just ensure that the log files are managed properly to prevent them from consuming excessive disk space.

Would you like more detailed guidance on configuring these logs? :+1: 0 button :-1: 0 button :bulb: Hint: Mention @runllm in the thread for followups.

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Hi :slight_smile: ! Did this interaction resolve your issue or do you still require assistance ?

Please tag @ RunLLM if you still need further assistance !

Or tag @Datahub Community Support if you require a person to take a look :slight_smile:

Hope this helps ! ><