Help Center/ Relational Database Service_RDS for MariaDB/ User Guide/ Problem Diagnosis and SQL Analysis/ Problem Diagnosis/ Viewing Storage Usage
Updated on 2025-06-24 GMT+08:00
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Viewing Storage Usage

DBA Assistant allows you to view the storage usage of your DB instance in real time to prevent full storage space.

Procedure

  1. Log in to the management console.
  2. Click in the upper left corner and select a region and a project.
  3. Click in the upper left corner of the page and choose Databases > Relational Database Service.
  4. On the Instances page, click the instance name to go to the Overview page.
  5. In the navigation pane, choose DBA Assistant > Real-Time Diagnosis.
  6. Click the Storage Analysis tab.

    • In the Overview area, view the storage usage, including the available storage space and total storage space.

      If the storage usage reaches 87% or higher, you can click Scale to scale up the storage. For details about constraints and billing, see Scaling Up Storage Space.

      Figure 1 Storage usage

      If the average daily increase in last week is 0 GB, the estimated available days of storage are unlimited and are not displayed.

    • In the Disk Space Distribution area, view the space distribution of your instance. For details, see Table 1.
      Figure 2 Disk space distribution

      If the total number of files in your disk space (including data space, binlog space, slow query log space, relay log space, audit log space, temporary space, and other space) exceeds 10,000, RDS will not collect information about the files or display disk space distribution and usages over time on the console. This prevents performance slowdowns caused by collecting statistics on too many files. If this happens, submit a service ticket.

      Table 1 Parameter description

      Parameter

      Description

      Data

      Disk space for storing user data

      Binlogs

      Disk space for storing binlogs

      Slow query logs

      Disk space for storing slow logs

      Relay logs

      Disk space for storing relay logs

      Audit logs

      Disk space for storing audit logs

      Temporary space

      Disk space for storing temporary files

      Other

      Disk space for storing files such as ib_buffer_pool, ib_doublewrite and error.log generated by the instance.

FAQ

Q: What can I do if the storage space of my DB instance is full?

A: Reduce the storage usage to below 87% so that the DB instance becomes available and data can be written to the instance. You can use either of the following methods to reduce the storage usage:
  • Scale up the storage space: Services are not interrupted during storage scale-up. You can also enable autoscaling. When the available storage of a DB instance drops to the threshold, autoscaling is triggered.
  • Reduce data: Delete useless historical data.
    1. If your instance becomes read-only, you need to submit a service ticket to cancel the read-only status first. If your instance is not in the read-only state, you can delete data directly.
    2. Check the top 50 databases and tables with large physical files and identify the historical table data that can be deleted. For details, see Viewing Top Databases and Tables by Physical File Size.
    3. To clear up space, you can optimize tables with a high fragmentation rate during off-peak hours.

      To delete data of an entire table, run DROP or TRUNCATE. To delete part of table data, run DELETE and OPTIMIZE TABLE.

  • If temporary files generated by sorting queries occupy too much storage space, optimize your SQL query statements.

    You can query slow query logs, and analyze and optimize the problematic SQL statements.

Parent topic: Problem Diagnosis