Help Center/ Relational Database Service/ User Guide/ Working with RDS for MySQL/ Problem Diagnosis and SQL Analysis/ Problem Diagnosis/ Managing Storage Capacity
Updated on 2025-11-11 GMT+08:00
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Managing Storage Capacity

Function Description

Data and log storage space and its changes significantly impact database performance. RDS for MySQL shows you the distribution and changes of used storage on the Storage Analysis page. It also provides storage autoscaling, intelligent tablespace diagnosis, and analysis of top 50 largest databases and tables.

Table 1 Functions

Function

Description

Related Operations

Overview

You can view storage usage, available storage, total storage, daily increase in the last week, and estimated available days of storage.

Viewing the Storage Overview

Tablespaces

It shows you tables with abnormal tablespace growth, tables without primary keys, and tables without indexes.

Tablespaces

Used Storage and Used Storage over Time

You can view the distribution of storage space and its changes over time.

Used Storage over Time

Top Databases and Tables

You can view the top 50 databases and tables by physical file size and identify the databases and tables with high usage based on storage space distribution.

Top Databases and Tables by Physical File Size
  1. Log in to the management console.
  2. Click in the upper left corner of the page and choose Databases > Relational Database Service.
  3. On the Instances page, click the target DB instance name.
  4. In the navigation pane, choose DBA Assistant > Real-Time Diagnosis and click the Storage Analysis tab.
  5. Check your storage usage. If the storage is insufficient, scale it up. Or you can enable storage autoscaling.

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

    • Data space: Disk space occupied by user data (including temporary table files and ib_logfile files generated by the database)
    • Binlogs: Disk space occupied by binlogs
    • Slow query logs: Disk space occupied by slow logs
    • Relay logs: Disk space occupied by relay logs
    • Audit logs: Disk space occupied by audit logs
    • Temporary space: Disk space occupied by temporary files
    • Other: Disk space occupied by files such as ibdata1, ib_buffer_pool, ib_doublewrite, and error.log, plus the reserved space (about 5% of the disk space) for OS

This function counts tables with abnormal tablespace growth, tables without primary keys, and tables without indexes.

  1. Click the Storage Analysis tab to view abnormal tables.
  2. Click next to Auto Diagnosis. In the displayed dialog box, configure the daily tablespace increase limit and click OK.

You can check the storage usage over time of your instance.

You can view the top 50 databases and tables by physical file size and identify the databases and tables with high usage based on storage space distribution.

  • Physical file sizes are precisely recorded, but other fields' values are estimated. If there is a large gap between a file size and another field, run ANALYZE TABLE on the table.
  • A database or table whose name contains special characters, including slashes (/) and #p#p, is not counted.
  • Top databases and tables are available only in RDS for MySQL 5.7 and 8.0.
  • If your instance's memory usage is greater than 85% or it has more than 50,000 tables, RDS will not collect related information. This prevents performance slowdowns caused by collecting statistics on too many databases and tables.

Click View Chart to view data volume changes in the last 7 days, last 30 days, or a custom time period (spanning no more than 30 days).

Parent Topic: Problem Diagnosis