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Full Storage of RDS for SQL Server Instances

Updated on 2024-10-14 GMT+08:00

When the storage usage of an instance reaches 97% or higher, RDS sets the instance to read-only to protect the disk from becoming abnormal. The instance status changes to Storage full.

Possible Causes

  • Service volume increase
  • Too large LDF files in some databases
  • Temporary database (tempdb) occupying too much storage

Solution

  • Scale up the storage.
    1. In the instance list, choose More > Scale Storage Space.
    2. On the displayed page, the system determines the minimum space required.
      Figure 1 Scaling up storage space
    3. After the scale-up is successful, check that the instance status becomes Available.
      Figure 2 Checking the instance status
  • If the full storage is caused by too large LDF files in some databases, shrink the databases.

    For details, see Shrinking Databases.

    Figure 3 Checking the LDF file size
  • If the tempdb database occupies too much space, perform the following operations:
    1. Query the tempdb database size.
      SELECT name AS FileName,
      size*1.0/128 AS FileSizeInMB,
      CASE max_size
      WHEN 0 THEN 'Autogrowth is off.'
      WHEN -1 THEN 'Autogrowth is on.'
      ELSE 'Log file grows to a maximum size of 2 TB.'
      END,
      growth AS 'GrowthValue',
      'GrowthIncrement' =
      CASE
      WHEN growth = 0 THEN 'Size is fixed.'
      WHEN growth > 0 AND is_percent_growth = 0
      THEN 'Growth value is in 8-KB pages.'
      ELSE 'Growth value is a percentage.'
      END
      FROM tempdb.sys.database_files;
    2. Shrink the tempdb database by referring to Shrinking Databases. If the tempdb database is frequently used, the storage usage cannot be effectively reduced.
    3. In the instance list, choose More > Reboot to reboot the instance. In this way, the free space of tempdb will be released.
      After the reboot, the instance status becomes Available.
      NOTICE:

      An instance reboot can resolve the full storage problem caused by tempdb. But if the full storage is caused by large LDF files in some databases, a reboot does not work. It may cause databases with large transaction logs to enter the inRecovery state, in which the databases cannot be accessed for a long time. For higher security, you are advised to scale up storage.

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